av_register_all()
av_register_all()的作用是：初始化所有组件，只有调用了该函数，才能使用复用器和编解码器，该接口内部的调用为：
(3). REGISTER_DECODER()：
(1).avcodec_register_all()，该接口内部执行步骤：
- 注册硬件加速器：REGISTER_HWACCEL()
- 注册音视频编码器：REGISTER_ENCODER()
- 注册音视频解码器：REGISTER_DECODER()
- 打包注册：REGISTER_ENCDEC()
- 注册解析器：REGISTER_PARSER()
(2).执行复用器和解复用器的注册：
- 注册复用器：REGISTER_MUXER()
- 注册解复用器：REGISTER_DEMUXER()
- 打包注册：REGISTER_MUXDEMUX()
代码如下：
void av_register_all(void)
{
static int initialized;
if (initialized)
return;
avcodec_register_all();
/* (de)muxers */
REGISTER_MUXER (A64, a64);
REGISTER_DEMUXER (AA, aa);
REGISTER_DEMUXER (AAC, aac);
REGISTER_MUXDEMUX(AC3, ac3);
REGISTER_DEMUXER (ACM, acm);
REGISTER_DEMUXER (ACT, act);
REGISTER_DEMUXER (ADF, adf);
REGISTER_DEMUXER (ADP, adp);
REGISTER_DEMUXER (ADS, ads);
REGISTER_MUXER (ADTS, adts);
REGISTER_MUXDEMUX(ADX, adx);
REGISTER_DEMUXER (AEA, aea);
REGISTER_DEMUXER (AFC, afc);
REGISTER_MUXDEMUX(AIFF, aiff);
REGISTER_DEMUXER (AIX, aix);
REGISTER_MUXDEMUX(AMR, amr);
REGISTER_DEMUXER (ANM, anm);
REGISTER_DEMUXER (APC, apc);
REGISTER_DEMUXER (APE, ape);
REGISTER_MUXDEMUX(APNG, apng);
REGISTER_DEMUXER (AQTITLE, aqtitle);
REGISTER_MUXDEMUX(ASF, asf);
REGISTER_DEMUXER (ASF_O, asf_o);
REGISTER_MUXDEMUX(ASS, ass);
REGISTER_MUXDEMUX(AST, ast);
REGISTER_MUXER (ASF_STREAM, asf_stream);
REGISTER_MUXDEMUX(AU, au);
REGISTER_MUXDEMUX(AVI, avi);
REGISTER_DEMUXER (AVISYNTH, avisynth);
REGISTER_MUXER (AVM2, avm2);
REGISTER_DEMUXER (AVR, avr);
REGISTER_DEMUXER (AVS, avs);
REGISTER_DEMUXER (BETHSOFTVID, bethsoftvid);
REGISTER_DEMUXER (BFI, bfi);
REGISTER_DEMUXER (BINTEXT, bintext);
REGISTER_DEMUXER (BINK, bink);
REGISTER_MUXDEMUX(BIT, bit);
REGISTER_DEMUXER (BMV, bmv);
REGISTER_DEMUXER (BFSTM, bfstm);
REGISTER_DEMUXER (BRSTM, brstm);
REGISTER_DEMUXER (BOA, boa);
REGISTER_DEMUXER (C93, c93);
REGISTER_MUXDEMUX(CAF, caf);
REGISTER_MUXDEMUX(CAVSVIDEO, cavsvideo);
REGISTER_DEMUXER (CDG, cdg);
REGISTER_DEMUXER (CDXL, cdxl);
REGISTER_DEMUXER (CINE, cine);
REGISTER_DEMUXER (CONCAT, concat);
REGISTER_MUXER (CRC, crc);
REGISTER_MUXER (DASH, dash);
REGISTER_MUXDEMUX(DATA, data);
REGISTER_MUXDEMUX(DAUD, daud);
REGISTER_DEMUXER (DCSTR, dcstr);
REGISTER_DEMUXER (DFA, dfa);
REGISTER_MUXDEMUX(DIRAC, dirac);
REGISTER_MUXDEMUX(DNXHD, dnxhd);
REGISTER_DEMUXER (DSF, dsf);
REGISTER_DEMUXER (DSICIN, dsicin);
REGISTER_DEMUXER (DSS, dss);
REGISTER_MUXDEMUX(DTS, dts);
REGISTER_DEMUXER (DTSHD, dtshd);
REGISTER_MUXDEMUX(DV, dv);
REGISTER_DEMUXER (DVBSUB, dvbsub);
REGISTER_DEMUXER (DVBTXT, dvbtxt);
REGISTER_DEMUXER (DXA, dxa);
REGISTER_DEMUXER (EA, ea);
REGISTER_DEMUXER (EA_CDATA, ea_cdata);
REGISTER_MUXDEMUX(EAC3, eac3);
REGISTER_DEMUXER (EPAF, epaf);
REGISTER_MUXER (F4V, f4v);
REGISTER_MUXDEMUX(FFM, ffm);
REGISTER_MUXDEMUX(FFMETADATA, ffmetadata);
REGISTER_MUXER (FIFO, fifo);
REGISTER_MUXDEMUX(FILMSTRIP, filmstrip);
REGISTER_MUXDEMUX(FLAC, flac);
REGISTER_DEMUXER (FLIC, flic);
REGISTER_MUXDEMUX(FLV, flv);
REGISTER_DEMUXER (LIVE_FLV, live_flv);
REGISTER_DEMUXER (FOURXM, fourxm);
REGISTER_MUXER (FRAMECRC, framecrc);
REGISTER_MUXER (FRAMEHASH, framehash);
REGISTER_MUXER (FRAMEMD5, framemd5);
REGISTER_DEMUXER (FRM, frm);
REGISTER_DEMUXER (FSB, fsb);
REGISTER_MUXDEMUX(G722, g722);
REGISTER_MUXDEMUX(G723_1, g723_1);
REGISTER_DEMUXER (G729, g729);
REGISTER_DEMUXER (GENH, genh);
REGISTER_MUXDEMUX(GIF, gif);
REGISTER_MUXDEMUX(GSM, gsm);
REGISTER_MUXDEMUX(GXF, gxf);
REGISTER_MUXDEMUX(H261, h261);
REGISTER_MUXDEMUX(H263, h263);
REGISTER_MUXDEMUX(H264, h264);
REGISTER_MUXER (HASH, hash);
REGISTER_MUXER (HDS, hds);
REGISTER_MUXDEMUX(HEVC, hevc);
REGISTER_MUXDEMUX(HLS, hls);
REGISTER_DEMUXER (HNM, hnm);
REGISTER_MUXDEMUX(ICO, ico);
REGISTER_DEMUXER (IDCIN, idcin);
REGISTER_DEMUXER (IDF, idf);
REGISTER_DEMUXER (IFF, iff);
REGISTER_MUXDEMUX(ILBC, ilbc);
REGISTER_MUXDEMUX(IMAGE2, image2);
REGISTER_MUXDEMUX(IMAGE2PIPE, image2pipe);
REGISTER_DEMUXER (IMAGE2_ALIAS_PIX, image2_alias_pix);
REGISTER_DEMUXER (IMAGE2_BRENDER_PIX, image2_brender_pix);
REGISTER_DEMUXER (INGENIENT, ingenient);
REGISTER_DEMUXER (IPMOVIE, ipmovie);
REGISTER_MUXER (IPOD, ipod);
REGISTER_MUXDEMUX(IRCAM, ircam);
REGISTER_MUXER (ISMV, ismv);
REGISTER_DEMUXER (ISS, iss);
REGISTER_DEMUXER (IV8, iv8);
REGISTER_MUXDEMUX(IVF, ivf);
REGISTER_DEMUXER (IVR, ivr);
REGISTER_MUXDEMUX(JACOSUB, jacosub);
REGISTER_DEMUXER (JV, jv);
REGISTER_MUXER (LATM, latm);
REGISTER_DEMUXER (LMLM4, lmlm4);
REGISTER_DEMUXER (LOAS, loas);
REGISTER_MUXDEMUX(LRC, lrc);
REGISTER_DEMUXER (LVF, lvf);
REGISTER_DEMUXER (LXF, lxf);
REGISTER_MUXDEMUX(M4V, m4v);
REGISTER_MUXER (MD5, md5);
REGISTER_MUXDEMUX(MATROSKA, matroska);
REGISTER_MUXER (MATROSKA_AUDIO, matroska_audio);
REGISTER_DEMUXER (MGSTS, mgsts);
REGISTER_MUXDEMUX(MICRODVD, microdvd);
REGISTER_MUXDEMUX(MJPEG, mjpeg);
REGISTER_MUXDEMUX(MLP, mlp);
REGISTER_DEMUXER (MLV, mlv);
REGISTER_DEMUXER (MM, mm);
REGISTER_MUXDEMUX(MMF, mmf);
REGISTER_MUXDEMUX(MOV, mov);
REGISTER_MUXER (MP2, mp2);
REGISTER_MUXDEMUX(MP3, mp3);
REGISTER_MUXER (MP4, mp4);
REGISTER_DEMUXER (MPC, mpc);
REGISTER_DEMUXER (MPC8, mpc8);
REGISTER_MUXER (MPEG1SYSTEM, mpeg1system);
REGISTER_MUXER (MPEG1VCD, mpeg1vcd);
REGISTER_MUXER (MPEG1VIDEO, mpeg1video);
REGISTER_MUXER (MPEG2DVD, mpeg2dvd);
REGISTER_MUXER (MPEG2SVCD, mpeg2svcd);
REGISTER_MUXER (MPEG2VIDEO, mpeg2video);
REGISTER_MUXER (MPEG2VOB, mpeg2vob);
REGISTER_DEMUXER (MPEGPS, mpegps);
REGISTER_MUXDEMUX(MPEGTS, mpegts);
REGISTER_DEMUXER (MPEGTSRAW, mpegtsraw);
REGISTER_DEMUXER (MPEGVIDEO, mpegvideo);
REGISTER_MUXDEMUX(MPJPEG, mpjpeg);
REGISTER_DEMUXER (MPL2, mpl2);
REGISTER_DEMUXER (MPSUB, mpsub);
REGISTER_DEMUXER (MSF, msf);
REGISTER_DEMUXER (MSNWC_TCP, msnwc_tcp);
REGISTER_DEMUXER (MTAF, mtaf);
REGISTER_DEMUXER (MTV, mtv);
REGISTER_DEMUXER (MUSX, musx);
REGISTER_DEMUXER (MV, mv);
REGISTER_DEMUXER (MVI, mvi);
REGISTER_MUXDEMUX(MXF, mxf);
REGISTER_MUXER (MXF_D10, mxf_d10);
REGISTER_MUXER (MXF_OPATOM, mxf_opatom);
REGISTER_DEMUXER (MXG, mxg);
REGISTER_DEMUXER (NC, nc);
REGISTER_DEMUXER (NISTSPHERE, nistsphere);
REGISTER_DEMUXER (NSV, nsv);
REGISTER_MUXER (NULL, null);
REGISTER_MUXDEMUX(NUT, nut);
REGISTER_DEMUXER (NUV, nuv);
REGISTER_MUXER (OGA, oga);
REGISTER_MUXDEMUX(OGG, ogg);
REGISTER_MUXER (OGV, ogv);
REGISTER_MUXDEMUX(OMA, oma);
REGISTER_MUXER (OPUS, opus);
REGISTER_DEMUXER (PAF, paf);
REGISTER_MUXDEMUX(PCM_ALAW, pcm_alaw);
REGISTER_MUXDEMUX(PCM_MULAW, pcm_mulaw);
REGISTER_MUXDEMUX(PCM_F64BE, pcm_f64be);
REGISTER_MUXDEMUX(PCM_F64LE, pcm_f64le);
REGISTER_MUXDEMUX(PCM_F32BE, pcm_f32be);
REGISTER_MUXDEMUX(PCM_F32LE, pcm_f32le);
REGISTER_MUXDEMUX(PCM_S32BE, pcm_s32be);
REGISTER_MUXDEMUX(PCM_S32LE, pcm_s32le);
REGISTER_MUXDEMUX(PCM_S24BE, pcm_s24be);
REGISTER_MUXDEMUX(PCM_S24LE, pcm_s24le);
REGISTER_MUXDEMUX(PCM_S16BE, pcm_s16be);
REGISTER_MUXDEMUX(PCM_S16LE, pcm_s16le);
REGISTER_MUXDEMUX(PCM_S8, pcm_s8);
REGISTER_MUXDEMUX(PCM_U32BE, pcm_u32be);
REGISTER_MUXDEMUX(PCM_U32LE, pcm_u32le);
REGISTER_MUXDEMUX(PCM_U24BE, pcm_u24be);
REGISTER_MUXDEMUX(PCM_U24LE, pcm_u24le);
REGISTER_MUXDEMUX(PCM_U16BE, pcm_u16be);
REGISTER_MUXDEMUX(PCM_U16LE, pcm_u16le);
REGISTER_MUXDEMUX(PCM_U8, pcm_u8);
REGISTER_DEMUXER (PJS, pjs);
REGISTER_DEMUXER (PMP, pmp);
REGISTER_MUXER (PSP, psp);
REGISTER_DEMUXER (PVA, pva);
REGISTER_DEMUXER (PVF, pvf);
REGISTER_DEMUXER (QCP, qcp);
REGISTER_DEMUXER (R3D, r3d);
REGISTER_MUXDEMUX(RAWVIDEO, rawvideo);
REGISTER_DEMUXER (REALTEXT, realtext);
REGISTER_DEMUXER (REDSPARK, redspark);
REGISTER_DEMUXER (RL2, rl2);
REGISTER_MUXDEMUX(RM, rm);
REGISTER_MUXDEMUX(ROQ, roq);
REGISTER_DEMUXER (RPL, rpl);
REGISTER_DEMUXER (RSD, rsd);
REGISTER_MUXDEMUX(RSO, rso);
REGISTER_MUXDEMUX(RTP, rtp);
REGISTER_MUXER (RTP_MPEGTS, rtp_mpegts);
REGISTER_MUXDEMUX(RTSP, rtsp);
REGISTER_DEMUXER (SAMI, sami);
REGISTER_MUXDEMUX(SAP, sap);
REGISTER_DEMUXER (SBG, sbg);
REGISTER_DEMUXER (SDP, sdp);
REGISTER_DEMUXER (SDR2, sdr2);
#if CONFIG_RTPDEC
ff_register_rtp_dynamic_payload_handlers();
ff_register_rdt_dynamic_payload_handlers();
#endif
REGISTER_DEMUXER (SEGAFILM, segafilm);
REGISTER_MUXER (SEGMENT, segment);
REGISTER_MUXER (SEGMENT, stream_segment);
REGISTER_DEMUXER (SHORTEN, shorten);
REGISTER_DEMUXER (SIFF, siff);
REGISTER_MUXER (SINGLEJPEG, singlejpeg);
REGISTER_DEMUXER (SLN, sln);
REGISTER_DEMUXER (SMACKER, smacker);
REGISTER_MUXDEMUX(SMJPEG, smjpeg);
REGISTER_MUXER (SMOOTHSTREAMING, smoothstreaming);
REGISTER_DEMUXER (SMUSH, smush);
REGISTER_DEMUXER (SOL, sol);
REGISTER_MUXDEMUX(SOX, sox);
REGISTER_MUXER (SPX, spx);
REGISTER_MUXDEMUX(SPDIF, spdif);
REGISTER_MUXDEMUX(SRT, srt);
REGISTER_DEMUXER (STR, str);
REGISTER_DEMUXER (STL, stl);
REGISTER_DEMUXER (SUBVIEWER1, subviewer1);
REGISTER_DEMUXER (SUBVIEWER, subviewer);
REGISTER_DEMUXER (SUP, sup);
REGISTER_DEMUXER (SVAG, svag);
REGISTER_MUXDEMUX(SWF, swf);
REGISTER_DEMUXER (TAK, tak);
REGISTER_MUXER (TEE, tee);
REGISTER_DEMUXER (TEDCAPTIONS, tedcaptions);
REGISTER_MUXER (TG2, tg2);
REGISTER_MUXER (TGP, tgp);
REGISTER_DEMUXER (THP, thp);
REGISTER_DEMUXER (THREEDOSTR, threedostr);
REGISTER_DEMUXER (TIERTEXSEQ, tiertexseq);
REGISTER_MUXER (MKVTIMESTAMP_V2, mkvtimestamp_v2);
REGISTER_DEMUXER (TMV, tmv);
REGISTER_MUXDEMUX(TRUEHD, truehd);
REGISTER_MUXDEMUX(TTA, tta);
REGISTER_DEMUXER (TXD, txd);
REGISTER_DEMUXER (TTY, tty);
REGISTER_MUXER (UNCODEDFRAMECRC, uncodedframecrc);
REGISTER_DEMUXER (V210, v210);
REGISTER_DEMUXER (V210X, v210x);
REGISTER_DEMUXER (VAG, vag);
REGISTER_MUXDEMUX(VC1, vc1);
REGISTER_MUXDEMUX(VC1T, vc1t);
REGISTER_DEMUXER (VIVO, vivo);
REGISTER_DEMUXER (VMD, vmd);
REGISTER_DEMUXER (VOBSUB, vobsub);
REGISTER_MUXDEMUX(VOC, voc);
REGISTER_DEMUXER (VPK, vpk);
REGISTER_DEMUXER (VPLAYER, vplayer);
REGISTER_DEMUXER (VQF, vqf);
REGISTER_MUXDEMUX(W64, w64);
REGISTER_MUXDEMUX(WAV, wav);
REGISTER_DEMUXER (WC3, wc3);
REGISTER_MUXER (WEBM, webm);
REGISTER_MUXDEMUX(WEBM_DASH_MANIFEST, webm_dash_manifest);
REGISTER_MUXER (WEBM_CHUNK, webm_chunk);
REGISTER_MUXER (WEBP, webp);
REGISTER_MUXDEMUX(WEBVTT, webvtt);
REGISTER_DEMUXER (WSAUD, wsaud);
REGISTER_DEMUXER (WSD, wsd);
REGISTER_DEMUXER (WSVQA, wsvqa);
REGISTER_MUXDEMUX(WTV, wtv);
REGISTER_DEMUXER (WVE, wve);
REGISTER_MUXDEMUX(WV, wv);
REGISTER_DEMUXER (XA, xa);
REGISTER_DEMUXER (XBIN, xbin);
REGISTER_DEMUXER (XMV, xmv);
REGISTER_DEMUXER (XVAG, xvag);
REGISTER_DEMUXER (XWMA, xwma);
REGISTER_DEMUXER (YOP, yop);
REGISTER_MUXDEMUX(YUV4MPEGPIPE, yuv4mpegpipe);
/* image demuxers */
REGISTER_DEMUXER (IMAGE_BMP_PIPE, image_bmp_pipe);
REGISTER_DEMUXER (IMAGE_DDS_PIPE, image_dds_pipe);
REGISTER_DEMUXER (IMAGE_DPX_PIPE, image_dpx_pipe);
REGISTER_DEMUXER (IMAGE_EXR_PIPE, image_exr_pipe);
REGISTER_DEMUXER (IMAGE_J2K_PIPE, image_j2k_pipe);
REGISTER_DEMUXER (IMAGE_JPEG_PIPE, image_jpeg_pipe);
REGISTER_DEMUXER (IMAGE_JPEGLS_PIPE, image_jpegls_pipe);
REGISTER_DEMUXER (IMAGE_PAM_PIPE, image_pam_pipe);
REGISTER_DEMUXER (IMAGE_PBM_PIPE, image_pbm_pipe);
REGISTER_DEMUXER (IMAGE_PCX_PIPE, image_pcx_pipe);
REGISTER_DEMUXER (IMAGE_PGMYUV_PIPE, image_pgmyuv_pipe);
REGISTER_DEMUXER (IMAGE_PGM_PIPE, image_pgm_pipe);
REGISTER_DEMUXER (IMAGE_PICTOR_PIPE, image_pictor_pipe);
REGISTER_DEMUXER (IMAGE_PNG_PIPE, image_png_pipe);
REGISTER_DEMUXER (IMAGE_PPM_PIPE, image_ppm_pipe);
REGISTER_DEMUXER (IMAGE_QDRAW_PIPE, image_qdraw_pipe);
REGISTER_DEMUXER (IMAGE_SGI_PIPE, image_sgi_pipe);
REGISTER_DEMUXER (IMAGE_SUNRAST_PIPE, image_sunrast_pipe);
REGISTER_DEMUXER (IMAGE_TIFF_PIPE, image_tiff_pipe);
REGISTER_DEMUXER (IMAGE_WEBP_PIPE, image_webp_pipe);
/* external libraries */
REGISTER_MUXER (CHROMAPRINT, chromaprint);
REGISTER_DEMUXER (LIBGME, libgme);
REGISTER_DEMUXER (LIBMODPLUG, libmodplug);
REGISTER_MUXDEMUX(LIBNUT, libnut);
REGISTER_DEMUXER (LIBOPENMPT, libopenmpt);
initialized = 1;
}另外，avcodec_register_all()的代码如下：
void avcodec_register_all(void)
{
static int initialized;
if (initialized)
return;
initialized = 1;
/* hardware accelerators */
REGISTER_HWACCEL(H263_CUVID, h263_cuvid);
REGISTER_HWACCEL(H263_VAAPI, h263_vaapi);
REGISTER_HWACCEL(H263_VIDEOTOOLBOX, h263_videotoolbox);
REGISTER_HWACCEL(H264_CUVID, h264_cuvid);
REGISTER_HWACCEL(H264_D3D11VA, h264_d3d11va);
REGISTER_HWACCEL(H264_DXVA2, h264_dxva2);
REGISTER_HWACCEL(H264_MEDIACODEC, h264_mediacodec);
REGISTER_HWACCEL(H264_MMAL, h264_mmal);
REGISTER_HWACCEL(H264_QSV, h264_qsv);
REGISTER_HWACCEL(H264_VAAPI, h264_vaapi);
REGISTER_HWACCEL(H264_VDA, h264_vda);
REGISTER_HWACCEL(H264_VDA_OLD, h264_vda_old);
REGISTER_HWACCEL(H264_VDPAU, h264_vdpau);
REGISTER_HWACCEL(H264_VIDEOTOOLBOX, h264_videotoolbox);
REGISTER_HWACCEL(HEVC_CUVID, hevc_cuvid);
REGISTER_HWACCEL(HEVC_D3D11VA, hevc_d3d11va);
REGISTER_HWACCEL(HEVC_DXVA2, hevc_dxva2);
REGISTER_HWACCEL(HEVC_MEDIACODEC, hevc_mediacodec);
REGISTER_HWACCEL(HEVC_QSV, hevc_qsv);
REGISTER_HWACCEL(HEVC_VAAPI, hevc_vaapi);
REGISTER_HWACCEL(HEVC_VDPAU, hevc_vdpau);
REGISTER_HWACCEL(MJPEG_CUVID, mjpeg_cuvid);
REGISTER_HWACCEL(MPEG1_CUVID, mpeg1_cuvid);
REGISTER_HWACCEL(MPEG1_XVMC, mpeg1_xvmc);
REGISTER_HWACCEL(MPEG1_VDPAU, mpeg1_vdpau);
REGISTER_HWACCEL(MPEG1_VIDEOTOOLBOX, mpeg1_videotoolbox);
REGISTER_HWACCEL(MPEG2_CUVID, mpeg2_cuvid);
REGISTER_HWACCEL(MPEG2_XVMC, mpeg2_xvmc);
REGISTER_HWACCEL(MPEG2_D3D11VA, mpeg2_d3d11va);
REGISTER_HWACCEL(MPEG2_DXVA2, mpeg2_dxva2);
REGISTER_HWACCEL(MPEG2_MMAL, mpeg2_mmal);
REGISTER_HWACCEL(MPEG2_QSV, mpeg2_qsv);
REGISTER_HWACCEL(MPEG2_VAAPI, mpeg2_vaapi);
REGISTER_HWACCEL(MPEG2_VDPAU, mpeg2_vdpau);
REGISTER_HWACCEL(MPEG2_VIDEOTOOLBOX, mpeg2_videotoolbox);
REGISTER_HWACCEL(MPEG4_CUVID, mpeg4_cuvid);
REGISTER_HWACCEL(MPEG4_MEDIACODEC, mpeg4_mediacodec);
REGISTER_HWACCEL(MPEG4_MMAL, mpeg4_mmal);
REGISTER_HWACCEL(MPEG4_VAAPI, mpeg4_vaapi);
REGISTER_HWACCEL(MPEG4_VDPAU, mpeg4_vdpau);
REGISTER_HWACCEL(MPEG4_VIDEOTOOLBOX, mpeg4_videotoolbox);
REGISTER_HWACCEL(VC1_CUVID, vc1_cuvid);
REGISTER_HWACCEL(VC1_D3D11VA, vc1_d3d11va);
REGISTER_HWACCEL(VC1_DXVA2, vc1_dxva2);
REGISTER_HWACCEL(VC1_VAAPI, vc1_vaapi);
REGISTER_HWACCEL(VC1_VDPAU, vc1_vdpau);
REGISTER_HWACCEL(VC1_MMAL, vc1_mmal);
REGISTER_HWACCEL(VC1_QSV, vc1_qsv);
REGISTER_HWACCEL(VP8_CUVID, vp8_cuvid);
REGISTER_HWACCEL(VP8_MEDIACODEC, vp8_mediacodec);
REGISTER_HWACCEL(VP9_CUVID, vp9_cuvid);
REGISTER_HWACCEL(VP9_D3D11VA, vp9_d3d11va);
REGISTER_HWACCEL(VP9_DXVA2, vp9_dxva2);
REGISTER_HWACCEL(VP9_MEDIACODEC, vp9_mediacodec);
REGISTER_HWACCEL(VP9_VAAPI, vp9_vaapi);
REGISTER_HWACCEL(WMV3_D3D11VA, wmv3_d3d11va);
REGISTER_HWACCEL(WMV3_DXVA2, wmv3_dxva2);
REGISTER_HWACCEL(WMV3_VAAPI, wmv3_vaapi);
REGISTER_HWACCEL(WMV3_VDPAU, wmv3_vdpau);
/* video codecs */
REGISTER_ENCODER(A64MULTI, a64multi);
REGISTER_ENCODER(A64MULTI5, a64multi5);
REGISTER_DECODER(AASC, aasc);
REGISTER_DECODER(AIC, aic);
REGISTER_ENCDEC (ALIAS_PIX, alias_pix);
REGISTER_ENCDEC (AMV, amv);
REGISTER_DECODER(ANM, anm);
REGISTER_DECODER(ANSI, ansi);
REGISTER_ENCDEC (APNG, apng);
REGISTER_ENCDEC (ASV1, asv1);
REGISTER_ENCDEC (ASV2, asv2);
REGISTER_DECODER(AURA, aura);
REGISTER_DECODER(AURA2, aura2);
REGISTER_ENCDEC (AVRP, avrp);
REGISTER_DECODER(AVRN, avrn);
REGISTER_DECODER(AVS, avs);
REGISTER_ENCDEC (AVUI, avui);
REGISTER_ENCDEC (AYUV, ayuv);
REGISTER_DECODER(BETHSOFTVID, bethsoftvid);
REGISTER_DECODER(BFI, bfi);
REGISTER_DECODER(BINK, bink);
REGISTER_ENCDEC (BMP, bmp);
REGISTER_DECODER(BMV_VIDEO, bmv_video);
REGISTER_DECODER(BRENDER_PIX, brender_pix);
REGISTER_DECODER(C93, c93);
REGISTER_DECODER(CAVS, cavs);
REGISTER_DECODER(CDGRAPHICS, cdgraphics);
REGISTER_DECODER(CDXL, cdxl);
REGISTER_DECODER(CFHD, cfhd);
REGISTER_ENCDEC (CINEPAK, cinepak);
REGISTER_ENCDEC (CLJR, cljr);
REGISTER_DECODER(CLLC, cllc);
REGISTER_ENCDEC (COMFORTNOISE, comfortnoise);
REGISTER_DECODER(CPIA, cpia);
REGISTER_DECODER(CSCD, cscd);
REGISTER_DECODER(CYUV, cyuv);
REGISTER_DECODER(DDS, dds);
REGISTER_DECODER(DFA, dfa);
REGISTER_DECODER(DIRAC, dirac);
REGISTER_ENCDEC (DNXHD, dnxhd);
REGISTER_ENCDEC (DPX, dpx);
REGISTER_DECODER(DSICINVIDEO, dsicinvideo);
REGISTER_DECODER(DVAUDIO, dvaudio);
REGISTER_ENCDEC (DVVIDEO, dvvideo);
REGISTER_DECODER(DXA, dxa);
REGISTER_DECODER(DXTORY, dxtory);
REGISTER_DECODER(DXV, dxv);
REGISTER_DECODER(EACMV, eacmv);
REGISTER_DECODER(EAMAD, eamad);
REGISTER_DECODER(EATGQ, eatgq);
REGISTER_DECODER(EATGV, eatgv);
REGISTER_DECODER(EATQI, eatqi);
REGISTER_DECODER(EIGHTBPS, eightbps);
REGISTER_DECODER(EIGHTSVX_EXP, eightsvx_exp);
REGISTER_DECODER(EIGHTSVX_FIB, eightsvx_fib);
REGISTER_DECODER(ESCAPE124, escape124);
REGISTER_DECODER(ESCAPE130, escape130);
REGISTER_DECODER(EXR, exr);
REGISTER_ENCDEC (FFV1, ffv1);
REGISTER_ENCDEC (FFVHUFF, ffvhuff);
REGISTER_DECODER(FIC, fic);
REGISTER_ENCDEC (FLASHSV, flashsv);
REGISTER_ENCDEC (FLASHSV2, flashsv2);
REGISTER_DECODER(FLIC, flic);
REGISTER_ENCDEC (FLV, flv);
REGISTER_DECODER(FOURXM, fourxm);
REGISTER_DECODER(FRAPS, fraps);
REGISTER_DECODER(FRWU, frwu);
REGISTER_DECODER(G2M, g2m);
REGISTER_ENCDEC (GIF, gif);
REGISTER_ENCDEC (H261, h261);
REGISTER_ENCDEC (H263, h263);
REGISTER_DECODER(H263I, h263i);
REGISTER_ENCDEC (H263P, h263p);
REGISTER_DECODER(H264, h264);
REGISTER_DECODER(H264_CRYSTALHD, h264_crystalhd);
REGISTER_DECODER(H264_MEDIACODEC, h264_mediacodec);
REGISTER_DECODER(H264_MMAL, h264_mmal);
REGISTER_DECODER(H264_QSV, h264_qsv);
REGISTER_DECODER(H264_VDA, h264_vda);
#if FF_API_VDPAU
REGISTER_DECODER(H264_VDPAU, h264_vdpau);
#endif
REGISTER_ENCDEC (HAP, hap);
REGISTER_DECODER(HEVC, hevc);
REGISTER_DECODER(HEVC_QSV, hevc_qsv);
REGISTER_DECODER(HNM4_VIDEO, hnm4_video);
REGISTER_DECODER(HQ_HQA, hq_hqa);
REGISTER_DECODER(HQX, hqx);
REGISTER_ENCDEC (HUFFYUV, huffyuv);
REGISTER_DECODER(IDCIN, idcin);
REGISTER_DECODER(IFF_ILBM, iff_ilbm);
REGISTER_DECODER(INDEO2, indeo2);
REGISTER_DECODER(INDEO3, indeo3);
REGISTER_DECODER(INDEO4, indeo4);
REGISTER_DECODER(INDEO5, indeo5);
REGISTER_DECODER(INTERPLAY_VIDEO, interplay_video);
REGISTER_ENCDEC (JPEG2000, jpeg2000);
REGISTER_ENCDEC (JPEGLS, jpegls);
REGISTER_DECODER(JV, jv);
REGISTER_DECODER(KGV1, kgv1);
REGISTER_DECODER(KMVC, kmvc);
REGISTER_DECODER(LAGARITH, lagarith);
REGISTER_ENCODER(LJPEG, ljpeg);
REGISTER_DECODER(LOCO, loco);
REGISTER_DECODER(M101, m101);
REGISTER_DECODER(MAGICYUV, magicyuv);
REGISTER_DECODER(MDEC, mdec);
REGISTER_DECODER(MIMIC, mimic);
REGISTER_ENCDEC (MJPEG, mjpeg);
REGISTER_DECODER(MJPEGB, mjpegb);
REGISTER_DECODER(MMVIDEO, mmvideo);
REGISTER_DECODER(MOTIONPIXELS, motionpixels);
#if FF_API_XVMC
REGISTER_DECODER(MPEG_XVMC, mpeg_xvmc);
#endif /* FF_API_XVMC */
REGISTER_ENCDEC (MPEG1VIDEO, mpeg1video);
REGISTER_ENCDEC (MPEG2VIDEO, mpeg2video);
REGISTER_ENCDEC (MPEG4, mpeg4);
REGISTER_DECODER(MPEG4_CRYSTALHD, mpeg4_crystalhd);
REGISTER_DECODER(MPEG4_MMAL, mpeg4_mmal);
#if FF_API_VDPAU
REGISTER_DECODER(MPEG4_VDPAU, mpeg4_vdpau);
#endif
REGISTER_DECODER(MPEGVIDEO, mpegvideo);
#if FF_API_VDPAU
REGISTER_DECODER(MPEG_VDPAU, mpeg_vdpau);
REGISTER_DECODER(MPEG1_VDPAU, mpeg1_vdpau);
#endif
REGISTER_DECODER(MPEG2_MMAL, mpeg2_mmal);
REGISTER_DECODER(MPEG2_CRYSTALHD, mpeg2_crystalhd);
REGISTER_DECODER(MPEG2_QSV, mpeg2_qsv);
REGISTER_DECODER(MSA1, msa1);
REGISTER_DECODER(MSMPEG4_CRYSTALHD, msmpeg4_crystalhd);
REGISTER_DECODER(MSMPEG4V1, msmpeg4v1);
REGISTER_ENCDEC (MSMPEG4V2, msmpeg4v2);
REGISTER_ENCDEC (MSMPEG4V3, msmpeg4v3);
REGISTER_DECODER(MSRLE, msrle);
REGISTER_DECODER(MSS1, mss1);
REGISTER_DECODER(MSS2, mss2);
REGISTER_ENCDEC (MSVIDEO1, msvideo1);
REGISTER_DECODER(MSZH, mszh);
REGISTER_DECODER(MTS2, mts2);
REGISTER_DECODER(MVC1, mvc1);
REGISTER_DECODER(MVC2, mvc2);
REGISTER_DECODER(MXPEG, mxpeg);
REGISTER_DECODER(NUV, nuv);
REGISTER_DECODER(PAF_VIDEO, paf_video);
REGISTER_ENCDEC (PAM, pam);
REGISTER_ENCDEC (PBM, pbm);
REGISTER_ENCDEC (PCX, pcx);
REGISTER_ENCDEC (PGM, pgm);
REGISTER_ENCDEC (PGMYUV, pgmyuv);
REGISTER_DECODER(PICTOR, pictor);
REGISTER_ENCDEC (PNG, png);
REGISTER_ENCDEC (PPM, ppm);
REGISTER_ENCDEC (PRORES, prores);
REGISTER_ENCODER(PRORES_AW, prores_aw);
REGISTER_ENCODER(PRORES_KS, prores_ks);
REGISTER_DECODER(PRORES_LGPL, prores_lgpl);
REGISTER_DECODER(PTX, ptx);
REGISTER_DECODER(QDRAW, qdraw);
REGISTER_DECODER(QPEG, qpeg);
REGISTER_ENCDEC (QTRLE, qtrle);
REGISTER_ENCDEC (R10K, r10k);
REGISTER_ENCDEC (R210, r210);
REGISTER_ENCDEC (RAWVIDEO, rawvideo);
REGISTER_DECODER(RL2, rl2);
REGISTER_ENCDEC (ROQ, roq);
REGISTER_DECODER(RPZA, rpza);
REGISTER_DECODER(RSCC, rscc);
REGISTER_ENCDEC (RV10, rv10);
REGISTER_ENCDEC (RV20, rv20);
REGISTER_DECODER(RV30, rv30);
REGISTER_DECODER(RV40, rv40);
REGISTER_ENCDEC (S302M, s302m);
REGISTER_DECODER(SANM, sanm);
REGISTER_DECODER(SCREENPRESSO, screenpresso);
REGISTER_DECODER(SDX2_DPCM, sdx2_dpcm);
REGISTER_ENCDEC (SGI, sgi);
REGISTER_DECODER(SGIRLE, sgirle);
REGISTER_DECODER(SHEERVIDEO, sheervideo);
REGISTER_DECODER(SMACKER, smacker);
REGISTER_DECODER(SMC, smc);
REGISTER_DECODER(SMVJPEG, smvjpeg);
REGISTER_ENCDEC (SNOW, snow);
REGISTER_DECODER(SP5X, sp5x);
REGISTER_ENCDEC (SUNRAST, sunrast);
REGISTER_ENCDEC (SVQ1, svq1);
REGISTER_DECODER(SVQ3, svq3);
REGISTER_ENCDEC (TARGA, targa);
REGISTER_DECODER(TARGA_Y216, targa_y216);
REGISTER_DECODER(TDSC, tdsc);
REGISTER_DECODER(THEORA, theora);
REGISTER_DECODER(THP, thp);
REGISTER_DECODER(TIERTEXSEQVIDEO, tiertexseqvideo);
REGISTER_ENCDEC (TIFF, tiff);
REGISTER_DECODER(TMV, tmv);
REGISTER_DECODER(TRUEMOTION1, truemotion1);
REGISTER_DECODER(TRUEMOTION2, truemotion2);
REGISTER_DECODER(TRUEMOTION2RT, truemotion2rt);
REGISTER_DECODER(TSCC, tscc);
REGISTER_DECODER(TSCC2, tscc2);
REGISTER_DECODER(TXD, txd);
REGISTER_DECODER(ULTI, ulti);
REGISTER_ENCDEC (UTVIDEO, utvideo);
REGISTER_ENCDEC (V210, v210);
REGISTER_DECODER(V210X, v210x);
REGISTER_ENCDEC (V308, v308);
REGISTER_ENCDEC (V408, v408);
REGISTER_ENCDEC (V410, v410);
REGISTER_DECODER(VB, vb);
REGISTER_DECODER(VBLE, vble);
REGISTER_DECODER(VC1, vc1);
REGISTER_DECODER(VC1_CRYSTALHD, vc1_crystalhd);
#if FF_API_VDPAU
REGISTER_DECODER(VC1_VDPAU, vc1_vdpau);
#endif
REGISTER_DECODER(VC1IMAGE, vc1image);
REGISTER_DECODER(VC1_MMAL, vc1_mmal);
REGISTER_DECODER(VC1_QSV, vc1_qsv);
REGISTER_ENCODER(VC2, vc2);
REGISTER_DECODER(VCR1, vcr1);
REGISTER_DECODER(VMDVIDEO, vmdvideo);
REGISTER_DECODER(VMNC, vmnc);
REGISTER_DECODER(VP3, vp3);
REGISTER_DECODER(VP5, vp5);
REGISTER_DECODER(VP6, vp6);
REGISTER_DECODER(VP6A, vp6a);
REGISTER_DECODER(VP6F, vp6f);
REGISTER_DECODER(VP7, vp7);
REGISTER_DECODER(VP8, vp8);
REGISTER_DECODER(VP9, vp9);
REGISTER_DECODER(VQA, vqa);
REGISTER_DECODER(WEBP, webp);
REGISTER_ENCODER(WRAPPED_AVFRAME, wrapped_avframe);
REGISTER_ENCDEC (WMV1, wmv1);
REGISTER_ENCDEC (WMV2, wmv2);
REGISTER_DECODER(WMV3, wmv3);
REGISTER_DECODER(WMV3_CRYSTALHD, wmv3_crystalhd);
#if FF_API_VDPAU
REGISTER_DECODER(WMV3_VDPAU, wmv3_vdpau);
#endif
REGISTER_DECODER(WMV3IMAGE, wmv3image);
REGISTER_DECODER(WNV1, wnv1);
REGISTER_DECODER(XAN_WC3, xan_wc3);
REGISTER_DECODER(XAN_WC4, xan_wc4);
REGISTER_ENCDEC (XBM, xbm);
REGISTER_ENCDEC (XFACE, xface);
REGISTER_DECODER(XL, xl);
REGISTER_ENCDEC (XWD, xwd);
REGISTER_ENCDEC (Y41P, y41p);
REGISTER_DECODER(YLC, ylc);
REGISTER_DECODER(YOP, yop);
REGISTER_ENCDEC (YUV4, yuv4);
REGISTER_DECODER(ZERO12V, zero12v);
REGISTER_DECODER(ZEROCODEC, zerocodec);
REGISTER_ENCDEC (ZLIB, zlib);
REGISTER_ENCDEC (ZMBV, zmbv);
/* audio codecs */
REGISTER_ENCDEC (AAC, aac);
REGISTER_DECODER(AAC_FIXED, aac_fixed);
REGISTER_DECODER(AAC_LATM, aac_latm);
REGISTER_ENCDEC (AC3, ac3);
REGISTER_ENCDEC (AC3_FIXED, ac3_fixed);
REGISTER_ENCDEC (ALAC, alac);
REGISTER_DECODER(ALS, als);
REGISTER_DECODER(AMRNB, amrnb);
REGISTER_DECODER(AMRWB, amrwb);
REGISTER_DECODER(APE, ape);
REGISTER_DECODER(ATRAC1, atrac1);
REGISTER_DECODER(ATRAC3, atrac3);
REGISTER_DECODER(ATRAC3P, atrac3p);
REGISTER_DECODER(BINKAUDIO_DCT, binkaudio_dct);
REGISTER_DECODER(BINKAUDIO_RDFT, binkaudio_rdft);
REGISTER_DECODER(BMV_AUDIO, bmv_audio);
REGISTER_DECODER(COOK, cook);
REGISTER_ENCDEC (DCA, dca);
REGISTER_DECODER(DSD_LSBF, dsd_lsbf);
REGISTER_DECODER(DSD_MSBF, dsd_msbf);
REGISTER_DECODER(DSD_LSBF_PLANAR, dsd_lsbf_planar);
REGISTER_DECODER(DSD_MSBF_PLANAR, dsd_msbf_planar);
REGISTER_DECODER(DSICINAUDIO, dsicinaudio);
REGISTER_DECODER(DSS_SP, dss_sp);
REGISTER_DECODER(DST, dst);
REGISTER_ENCDEC (EAC3, eac3);
REGISTER_DECODER(EVRC, evrc);
REGISTER_DECODER(FFWAVESYNTH, ffwavesynth);
REGISTER_ENCDEC (FLAC, flac);
REGISTER_ENCDEC (G723_1, g723_1);
REGISTER_DECODER(G729, g729);
REGISTER_DECODER(GSM, gsm);
REGISTER_DECODER(GSM_MS, gsm_ms);
REGISTER_DECODER(IAC, iac);
REGISTER_DECODER(IMC, imc);
REGISTER_DECODER(INTERPLAY_ACM, interplay_acm);
REGISTER_DECODER(MACE3, mace3);
REGISTER_DECODER(MACE6, mace6);
REGISTER_DECODER(METASOUND, metasound);
REGISTER_ENCDEC (MLP, mlp);
REGISTER_DECODER(MP1, mp1);
REGISTER_DECODER(MP1FLOAT, mp1float);
REGISTER_ENCDEC (MP2, mp2);
REGISTER_DECODER(MP2FLOAT, mp2float);
REGISTER_ENCODER(MP2FIXED, mp2fixed);
REGISTER_DECODER(MP3, mp3);
REGISTER_DECODER(MP3FLOAT, mp3float);
REGISTER_DECODER(MP3ADU, mp3adu);
REGISTER_DECODER(MP3ADUFLOAT, mp3adufloat);
REGISTER_DECODER(MP3ON4, mp3on4);
REGISTER_DECODER(MP3ON4FLOAT, mp3on4float);
REGISTER_DECODER(MPC7, mpc7);
REGISTER_DECODER(MPC8, mpc8);
REGISTER_ENCDEC (NELLYMOSER, nellymoser);
REGISTER_DECODER(ON2AVC, on2avc);
REGISTER_DECODER(OPUS, opus);
REGISTER_DECODER(PAF_AUDIO, paf_audio);
REGISTER_DECODER(QCELP, qcelp);
REGISTER_DECODER(QDM2, qdm2);
REGISTER_ENCDEC (RA_144, ra_144);
REGISTER_DECODER(RA_288, ra_288);
REGISTER_DECODER(RALF, ralf);
REGISTER_DECODER(SHORTEN, shorten);
REGISTER_DECODER(SIPR, sipr);
REGISTER_DECODER(SMACKAUD, smackaud);
REGISTER_ENCDEC (SONIC, sonic);
REGISTER_ENCODER(SONIC_LS, sonic_ls);
REGISTER_DECODER(TAK, tak);
REGISTER_ENCDEC (TRUEHD, truehd);
REGISTER_DECODER(TRUESPEECH, truespeech);
REGISTER_ENCDEC (TTA, tta);
REGISTER_DECODER(TWINVQ, twinvq);
REGISTER_DECODER(VMDAUDIO, vmdaudio);
REGISTER_ENCDEC (VORBIS, vorbis);
REGISTER_ENCDEC (WAVPACK, wavpack);
REGISTER_DECODER(WMALOSSLESS, wmalossless);
REGISTER_DECODER(WMAPRO, wmapro);
REGISTER_ENCDEC (WMAV1, wmav1);
REGISTER_ENCDEC (WMAV2, wmav2);
REGISTER_DECODER(WMAVOICE, wmavoice);
REGISTER_DECODER(WS_SND1, ws_snd1);
REGISTER_DECODER(XMA1, xma1);
REGISTER_DECODER(XMA2, xma2);
/* PCM codecs */
REGISTER_ENCDEC (PCM_ALAW, pcm_alaw);
REGISTER_DECODER(PCM_BLURAY, pcm_bluray);
REGISTER_DECODER(PCM_DVD, pcm_dvd);
REGISTER_ENCDEC (PCM_F32BE, pcm_f32be);
REGISTER_ENCDEC (PCM_F32LE, pcm_f32le);
REGISTER_ENCDEC (PCM_F64BE, pcm_f64be);
REGISTER_ENCDEC (PCM_F64LE, pcm_f64le);
REGISTER_DECODER(PCM_LXF, pcm_lxf);
REGISTER_ENCDEC (PCM_MULAW, pcm_mulaw);
REGISTER_ENCDEC (PCM_S8, pcm_s8);
REGISTER_ENCDEC (PCM_S8_PLANAR, pcm_s8_planar);
REGISTER_ENCDEC (PCM_S16BE, pcm_s16be);
REGISTER_ENCDEC (PCM_S16BE_PLANAR, pcm_s16be_planar);
REGISTER_ENCDEC (PCM_S16LE, pcm_s16le);
REGISTER_ENCDEC (PCM_S16LE_PLANAR, pcm_s16le_planar);
REGISTER_ENCDEC (PCM_S24BE, pcm_s24be);
REGISTER_ENCDEC (PCM_S24DAUD, pcm_s24daud);
REGISTER_ENCDEC (PCM_S24LE, pcm_s24le);
REGISTER_ENCDEC (PCM_S24LE_PLANAR, pcm_s24le_planar);
REGISTER_ENCDEC (PCM_S32BE, pcm_s32be);
REGISTER_ENCDEC (PCM_S32LE, pcm_s32le);
REGISTER_ENCDEC (PCM_S32LE_PLANAR, pcm_s32le_planar);
REGISTER_ENCDEC (PCM_S64BE, pcm_s64be);
REGISTER_ENCDEC (PCM_S64LE, pcm_s64le);
REGISTER_ENCDEC (PCM_U8, pcm_u8);
REGISTER_ENCDEC (PCM_U16BE, pcm_u16be);
REGISTER_ENCDEC (PCM_U16LE, pcm_u16le);
REGISTER_ENCDEC (PCM_U24BE, pcm_u24be);
REGISTER_ENCDEC (PCM_U24LE, pcm_u24le);
REGISTER_ENCDEC (PCM_U32BE, pcm_u32be);
REGISTER_ENCDEC (PCM_U32LE, pcm_u32le);
REGISTER_DECODER(PCM_ZORK, pcm_zork);
/* DPCM codecs */
REGISTER_DECODER(INTERPLAY_DPCM, interplay_dpcm);
REGISTER_ENCDEC (ROQ_DPCM, roq_dpcm);
REGISTER_DECODER(SOL_DPCM, sol_dpcm);
REGISTER_DECODER(XAN_DPCM, xan_dpcm);
/* ADPCM codecs */
REGISTER_DECODER(ADPCM_4XM, adpcm_4xm);
REGISTER_ENCDEC (ADPCM_ADX, adpcm_adx);
REGISTER_DECODER(ADPCM_AFC, adpcm_afc);
REGISTER_DECODER(ADPCM_AICA, adpcm_aica);
REGISTER_DECODER(ADPCM_CT, adpcm_ct);
REGISTER_DECODER(ADPCM_DTK, adpcm_dtk);
REGISTER_DECODER(ADPCM_EA, adpcm_ea);
REGISTER_DECODER(ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa);
REGISTER_DECODER(ADPCM_EA_R1, adpcm_ea_r1);
REGISTER_DECODER(ADPCM_EA_R2, adpcm_ea_r2);
REGISTER_DECODER(ADPCM_EA_R3, adpcm_ea_r3);
REGISTER_DECODER(ADPCM_EA_XAS, adpcm_ea_xas);
REGISTER_ENCDEC (ADPCM_G722, adpcm_g722);
REGISTER_ENCDEC (ADPCM_G726, adpcm_g726);
REGISTER_DECODER(ADPCM_G726LE, adpcm_g726le);
REGISTER_DECODER(ADPCM_IMA_AMV, adpcm_ima_amv);
REGISTER_DECODER(ADPCM_IMA_APC, adpcm_ima_apc);
REGISTER_DECODER(ADPCM_IMA_DAT4, adpcm_ima_dat4);
REGISTER_DECODER(ADPCM_IMA_DK3, adpcm_ima_dk3);
REGISTER_DECODER(ADPCM_IMA_DK4, adpcm_ima_dk4);
REGISTER_DECODER(ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs);
REGISTER_DECODER(ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead);
REGISTER_DECODER(ADPCM_IMA_ISS, adpcm_ima_iss);
REGISTER_DECODER(ADPCM_IMA_OKI, adpcm_ima_oki);
REGISTER_ENCDEC (ADPCM_IMA_QT, adpcm_ima_qt);
REGISTER_DECODER(ADPCM_IMA_RAD, adpcm_ima_rad);
REGISTER_DECODER(ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
REGISTER_ENCDEC (ADPCM_IMA_WAV, adpcm_ima_wav);
REGISTER_DECODER(ADPCM_IMA_WS, adpcm_ima_ws);
REGISTER_ENCDEC (ADPCM_MS, adpcm_ms);
REGISTER_DECODER(ADPCM_MTAF, adpcm_mtaf);
REGISTER_DECODER(ADPCM_PSX, adpcm_psx);
REGISTER_DECODER(ADPCM_SBPRO_2, adpcm_sbpro_2);
REGISTER_DECODER(ADPCM_SBPRO_3, adpcm_sbpro_3);
REGISTER_DECODER(ADPCM_SBPRO_4, adpcm_sbpro_4);
REGISTER_ENCDEC (ADPCM_SWF, adpcm_swf);
REGISTER_DECODER(ADPCM_THP, adpcm_thp);
REGISTER_DECODER(ADPCM_THP_LE, adpcm_thp_le);
REGISTER_DECODER(ADPCM_VIMA, adpcm_vima);
REGISTER_DECODER(ADPCM_XA, adpcm_xa);
REGISTER_ENCDEC (ADPCM_YAMAHA, adpcm_yamaha);
/* subtitles */
REGISTER_ENCDEC (SSA, ssa);
REGISTER_ENCDEC (ASS, ass);
REGISTER_DECODER(CCAPTION, ccaption);
REGISTER_ENCDEC (DVBSUB, dvbsub);
REGISTER_ENCDEC (DVDSUB, dvdsub);
REGISTER_DECODER(JACOSUB, jacosub);
REGISTER_DECODER(MICRODVD, microdvd);
REGISTER_ENCDEC (MOVTEXT, movtext);
REGISTER_DECODER(MPL2, mpl2);
REGISTER_DECODER(PGSSUB, pgssub);
REGISTER_DECODER(PJS, pjs);
REGISTER_DECODER(REALTEXT, realtext);
REGISTER_DECODER(SAMI, sami);
REGISTER_ENCDEC (SRT, srt);
REGISTER_DECODER(STL, stl);
REGISTER_ENCDEC (SUBRIP, subrip);
REGISTER_DECODER(SUBVIEWER, subviewer);
REGISTER_DECODER(SUBVIEWER1, subviewer1);
REGISTER_ENCDEC (TEXT, text);
REGISTER_DECODER(VPLAYER, vplayer);
REGISTER_ENCDEC (WEBVTT, webvtt);
REGISTER_ENCDEC (XSUB, xsub);
/* external libraries */
REGISTER_ENCDEC (AAC_AT, aac_at);
REGISTER_DECODER(AC3_AT, ac3_at);
REGISTER_DECODER(ADPCM_IMA_QT_AT, adpcm_ima_qt_at);
REGISTER_ENCDEC (ALAC_AT, alac_at);
REGISTER_DECODER(AMR_NB_AT, amr_nb_at);
REGISTER_DECODER(EAC3_AT, eac3_at);
REGISTER_DECODER(GSM_MS_AT, gsm_ms_at);
REGISTER_ENCDEC (ILBC_AT, ilbc_at);
REGISTER_DECODER(MP1_AT, mp1_at);
REGISTER_DECODER(MP2_AT, mp2_at);
REGISTER_DECODER(MP3_AT, mp3_at);
REGISTER_ENCDEC (PCM_ALAW_AT, pcm_alaw_at);
REGISTER_ENCDEC (PCM_MULAW_AT, pcm_mulaw_at);
REGISTER_DECODER(QDMC_AT, qdmc_at);
REGISTER_DECODER(QDM2_AT, qdm2_at);
REGISTER_DECODER(LIBCELT, libcelt);
REGISTER_ENCDEC (LIBFDK_AAC, libfdk_aac);
REGISTER_ENCDEC (LIBGSM, libgsm);
REGISTER_ENCDEC (LIBGSM_MS, libgsm_ms);
REGISTER_ENCDEC (LIBILBC, libilbc);
REGISTER_ENCODER(LIBMP3LAME, libmp3lame);
REGISTER_ENCDEC (LIBOPENCORE_AMRNB, libopencore_amrnb);
REGISTER_DECODER(LIBOPENCORE_AMRWB, libopencore_amrwb);
REGISTER_ENCDEC (LIBOPENJPEG, libopenjpeg);
REGISTER_ENCDEC (LIBOPUS, libopus);
REGISTER_ENCDEC (LIBSCHROEDINGER, libschroedinger);
REGISTER_ENCODER(LIBSHINE, libshine);
REGISTER_ENCDEC (LIBSPEEX, libspeex);
REGISTER_ENCODER(LIBTHEORA, libtheora);
REGISTER_ENCODER(LIBTWOLAME, libtwolame);
REGISTER_ENCODER(LIBVO_AMRWBENC, libvo_amrwbenc);
REGISTER_ENCDEC (LIBVORBIS, libvorbis);
REGISTER_ENCDEC (LIBVPX_VP8, libvpx_vp8);
REGISTER_ENCDEC (LIBVPX_VP9, libvpx_vp9);
REGISTER_ENCODER(LIBWAVPACK, libwavpack);
REGISTER_ENCODER(LIBWEBP_ANIM, libwebp_anim); /* preferred over libwebp */
REGISTER_ENCODER(LIBWEBP, libwebp);
REGISTER_ENCODER(LIBX262, libx262);
REGISTER_ENCODER(LIBX264, libx264);
REGISTER_ENCODER(LIBX264RGB, libx264rgb);
REGISTER_ENCODER(LIBX265, libx265);
REGISTER_ENCODER(LIBXAVS, libxavs);
REGISTER_ENCODER(LIBXVID, libxvid);
REGISTER_DECODER(LIBZVBI_TELETEXT, libzvbi_teletext);
/* text */
REGISTER_DECODER(BINTEXT, bintext);
REGISTER_DECODER(XBIN, xbin);
REGISTER_DECODER(IDF, idf);
/* external libraries, that shouldn't be used by default if one of the
* above is available */
REGISTER_ENCDEC (LIBOPENH264, libopenh264);
REGISTER_DECODER(H263_CUVID, h263_cuvid);
REGISTER_DECODER(H264_CUVID, h264_cuvid);
REGISTER_ENCODER(H264_NVENC, h264_nvenc);
REGISTER_ENCODER(H264_OMX, h264_omx);
REGISTER_ENCODER(H264_QSV, h264_qsv);
REGISTER_ENCODER(H264_VAAPI, h264_vaapi);
REGISTER_ENCODER(H264_VIDEOTOOLBOX, h264_videotoolbox);
#if FF_API_NVENC_OLD_NAME
REGISTER_ENCODER(NVENC, nvenc);
REGISTER_ENCODER(NVENC_H264, nvenc_h264);
REGISTER_ENCODER(NVENC_HEVC, nvenc_hevc);
#endif
REGISTER_DECODER(HEVC_CUVID, hevc_cuvid);
REGISTER_DECODER(HEVC_MEDIACODEC, hevc_mediacodec);
REGISTER_ENCODER(HEVC_NVENC, hevc_nvenc);
REGISTER_ENCODER(HEVC_QSV, hevc_qsv);
REGISTER_ENCODER(HEVC_VAAPI, hevc_vaapi);
REGISTER_ENCODER(LIBKVAZAAR, libkvazaar);
REGISTER_DECODER(MJPEG_CUVID, mjpeg_cuvid);
REGISTER_ENCODER(MJPEG_VAAPI, mjpeg_vaapi);
REGISTER_DECODER(MPEG1_CUVID, mpeg1_cuvid);
REGISTER_DECODER(MPEG2_CUVID, mpeg2_cuvid);
REGISTER_ENCODER(MPEG2_QSV, mpeg2_qsv);
REGISTER_DECODER(MPEG4_CUVID, mpeg4_cuvid);
REGISTER_DECODER(MPEG4_MEDIACODEC, mpeg4_mediacodec);
REGISTER_DECODER(VC1_CUVID, vc1_cuvid);
REGISTER_DECODER(VP8_CUVID, vp8_cuvid);
REGISTER_DECODER(VP8_MEDIACODEC, vp8_mediacodec);
REGISTER_DECODER(VP9_CUVID, vp9_cuvid);
REGISTER_DECODER(VP9_MEDIACODEC, vp9_mediacodec);
/* parsers */
REGISTER_PARSER(AAC, aac);
REGISTER_PARSER(AAC_LATM, aac_latm);
REGISTER_PARSER(AC3, ac3);
REGISTER_PARSER(ADX, adx);
REGISTER_PARSER(BMP, bmp);
REGISTER_PARSER(CAVSVIDEO, cavsvideo);
REGISTER_PARSER(COOK, cook);
REGISTER_PARSER(DCA, dca);
REGISTER_PARSER(DIRAC, dirac);
REGISTER_PARSER(DNXHD, dnxhd);
REGISTER_PARSER(DPX, dpx);
REGISTER_PARSER(DVAUDIO, dvaudio);
REGISTER_PARSER(DVBSUB, dvbsub);
REGISTER_PARSER(DVDSUB, dvdsub);
REGISTER_PARSER(DVD_NAV, dvd_nav);
REGISTER_PARSER(FLAC, flac);
REGISTER_PARSER(G729, g729);
REGISTER_PARSER(GSM, gsm);
REGISTER_PARSER(H261, h261);
REGISTER_PARSER(H263, h263);
REGISTER_PARSER(H264, h264);
REGISTER_PARSER(HEVC, hevc);
REGISTER_PARSER(MJPEG, mjpeg);
REGISTER_PARSER(MLP, mlp);
REGISTER_PARSER(MPEG4VIDEO, mpeg4video);
REGISTER_PARSER(MPEGAUDIO, mpegaudio);
REGISTER_PARSER(MPEGVIDEO, mpegvideo);
REGISTER_PARSER(OPUS, opus);
REGISTER_PARSER(PNG, png);
REGISTER_PARSER(PNM, pnm);
REGISTER_PARSER(RV30, rv30);
REGISTER_PARSER(RV40, rv40);
REGISTER_PARSER(TAK, tak);
REGISTER_PARSER(VC1, vc1);
REGISTER_PARSER(VORBIS, vorbis);
REGISTER_PARSER(VP3, vp3);
REGISTER_PARSER(VP8, vp8);
REGISTER_PARSER(VP9, vp9);
}其中，几个宏的代码如下：
(1). REGISTER_HWACCEL：
详细信息点击这里学习：av_register_hwaccel()
#define REGISTER_HWACCEL(X, x) \
{ \
extern AVHWAccel ff_##x##_hwaccel; \
if (CONFIG_##X##_HWACCEL) \
av_register_hwaccel(&ff_##x##_hwaccel); \
}(2). REGISTER_ENCODER：
详细信息点击这里学习：avcodec_register()
#define REGISTER_ENCODER(X, x) \
{ \
extern AVCodec ff_##x##_encoder; \
if (CONFIG_##X##_ENCODER) \
avcodec_register(&ff_##x##_encoder); \
}(3). REGISTER_DECODER()：
详细信息点击这里学习：avcodec_register()
#define REGISTER_DECODER(X, x) \
{ \
extern AVCodec ff_##x##_decoder; \
if (CONFIG_##X##_DECODER) \
avcodec_register(&ff_##x##_decoder); \
}(4). REGISTER_ENCDEC：
详细信息点击这里学习：avcodec_register()
#define REGISTER_ENCDEC(X, x) REGISTER_ENCODER(X, x); REGISTER_DECODER(X, x)#define REGISTER_PARSER(X, x) \
{ \
extern AVCodecParser ff_##x##_parser; \
if (CONFIG_##X##_PARSER) \
av_register_codec_parser(&ff_##x##_parser); \
}。。。。。待续