FFMpeg使用x264和x265编码库
最近收到一个小任务是转换1920x1080@120Hz片源出来确认下平台120Hz的支持能力
然后看了下spec 120Hz的支持规格有
H264只有一个规格
| Level | Max macroblocks | Max video bit rate (VCL) | Examples for high resolution @ frame rate (max stored frames) | ||||
|---|---|---|---|---|---|---|---|
| per second | per frame | BP, XP, MP (kbit/s) | HiP (kbit/s) | Hi10P (kbit/s) | Hi422P, Hi444PP (kbit/s) | ||
| 5.1 | 983,040 | 36,864 | 240,000 | 300,000 | 720,000 | 960,000 | 1,920×1,[email protected] (16) 4,096×2,[email protected] (5) 4,096×2,[email protected] (5) |
H265 要5.0 level 以上才有
MPEG4也有，不过具体规格没去看
这边用ffmpeg命令生成
ffmpeg -i 132.mp4 -r 120 132.120hz.mp4
ffmpeg是默认编译的，转成120Hz的时候将编码格式默认转为了MPEG4了
General
Complete name : D:\Media\120Hz\[email protected]
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 61.4 MiB
Duration : 1 min 28 s
Overall bit rate : 5 837 kb/s
Writing application : Lavf59.4.101
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1 min 28 s
Bit rate : 5 689 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 120.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.023
Stream size : 59.8 MiB (97%)
Writing library : x264 core 150
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=34 / lookahead_threads=5 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
Language : English
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 1 min 28 s
Source duration : 1 min 28 s
Bit rate mode : Constant
Bit rate : 132 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 1.37 MiB (2%)
Source stream size : 1.37 MiB (2%)
Language : English
Default : Yes
Alternate group : 1
mdhd_Duration : 88192
因为我这边编译的ffmpeg 默认是不带x264和x265的，可以通过如下命令确认
ffmpeg -encoders
没有看到x264跟x265的支持，随手也添加下这两个的支持
x264和x265编译安装
编译帮助可以看官网介绍
https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
编译x265
下载源码和配置Cmake参数
tar xjvf x265.tar.bz2
cd multicoreware*/build/linux
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$MY_TOOLS" \
-DENABLE_SHARED=off ../../source
make
make install
编译x264
先下载编译x264支持库源码，配置编译安装prefix路径、是否静态库安装等等
cd x264/
make -j4
./configure --prefix=$MY_TOOLS --enable-static --enable-pic \
--extra-cflags="-fPIE -pie" --extra-ldflags="-fPIE -pie" --disable-asm
make -j4
make install
重编译ffmpeg
然后在重新编译ffmpeg，主要是使能 --enable-libx264 --enable-libx265 编译配置
./configure --prefix=/home/workspace5/xxxxx/tools --disable-yasm \
--enable-nonfree --enable-shared --enable-gpl --enable-libx264 \
--enable-libx265 \
--enable-debug=3 --disable-optimizations --disable-asm --disable-stripping \
--extra-cflags=-I/home/workspace5/xxxxx/tools/include \
--extra-ldflags=-L/home/workspace5/xxxxx/tools/lib \
--enable-rpath --libdir=/home/workspace5/xxxxx/tools/lib \
--extra-libs=-ldl
make -j4
make install
x264+ffmpeg编译错误处理
编译ffmpeg的时候出现ERROR: libx264 not found
最近用Linux编译ffmpeg的时候出现了错误ERROR: libx264 not found
查看config.log原因如下
./x264/libx264.a(opencl.o): In function `x264_opencl_close_library':
opencl.c:(.text+0x572): undefined reference to `dlclose'
./x264/libx264.a(opencl.o): In function `x264_opencl_load_library':
opencl.c:(.text+0x5d7): undefined reference to `dlopen'
opencl.c:(.text+0x5f1): undefined reference to `dlsym'
opencl.c:(.text+0x60e): undefined reference to `dlsym'
opencl.c:(.text+0x62b): undefined reference to `dlsym'
opencl.c:(.text+0x648): undefined reference to `dlsym'
opencl.c:(.text+0x665): undefined reference to `dlsym'
./x264/libx264.a(opencl.o):opencl.c:(.text+0x682): more undefined references to `dlsym' follow
./x264/libx264.a(opencl.o): In function `x264_opencl_load_library':
opencl.c:(.text+0x8fd): undefined reference to `dlclose'
./x264/libx264.a(opencl.o): In function `x264_opencl_lookahead_init':
opencl.c:(.text+0x1841): undefined reference to `dlopen'
opencl.c:(.text+0x185b): undefined reference to `dlsym'
opencl.c:(.text+0x186d): undefined reference to `dlsym'
opencl.c:(.text+0x1881): undefined reference to `dlsym'
opencl.c:(.text+0x1895): undefined reference to `dlsym'
opencl.c:(.text+0x18d4): undefined reference to `dlclose'
collect2: ld returned 1 exit status
查阅资料需要在ffmpeg编译的时候额外指定一下-ldl库
例如进入ffmpeg源码目录
./configure --prefix=/home/workspace5/xxxxx/tools --disable-yasm --enable-nonfree --enable-shared \
--enable-gpl --enable-libx264 --enable-debug=3 --disable-optimizations --disable-asm --disable-stripping \
--extra-cflags=-I/home/workspace5/xxxxx/tools/include --extra-ldflags=-L/home/workspace5/xxxxx/tools/lib \
--enable-rpath --libdir=/home/workspace5/xxxxx/tools/lib --extra-libs=-ldl
重点在于
--extra-libs=-ldl
然后可以通过 如下命令获取x264的帮助，可以看到版本信息，编译和运行配置和格式支持及命令帮助等
$ffmpeg -h encoder=libx264
ffmpeg version N-103078-gbc5faac Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.4)
configuration: --prefix=/home/workspace5/xxxxx/tools --disable-yasm --enable-nonfree --enable-shared \
--enable-gpl --enable-libx264 --enable-debug=3 --disable-optimizations --disable-asm --disable-stripping \
--extra-cflags=-I/home/workspace5/xxxxx/tools/include --extra-ldflags=-L/home/workspace5/xxxxx/tools/lib \
--enable-rpath --libdir=/home/workspace5/xxxxx/tools/lib --extra-libs=-ldl
libavutil 57\. 2.100 / 57\. 2.100
libavcodec 59\. 3.102 / 59\. 3.102
libavformat 59\. 4.101 / 59\. 4.101
libavdevice 59\. 0.100 / 59\. 0.100
libavfilter 8\. 1.103 / 8\. 1.103
libswscale 6\. 0.100 / 6\. 0.100
libswresample 4\. 0.100 / 4\. 0.100
libpostproc 56\. 0.100 / 56\. 0.100
Encoder libx264 [libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10]:
General capabilities: dr1 delay threads
Threading capabilities: other
Supported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16 nv21
libx264 AVOptions:
-preset E..V....... Set the encoding preset (cf. x264 --fullhelp) (default "medium")
-tune E..V....... Tune the encoding params (cf. x264 --fullhelp)
-profile E..V....... Set profile restrictions (cf. x264 --fullhelp)
-fastfirstpass E..V....... Use fast settings when encoding first pass (default true)
-level E..V....... Specify level (as defined by Annex A)
-passlogfile E..V....... Filename for 2 pass stats
-wpredp E..V....... Weighted prediction for P-frames
-a53cc E..V....... Use A53 Closed Captions (if available) (default true)
-x264opts E..V....... x264 options
-crf E..V....... Select the quality for constant quality mode (from -1 to FLT_MAX) (default -1)
-crf_max E..V....... In CRF mode, prevents VBV from lowering quality beyond this point. (from -1 to FLT_MAX) (default -1)
-qp E..V....... Constant quantization parameter rate control method (from -1 to INT_MAX) (default -1)
-aq-mode E..V....... AQ method (from -1 to INT_MAX) (default -1)
none 0 E..V.......
variance 1 E..V....... Variance AQ (complexity mask)
autovariance 2 E..V....... Auto-variance AQ
autovariance-biased 3 E..V....... Auto-variance AQ with bias to dark scenes
-aq-strength E..V....... AQ strength. Reduces blocking and blurring in flat and textured areas. (from -1 to FLT_MAX) (default -1)
-psy E..V....... Use psychovisual optimizations. (default auto)
-psy-rd E..V....... Strength of psychovisual optimization, in : format.
-rc-lookahead E..V....... Number of frames to look ahead for frametype and ratecontrol (from -1 to INT_MAX) (default -1)
-weightb E..V....... Weighted prediction for B-frames. (default auto)
-weightp E..V....... Weighted prediction analysis method. (from -1 to INT_MAX) (default -1)
none 0 E..V.......
simple 1 E..V.......
smart 2 E..V.......
-ssim E..V....... Calculate and print SSIM stats. (default auto)
-intra-refresh E..V....... Use Periodic Intra Refresh instead of IDR frames. (default auto)
-bluray-compat E..V....... Bluray compatibility workarounds. (default auto)
-b-bias E..V....... Influences how often B-frames are used (from INT_MIN to INT_MAX) (default INT_MIN)
-b-pyramid E..V....... Keep some B-frames as references. (from -1 to INT_MAX) (default -1)
none 0 E..V.......
strict 1 E..V....... Strictly hierarchical pyramid
normal 2 E..V....... Non-strict (not Blu-ray compatible)
-mixed-refs E..V....... One reference per partition, as opposed to one reference per macroblock (default auto)
-8x8dct E..V....... High profile 8x8 transform. (default auto)
-fast-pskip E..V....... (default auto)
-aud E..V....... Use access unit delimiters. (default auto)
-mbtree E..V....... Use macroblock tree ratecontrol. (default auto)
-deblock E..V....... Loop filter parameters, in form.
-cplxblur E..V....... Reduce fluctuations in QP (before curve compression) (from -1 to FLT_MAX) (default -1)
-partitions E..V....... A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all
-direct-pred E..V....... Direct MV prediction mode (from -1 to INT_MAX) (default -1)
none 0 E..V.......
spatial 1 E..V.......
temporal 2 E..V.......
auto 3 E..V.......
-slice-max-size E..V....... Limit the size of each slice in bytes (from -1 to INT_MAX) (default -1)
-stats E..V....... Filename for 2 pass stats
-nal-hrd E..V....... Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) (from -1 to INT_MAX) (default -1)
none 0 E..V.......
vbr 1 E..V.......
cbr 2 E..V.......
-avcintra-class E..V....... AVC-Intra class 50/100/200/300/480 (from -1 to 480) (default -1)
-me_method E..V....... Set motion estimation method (from -1 to 4) (default -1)
dia 0 E..V.......
hex 1 E..V.......
umh 2 E..V.......
esa 3 E..V.......
tesa 4 E..V.......
-motion-est E..V....... Set motion estimation method (from -1 to 4) (default -1)
dia 0 E..V.......
hex 1 E..V.......
umh 2 E..V.......
esa 3 E..V.......
tesa 4 E..V.......
-forced-idr E..V....... If forcing keyframes, force them as IDR frames. (default false)
-coder E..V....... Coder type (from -1 to 1) (default default)
default -1 E..V.......
cavlc 0 E..V.......
cabac 1 E..V.......
vlc 0 E..V.......
ac 1 E..V.......
-b_strategy E..V....... Strategy to choose between I/P/B-frames (from -1 to 2) (default -1)
-chromaoffset E..V....... QP difference between chroma and luma (from INT_MIN to INT_MAX) (default 0)
-sc_threshold E..V....... Scene change threshold (from INT_MIN to INT_MAX) (default -1)
-noise_reduction E..V....... Noise reduction (from INT_MIN to INT_MAX) (default -1)
-x264-params E..V....... Override the x264 configuration using a :-separated list of key=value parameters
添加完x264编码库后就是可以配置其Codec模式编码生成120Hz片源了，主要是配置 -c:v libx264， x265同理
ffmpeg -i 132.mp4 -c:v libx264 -r 120 132.120hz.mp4
关于 ffmpeg x264更多使用方法可以看
https://www.likecs.com/show-279356.html
H.264 Video Encoding Guide
代码的使用方法可以参考
FFmpeg H264编码
使用FFmpeg实现H.264编码