交叉编译ffmpeg-4.2.2

2023-05-16

最近想弄个USB camera，测试下视频功能。看到网上推荐使用FFmpeg这个开源工具。
FFmpeg: A complete, cross-platform solution to record, convert and stream audio and video.
官网地址： http://ffmpeg.org/
下载最新的 FFmpeg 4.2.2源码。参考了其他文章，FFmpeg编译还需要以下3个开源库：
1）x264 -- library and application for encoding video streams into the H.264/MPEG-4 AVC compression format
官网地址： http://www.videolan.org/developers/x264.html

2）YASM -- a complete rewrite of the NASM assembler
官网地址：http://yasm.tortall.net/

3）SDL2 -- Simple DirectMedia Layer
官网地址：http://www.libsdl.org/index.php

在编译之前，准备好交叉工具链，初始化编译工具交叉变量 CROSS_COMPILE
推荐用绝对路径：
export CROSS_COMPILE=/home/golden/gcc/usr/bin/arm-oe-linux-gnueabi/arm-oe-linux-gnueabi-
export CC=${CROSS_COMPILE}gcc
也可以 export CROSS_COMPILE=arm-oe-linux-gnueabi- ，但在后续编译过程中，会经常遇到类似的错误：

INSTALL	libavdevice/libavdevice.so
STRIP	install-libavdevice-shared
/bin/sh: 1: arm-oe-linux-gnueabi-strip: not found
make: *** [ffbuild/library.mak:104: install-libavdevice-shared] Error 127

解决办法就是需要手动用绝对路径代替，
~~./ffbuild/config.mak~:STRIP=arm-oe-linux-gnueabi-strip~~
./ffbuild/config.mak:STRIP=/home/golden/gcc/usr/bin/arm-oe-linux-gnueabi/arm-oe-linux-gnueabi-strip

源码编译

1) 编译x264

# wget https://code.videolan.org/videolan/x264/-/archive/master/x264-master.tar.bz2
# tar xvjf x264-master.tar.bz2
# cd x264-master
# ./configure --host=arm-linux --prefix=/usr/local/x264-arm --enable-shared --enable-debug --disable-asm

接下来，打上下面的patch

diff --git a/Makefile~ b/Makefile
index efc863f..2ad60af 100644
--- a/Makefile~
+++ b/Makefile
@@ -243,7 +243,7 @@ lib-shared: $(SONAME)
 
 $(LIBX264): $(GENERATED) .depend $(OBJS) $(OBJASM)
 	rm -f $(LIBX264)
-	$(AR)$@ $(OBJS) $(OBJASM)
+	$(AR) $@ $(OBJS) $(OBJASM)
 	$(if $(RANLIB), $(RANLIB) $@)
 
 $(SONAME): $(GENERATED) .depend $(OBJS) $(OBJASM) $(OBJSO)

diff --git a/config.mak~ b/config.mak
index f10ce66..5eaa865 100644
--- a/config.mak~
+++ b/config.mak
@@ -6,7 +6,7 @@ libdir=${exec_prefix}/lib
 includedir=${prefix}/include
 SYS_ARCH=ARM
 SYS=LINUX
-CC=gcc
+CC?=${CROSS_COMPILE}gcc
 CFLAGS=-Wno-maybe-uninitialized -Wshadow -O1 -g  -Wall -I. -I$(SRCPATH) -std=gnu99 -D_GNU_SOURCE -fPIC -fno-tree-vectorize -fvisibility=hidden
 CFLAGSSO= -DX264_API_EXPORTS
 CFLAGSCLI=
@@ -14,13 +14,13 @@ COMPILER=GNU
 COMPILER_STYLE=GNU
 DEPMM=-MM -g0
 DEPMT=-MT
-LD=gcc -o 
+LD=${CROSS_COMPILE}gcc -o 
 LDFLAGS= -lm -lpthread -ldl
 LDFLAGSCLI=-ldl 
 LIBX264=libx264.a
 CLI_LIBX264=$(LIBX264)
-AR=gcc-ar rc 
-RANLIB=gcc-ranlib
+AR=${CROSS_COMPILE}gcc-ar rc 
+RANLIB=${CROSS_COMPILE}gcc-ranlib
 STRIP=strip
 INSTALL=install
 AS=

# make
# make install

2) 编译YASM

# wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
# tar xvzf yasm-1.3.0.tar.gz
# cd yasm-1.3.0
# ./configure --prefix=/usr/local/ --host=arm-linux
# make
# make install

3) 编译SDL2

# wget http://www.libsdl.org/release/SDL2-2.0.12.tar.gz
# tar xvzf SDL2-2.0.12.tar.gz
# cd SDL2-2.0.12
# ./configure --prefix=/usr/local/ --host=arm-linux --target=arm-linux
# make
# make install

4) 最后编译FFmpeg

# wget https://ffmpeg.org/releases/ffmpeg-4.2.2.tar.bz2
# tar xvjf ffmpeg-4.2.2.tar.bz2
# cd ffmpeg-4.2.2
# ./configure --cross-prefix=$CROSS_COMPILE --enable-cross-compile --target-os=linux --cc="$CC" --arch=arm --prefix=/usr/local/arm_ffmpeg --enable-shared --disable-static --enable-gpl --enable-nonfree --enable-swscale --enable-pthreads --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-yasm --enable-ffmpeg --enable-ffplay --enable-sdl2

关于这一步，如果你不加上最后“ --enable-sdl2” ，那么编译出来后，只有ffmpeg ffprobe，是没有ffplay，之前网上其他文章说修改config.mak文件的CONFIG_FFPLAY宏，在4.2.2版本上，行不通，首先文件跑到 ffbuild/config.mak中了，另外还有config.h也得改，最终一点是ffplay依赖sdl2库：
configure：ffplay_deps="avcodec avformat swscale swresample sdl2"
这一步，报过一个错误： ERROR: sdl2 requested but not found
这是因为configure文件中SDL2_CONFIG定义无效,
if enabled sdl2; then
SDL2_CONFIG="${cross_prefix}sdl2-config"
test_pkg_config sdl2 "sdl2 >= 2.0.1 sdl2 < 2.1.0" SDL_events.h SDL_PollEvent
if disabled sdl2 && "${SDL2_CONFIG}" --version > /dev/null 2>&1; then
我的做法就是添加一个链接：
# which sdl2-config
/usr/local/bin/sdl2-config
# sudo ln -s sdl2-config /usr/local/bin/arm-oe-linux-gnueabi-sdl2-confi

# make
# make install

最后编译出来的结果，就在 /usr/local/arm_ffmpeg/。

这里提一点， ./configure配置这一步，千万不要加上 --disable-stripping
否则编译出来的大小和内存要求，超乎你的想象，一张对比图

将bin 和lib目录下的内容分别复制到板子中的/usr/bin 、/usr/lib中，除此之外，不要忘了也要把SDL2.so也复制到/usr/lib,
如果发现so过大，也可以用strip命令裁剪掉冗余。

这样就可以测试ffmpeg了
# ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 /data/test.avi 录制视频
# ffmpeg -i /dev/video0 -r 1 -f image2 image-%3d.jpg 截图,以1PFS的速度保存成JPEG图片 imag-001.jpg image-002....
# ffplay -i /dev/video0 实时视频
# ffplay -i /data/test.avi 播放视频

参考文章： https://mp.csdn.net/console/editor/html/104897666
FFmpeg/FFplay使用： https://blog.csdn.net/weixin_38513602/article/details/85165023

性能测试

root@mdm9607:/data# ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 /data/test.

avi
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 6.4.0 (GCC)
  configuration: --cross-prefix=arm-oe-linux-gnueabi- --enable-cross-compile --t
arget-os=linux --cc='arm-oe-linux-gnueabi-gcc -march=armv7-a -marm -mfpu=neon -m
float-abi=hard' --arch=arm --prefix=/usr/local/arm_ffmpeg --enable-shared --disa
ble-static --enable-gpl --enable-nonfree --enable-swscale --enable-pthreads --di
sable-armv5te --disable-armv6 --disable-armv6t2 --disable-yasm --enable-sdl2 --d
isable-lzma
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 6541.122738, bitrate: 147456 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 k
b/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
File '/data/test.avi' already exists. Overwrite ? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
Press [q] to stop, [?] for help
Output #0, avi, to '/data/test.avi':
  Metadata:
    ISFT            : Lavf58.29.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480, q=2-31, 200
 kb/s, 30 fps, 30 tbn, 30 tbc
    Metadata:
      encoder         : Lavc58.54.100 mpeg4
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame=   10 fps=0.0 q=2.3 size=       6kB time=00:00:02.43 bitrate=  18.7kbits/s
frame=   21 fps= 19 q=2.7 size=       6kB time=00:00:02.90 bitrate=  15.7kbits/s
frame=   35 fps= 21 q=2.7 size=       6kB time=00:00:03.43 bitrate=  13.2kbits/s
frame=   45 fps= 21 q=2.2 size=       6kB time=00:00:03.83 bitrate=  11.8kbits/s
frame=   60 fps= 22 q=2.7 size=       6kB time=00:00:04.43 bitrate=  10.2kbits/s
frame=   70 fps= 22 q=2.6 size=       6kB time=00:00:04.83 bitrate=   9.4kbits/s
frame=   85 fps= 23 q=2.5 size=       6kB time=00:00:05.43 bitrate=   8.4kbits/s
frame=   95 fps= 22 q=2.5 size=       6kB time=00:00:05.83 bitrate=   7.8kbits/s
frame=  107 fps= 22 q=2.6 size=       6kB time=00:00:06.33 bitrate=   7.2kbits/s
frame=  117 fps= 22 q=2.7 size=       6kB time=00:00:06.73 bitrate=   6.7kbits/s
frame=  133 fps= 23 q=2.4 size=       6kB time=00:00:07.36 bitrate=   6.2kbits/s
frame=  145 fps= 23 q=2.1 size=       6kB time=00:00:07.83 bitrate=   5.8kbits/s
frame=  160 fps= 23 q=2.7 size=       6kB time=00:00:08.46 bitrate=   5.4kbits/s
frame=  172 fps= 23 q=2.9 size=       6kB time=00:00:08.93 bitrate=   5.1kbits/s
frame=  186 fps= 24 q=2.5 size=       6kB time=00:00:09.50 bitrate=   4.8kbits/s
frame=  200 fps= 24 q=2.7 size=     262kB time=00:00:10.03 bitrate= 213.5kbits/s
frame=  213 fps= 24 q=2.8 size=     262kB time=00:00:10.56 bitrate= 202.8kbits/s
frame=  229 fps= 24 q=2.1 size=     262kB time=00:00:11.20 bitrate= 191.3kbits/s
frame=  239 fps= 24 q=2.5 size=     262kB time=00:00:11.60 bitrate= 184.7kbits/s
frame=  254 fps= 24 q=2.7 size=     262kB time=00:00:12.20 bitrate= 175.6kbits/s
frame=  265 fps= 24 q=1.9 size=     262kB time=00:00:12.63 bitrate= 169.6kbits/s
frame=  280 fps= 24 q=2.8 size=     262kB time=00:00:13.23 bitrate= 161.9kbits/s
frame=  290 fps= 24 q=2.6 size=     262kB time=00:00:13.66 bitrate= 156.8kbits/s
frame=  304 fps= 24 q=3.2 size=     262kB time=00:00:14.20 bitrate= 150.9kbits/s
frame=  315 fps= 24 q=3.2 size=     262kB time=00:00:14.63 bitrate= 146.4kbits/s
frame=  328 fps= 24 q=2.9 size=     262kB time=00:00:15.16 bitrate= 141.3kbits/s
frame=  341 fps= 24 q=3.4 size=     262kB time=00:00:15.70 bitrate= 136.5kbits/s
frame=  352 fps= 24 q=3.2 size=     262kB time=00:00:16.13 bitrate= 132.8kbits/s
frame=  366 fps= 24 q=3.0 size=     262kB time=00:00:16.70 bitrate= 128.3kbits/s
frame=  379 fps= 24 q=2.8 size=     262kB time=00:00:17.20 bitrate= 124.6kbits/s
frame=  395 fps= 24 q=2.7 size=     262kB time=00:00:17.86 bitrate= 119.9kbits/s
frame=  407 fps= 24 q=2.9 size=     518kB time=00:00:18.33 bitrate= 231.3kbits/s
frame=  423 fps= 24 q=3.3 size=     518kB time=00:00:18.96 bitrate= 223.5kbits/s
frame=  436 fps= 24 q=3.1 size=     518kB time=00:00:19.50 bitrate= 217.4kbits/s
frame=  452 fps= 24 q=2.7 size=     518kB time=00:00:20.13 bitrate= 210.6kbits/s
frame=  464 fps= 24 q=2.6 size=     518kB time=00:00:20.60 bitrate= 205.8kbits/s
frame=  480 fps= 25 q=2.8 size=     518kB time=00:00:21.26 bitrate= 199.4kbits/s
frame=  491 fps= 24 q=2.9 size=     518kB time=00:00:21.70 bitrate= 195.4kbits/s
frame=  506 fps= 25 q=3.1 size=     518kB time=00:00:22.30 bitrate= 190.1kbits/s
frame=  517 fps= 24 q=2.5 size=     518kB time=00:00:22.73 bitrate= 186.5kbits/s
 speed=1.08x

内存消耗： 43.4MB
ROM空间： 16.9MB (stripped)
CPU Loading: cat /proc/loadavg（armv7/1.2GHz单核）
1.35 1.54 1.52 1/394 10703 运行前
1.58 1.59 1.54 2/394 11321 运行2分钟后

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ffmpeg

交叉编译