[OpenCV]关于opencv不能打开某些视频得问题

opencv不能打开某些视频困扰了我好久，我一直认为是少安装了某个视频解码器，在尝试了几种解码器后，终于发现安装Xvid解码器后就可以了。它到底是什么东东？它得官方网站http://www.xvid.org/，可以下载最新得解码器。其实就是安装一个mpeg4得解码器而已。一些解码器如下：

orking video codecs
codec name	fourcc	codecfile	out	comments
MPEG-PES output (.mpg or DXR3/DVB card)	-	-	MPES	for hardware decoding
MPEG-1 or 2 (libmpeg2)	- DVR  hdv2 mpg1 PIM1 VCR2 mpg2	-	YV12 I420 IYUV 422P	with postprocessing
FFmpeg MPEG-1	- mpg1 PIM1 VCR2	mpeg1video	YV12 I420 IYUV	-
FFmpeg MPEG-2	- mpg2 DVR  hdv2	mpeg2video	YV12 I420 IYUV 422P 444P	-
FFmpeg MPEG-1/2	- mpg1 mpg2 PIM1 VCR2 DVR  hdv2	mpegvideo	YV12 I420 IYUV 422P 444P	-
NuppelVideo	NUV1 RJPG	-	I420 IYUV	-
FFmpeg PNG decoder	mpng MPNG png	png	BGR32 BGR24 BGR8 Y800 RGB32 RGB24 RGB8	-
PNG image decoder	mpng MPNG png	libpng	BGR32 BGR24 BGR8 Y800	Gray scaled PNG with Alpha channel not supported
TGA image decoder	mtga MTGA	-	BGR32 BGR24	Only 24bpp and 32bpp RGB TGA files supported
SGI image decoder	SGI1	-	BGR24	-
FFmpeg Intel Indeo 3.1/3.2	IV31 iv31 IV32 iv32	indeo3	YVU9	-
Autodesk FLI/FLC Animation	FLIC	flic	BGR8	-
Autodesk RLE decoder	AASC	aasc	BGR24	-
LOCO video decoder	LOCO	loco	422P YV12 BGR32 BGR24	-
QuickTime Animation (RLE)	rle	qtrle	BGR32 RGB24 BGR15 BGR8	-
QuickTime Apple Video	rpza azpr	rpza	BGR15	-
Apple Graphics (SMC) codec	smc	smc	BGR8	-
Planar RGB (Photoshop)	8BPS	8bps	BGR32 BGR24 BGR8	-
Creative YUV (libavcodec)	cyuv CYUV	cyuv	411P	-
Microsoft RLE	- WRLE	msrle	BGR8	-
Id RoQ File Video Decoder	RoQV	roqvideo	YV12	-
LZO compressed	LZO1	liblzo	YV12 I420 BGR24	-
Theora (free reworked VP3)	theo Thra	libtheora	YV12	-
Cinepak Video (native codec)	cvid CVID	cinepak	YV12 BGR8	-
Cinepak Video	cvid	iccvid.dll	BGR24 BGR15	-
Microsoft Video 1 (native codec)	cram CRAM msvc MSVC wham WHAM	msvideo1	BGR15 BGR8	-
AVImszh (native codec)	MSZH	mszh	BGR24	-
AVIzlib (native codec)	ZLIB	zlib	BGR24	-
FFmpeg HuffYUV	HFYU FFVH	huffyuv	YUY2 422P YV12 BGR32 BGR24	-
FFV1 (lossless codec)	FFV1	ffv1	411P 444P 422P YV12 I420 IYUV YVU9 BGR32	-
FFSNOW (Michael's wavelet codec)	snow SNOW	snow	YV12	-
FFmpeg ASUS V1	ASV1	asv1	YV12 I420 IYUV	-
FFmpeg ASUS V2	ASV2	asv2	YV12 I420 IYUV	-
FFmpeg ATI VCR1	VCR1	vcr1	YVU9	-
FFmpeg Cirrus Logic AccuPak (CLJR)	CLJR	cljr	411P	-
FFmpeg Sorenson Video v1 (SVQ1)	SVQ1 svq1	svq1	YVU9	-
FFmpeg 4XM video	4XMV	4xm	BGR16	-
Miro VideoXL codec	VIXL	xl	411P	-
QuickDraw native decoder	qdrw	qdraw	RGB24	-
Indeo 2 native decoder	RT21	indeo2	YVU9	-
FFmpeg Flash video	FLV1	flv	YV12	-
FFmpeg DivX ;-) (MS MPEG-4 v3)	MPG3 mpg3 MP43 mp43 DIV5 div5 DIV6 div6 DIV3 div3 DIV4 div4 AP41 COL1 col1 COL0 col0 3IVD 3ivd	msmpeg4	YV12 I420 IYUV	-
FFmpeg M$ MPEG-4 v2	DIV2 div2 MP42 mp42	msmpeg4v2	YV12 I420 IYUV	-
FFmpeg M$ MPEG-4 v1	DIV1 div1 MPG4 mpg4	msmpeg4v1	YV12 I420 IYUV	-
FFmpeg M$ WMV1/WMV7	WMV1 wmv1	wmv1	YV12 I420 IYUV	-
FFmpeg H.264	H264 h264 avc1	h264	YV12 I420 IYUV	-
FFmpeg Sorenson Video v3 (SVQ3)	SVQ3	svq3	YV12 I420 IYUV	-
FFmpeg MPEG-4	FMP4 fmp4 DIVX divx DIV1 div1 MP4S mp4s M4S2 m4s2 xvid XVID XviD XVIX DX50 dx50 BLZ0 mp4v MP4V UMP4 3IV2 3iv2 DXGM	mpeg4	YV12 I420 IYUV	-
WV1F MPEG-4	WV1F	mpeg4	YV12 I420 IYUV	-
XviD (MPEG-4)	DIVX divx xvid XVID XviD	libxvidcore.a	YV12 I420 YUY2 UYVY YVYU BGR32 BGR24 BGR16 BGR15	-
OpenDivX API (ODIVX DIVX4 DIVX5 XVID)	mp4v DIVX divx DIV1 div1 MP43 mp43 DIV3 div3 DIV4 div4 AP41 xvid XVID XviD DX50 BLZ0	libdivxdecore.so	YV12 I420 IYUV	with postprocessing
DivX4Linux API (DIVX4 DIVX5 XVID)	mp4v DIVX divx DIV1 div1 MP43 mp43 DIV3 div3 DIV4 div4 AP41 xvid XVID XviD DX50 BLZ0	libdivxdecore.so	YUY2 UYVY BGR32 BGR24 BGR16 BGR15	with postprocessing
DivX ;-) (MS MPEG-4 v3)	MP43 mp43 DIV5 div5 DIV6 div6 DIV3 div3 DIV4 div4 AP41	divx_c32.ax	YUY2 UYVY BGR32 BGR24 BGR16 BGR15	with postprocessing
DivX ;-) (MS MPEG-4 v3)	MP43 mp43 DIV5 div5 DIV6 div6 DIV3 div3 DIV4 div4 AP41	divxc32.dll	YUY2 BGR32 BGR24 BGR15	-
Microsoft MPEG-4 v1/v2	DIV2 div2 MP4S mp4s MPG4 mpg4 MP42 mp42	mpg4ds32.ax	YUY2	with postprocessing
Microsoft MPEG-4 v1/v2	MPG4 mpg4 MP42 mp42 DIV2	mpg4c32.dll	YUY2 BGR32 BGR24 BGR15	-
Windows Media Video 8	WMV2	wmv8ds32.ax	YV12 I420 IYUV YUY2 UYVY	-
Windows Media Video 7	WMV1	wmvds32.ax	YUY2 UYVY	-
Windows Media Video 9 DMO	WMV3 WMVP	wmv9dmod.dll	YV12 YUY2 UYVY	-
Windows Media Video DMO	WMV1 WMV2 WMV3 WMVP	wmvdmod.dll	YV12 YUY2 UYVY	-
Windows Media Video Adv DMO	WMVA WVP2	wmvadvd.dll	YV12 YUY2 UYVY	-
Windows Media Screen Codec 2	MSS1 MSS2	wmsdmod.dll	BGR32 BGR24 BGR16	-
FFmpeg MJPEG decoder	MJPG mjpg AVRn AVDJ jpeg mjpa JFIF ijpg IJPG JPEG JPGL LJPG dmb1	mjpeg	444P 422P YUY2 YV12 I420 IYUV BGR32	-
FFmpeg MJPEG-B decoder	mjpb	mjpegb	444P 422P YUY2 YV12 I420 IYUV	-
Independent JPEG Group's codec	ijpg IJPG jpeg AVRn AVDJ	libjpeg	RGB24 BGR24 BGR32	-
Morgan Motion JPEG Codec	MJPG mjpa mjpb mjpg dmb1	m3jpeg32.dll	YUY2 UYVY BGR32 BGR24 BGR15	-
MainConcept Motion JPEG	MJPG mjpa mjpb mjpg	mcmjpg32.dll	YUY2 UYVY BGR32 BGR24 BGR15	-
AVID Motion JPEG	AVRn AVDJ MJPG mjpg	AvidAVICodec.dll	BGR24	slooooooooow but stable
LEAD (M)JPEG	MJPG jpeg LEAD	LCodcCMP.dll	BGR24 BGR15	supports interlaced MJPEG
Morgan MJPEG2000	MJ2C	m3jp2k32.dll	YV12 I420 IYUV YUY2 UYVY BGR32 BGR24 BGR15	-
Vivo H.263	VIVO vivo viv1 viv2	ivvideo.dll	BGR32 BGR24 BGR15	-
UB Video H.263/H.263+/H.263++ Decoder	U263 vivo VIVO viv1	ubv263d+.ax	BGR24	-
I263	I263 i263 vivo VIVO viv1	i263_32.drv	I420 YUY2 BGR32 BGR24 BGR15	-
FFmpeg I263 decoder	I263 i263	h263i	YV12 I420 IYUV	-
FFmpeg H.263+ decoder	H263 U263 h263 X263 viv1 s263	h263	YV12 I420 IYUV	-
CCITT H.261	H261 h261	h261	YV12	-
Intel Indeo 5	IV50 iv50	ir50_32.dll	YV12 IYUV I420 YUY2 UYVY BGR32 BGR24 BGR16 BGR15	-
Intel Indeo 5	IV50 iv50	ir50_32.dll	YUY2 BGR32 BGR24 BGR15	-
Intel Indeo 4.1	IV41 iv41	ir41_32.dll	IF09 BGR24 BGR15	-
Intel Indeo 3.1/3.2	IV31 iv31 IV32 iv32	ir32_32.dll	IF09 BGR24 BGR15	-
XAnim's Intel Indeo 5	IV50 iv50	vid_iv50.xa	YVU9	-
XAnim's Intel Indeo 4.1	IV41 iv41	vid_iv41.xa	YVU9	-
XAnim's Intel Indeo 3.1/3.2	IV31 iv31 IV32 iv32	vid_iv32.xa	YVU9	-
Sony Digital Video (DV)	dvsl dvsd dvhd DVSD dvcp dvc	qdv.dll	YUY2 UYVY BGR24 BGR16 BGR15	-
FFmpeg DV decoder	DVSD dvsd DVCS dvcs dvcp dvc	dvvideo	411P YV12	-
Raw DV decoder (libdv)	DVSD dvsd DVCS dvcs dvcp dvc  AVdv	libdv.so.2	YUY2	-
MainConcept DV Codec	DVSD dvsd DVCS dvcs CDVC cdvc dvcp dvc	mcdvd_32.dll	YUY2 UYVY BGR32 BGR24 BGR15	-
XAnim's 3ivx Delta 3.5 plugin	3IV1	vid_3ivX.xa	YV12 IYUV I420	-
Linux RealPlayer 10 RV30/40 decoder	RV30 rv30 RV40 rv40	drvc.so	I420	-
Linux RealPlayer 9 RV40 decoder	RV40 rv40	drv4.so.6.0	I420	-
Win32 RealPlayer 9 RV40 decoder	RV40 rv40	drv43260.dll	I420	-
Mac OS X RealPlayer 9 RV40 decoder	RV40 rv40	drvc.bundle/Contents/MacOS/drvc	I420	-
Linux RealPlayer 8 RV30 decoder	RV30 rv30	drv3.so.6.0	I420	-
Win32 RealPlayer 8 RV30 decoder	RV30 rv30	drv33260.dll	I420	-
Mac OS X RealPlayer 9 RV30 decoder	RV30 rv30	drvc.bundle/Contents/MacOS/drvc	I420	-
Linux RealPlayer 8 RV20 decoder	RV20 rv20	drv2.so.6.0	I420	-
Win32 RealPlayer 8 RV20 decoder	RV20 rv20	drv23260.dll	I420	-
Mac OS X RealPlayer 9 RV20 decoder	RV20 rv20	drv2.bundle/Contents/MacOS/drv2	I420	-
Alparysoft lossless codec dshow	ASLC	aslcodec_dshow.dll	BGR24	-
Alparysoft lossless codec vfw	ASLC	aslcodec_vfw.dll	BGR24	-
Lead CMW wavelet 2.0	LCW2	LCODCCMW2E.dll	BGR24 BGR8	-
FFmpeg RV10 decoder	RV10 rv10 RV13 rv13	rv10	YV12 I420 IYUV	-
On2 Open Source VP3 Codec	VP30 vp30 VP31 vp31	vp31vfw.dll	YUY2 BGR32 BGR24 BGR15	For SSE-systems use fixed DLL from ftp://mplayerhq.hu/MPlayer/samples/drivers32/
On2 VP4 Personal Codec	VP40 VP31 VP30 vp31 vp30	vp4vfw.dll	YUY2 BGR32 BGR24	Decodes also VP3
On2 VP5 Personal Codec	VP50	vp5vfw.dll	YUY2 BGR32 BGR24	-
On2 VP6 Personal Codec	VP60 VP61 VP62	vp6vfw.dll	YUY2 BGR32 BGR24	-
Motion Wavelets	MWV1	icmw_32.dll	BGR24 BGR15	-
ASUS V2	ASV2	asusasv2.dll	UYVY BGR32 BGR24 BGR15	-
ASUS V1	ASV1	asusasvd.dll	UYVY BGR32 BGR24 BGR15	-
IBM Ultimotion native decoder	ULTI	ultimotion	YVU9	-
IBM Ultimotion	ULTI	ultimo.dll	YUY2 UYVY BGR32 BGR24 BGR15	-
Windows Screen Video	MSS1	msscds32.ax	BGR32 BGR24 BGR16 BGR15	-
UCOD-ClearVideo	UCOD	clrviddd.dll	BGR32 BGR24 BGR15	-
ATI VCR-2	VCR2	ativcr2.dll	YV12 BGR24	-
Duck Truemotion1	DUCK	truemotion1	BGR15 BGR16 BGR24	-
TrueMotion 2.0	TM20	tm20dec.ax	BGR32 BGR24 BGR16	YUV faulting
SP5x codec - used by Aiptek MegaCam	SP53 SP54 SP55 SP56 SP57 SP58	sp5x	YV12	-
SP5x codec - used by Aiptek MegaCam	SP53 SP54 SP55 SP56 SP57 SP58	sp5x_32.dll	BGR24 BGR15	-
SoftMedia ViVD V2 codec VfW	GXVE gxve	ViVD2.dll	YUY2 YV12 I420 YVU9 BGR32 BGR24 BGR15	-
Winnov Videum winx codec	WINX	wnvwinx.dll	BGR32 BGR24 BGR15	-
FFmpeg wnv1 native codec	WNV1	wnv1	422P	-
Winnov Videum wnv1 codec	WNV1	wnvplay1.dll	BGR32 BGR24 BGR15	-
VDOWave codec	VDOM	vdowave.drv	BGR24	-
Vianet Lsvx Video Decoder	lsvx lsvm lsvc	lsvxdec.dll	BGR32 BGR24 BGR16	-
VMware video	VMnc	vmnc.dll	BGR24 BGR15 BGR8	-
win32/quicktime 3IV1 (3ivx) decoder	3IV1	3ivx Delta 3.5.qtx	YUY2	-
Win32/QuickTime Avid Meridien Uncompressed	AVUI	AvidQTAVUICodec.qtx	YUY2	-
Win32/QuickTime Cinepak decoder	cvid	QuickTime.qts	YUY2	-
Win32/QuickTime SVQ3 decoder	SVQ3	QuickTimeEssentials.qtx	YUY2	-
VSS Codec Light	VSSV	vsslight.dll	BGR24	-
VSS H.264 New	VSSH	vsshdsd.dll	YV12	-
VSS H.264 Old	VSSH	vssh264.dll	BGR24	-
VSS Wavelet Video Codec	VSSW	vsswlt.dll	BGR24	-
AVIzlib	ZLIB	avizlib.dll	BGR24	24bpp only
AVImszh	MSZH	avimszh.dll	BGR24	24bpp only
Q-Team's QPEG (www.q-team.de)	Q1.0 QPEG Q1.1 qpeq	qpeg32.dll	BGR8	BGR8 only!
TechSmith Camtasia Screen Codec (native)	TSCC tscc	camtasia	BGR32 BGR24 BGR15 BGR8	-
TechSmith Camtasia Screen Codec	TSCC tscc	tsccvid.dll	BGR32 BGR24 BGR15 BGR8	-
FRAPS: Realtime Video Capture	FPS1 fps1	frapsvid.dll	BGR32	Requires a processor with SSE???
RAW RGB32	- raw  BGR	-	RGB32	-
RAW RGB24	- raw  BGR	-	RGB24	-
RAW RGB16	- raw  BGR	-	RGB16	-
RAW BGR32	-	-	BGR32	-
RAW BGR32	- RGB	-	BGR32	-
RAW BGR24	-	-	BGR24	-
RAW BGR24	- raw  RGB	-	BGR24	-
RAW BGR15	-	-	BGR16	-
RAW BGR15	- raw  RGB	-	BGR16	-
RAW BGR15	-	-	BGR15	-
RAW BGR15	- raw  RGB	-	BGR15	-
RAW BGR8	-	-	BGR8	-
RAW BGR8	- raw  RGB	-	BGR8	-
RAW BGR1	- raw  RGB	-	BGR1	-
RAW YUY2	- raw  yuy2 YUY2	-	YUY2	-
RAW UYVY	- raw  uyvy UYVY	-	UYVY	-
RAW 444P	- raw  444p 444P	-	444P	-
RAW 422P	- raw  422p 422P	-	422P	-
RAW YV12	- raw  yv12 YV12	-	YV12	-
RAW NV21	- raw  nv21 NV21	-	YV12	-
RAW NV12	- raw  nv12 NV12	-	YV12	-
RAW HM12	- raw  hm12 HM12	-	YV12	-
RAW I420	- raw  i420 I420 IYUV iyuv	-	I420 IYUV	-
RAW YVU9	- raw  yvu9 YVU9	-	YVU9	-
RAW Y8/Y800	- Y8  y800 Y800	-	Y800 Y8	-
New / Untested codecs
codec name	fourcc	codecfile	problem
FFmpeg ZyGo	ZyGo	h263	-
M261	m261 M261	msh261.drv	-
FFmpeg RV20 decoder	RV20 rv20	rv20	-
FFmpeg VP3	VP30 vp30 VP31 vp31 VP3	vp3	-
FFmpeg Theora	theo Thra	theora	-
CJPG	CJPG	CtWbJpg.DLL	sample files needed (this DLL is decompression only!)
Win32/QuickTime BeHereiVideo decoder	bhiv	BeHereiVideo.qtx	sample file wanted!
Codecs with problems
codec name	fourcc	codecfile	problem
FFmpeg MPEG-1/2 (XvMC)	- mpg1 mpg2 DVR  hdv2 PIM1 VCR2	mpegvideo_xvmc	-
Microsoft Video 1	cram CRAM msvc MSVC wham WHAM	msvidc32.dll	-vf palette required for 8bpp
HuffYUV	HFYU	huffyuv.dll	-
XAnim's Radius Cinepak Video	cvid	vid_cvid.xa	-
FFmpeg M$ WMV2/WMV8