I.MX6 FFmpeg 录制视频

/*************************************************************************
 *                     I.MX6 FFmpeg 录制视频
 * 说明：
 *     通过FFmpeg录制视频是很正常的事，测试一下。
 *
 *                                   2017-2-10 深圳 南山平山村 曾剑锋
 ************************************************************************/

一、 参考文档：
    . FFmpeg 录制桌面、麦克风、摄像头
        http://blog.csdn.net/candcplusplus/article/details/53955012

二、测试命令：
    ffmpeg -f video4linux2 -t  -i /dev/video1 -vcodec libx264 -f mp4 test1.mp4

三、视频录制信息：
    # ffmpeg -f video4linux2 -t  -i /dev/video1 -vcodec libx264 -f mp4 test1.mp4
    ffmpeg version 3.2 Copyright (c) - the FFmpeg developers
      built with gcc 4.8. (Sourcery CodeBench Lite 2014.05-)  (prerelease)
      configuration: --enable-cross-compile --cross-prefix=/home/aplex/tinyfs/buildroot-2016.11./output/host/usr/bin/arm-none-linux-gnueabi- --sysroot=/home/aplex/tinyfs/buildroot-2016.11./output/host/usr/arm-buildroot-linux-gnueabi/sysroot --host-cc=/usr/bin/gcc --arch=arm --target-os=linux --disable-stripping --pkg-config=/home/aplex/tinyfs/buildroot-2016.11./output/host/usr/bin/pkg-config --disable-static --enable-shared --prefix=/usr --enable-avfilter --disable-version3 --enable-logging --enable-optimizations --disable-extra-warnings --enable-avdevice --enable-avcodec --enable-avformat --disable-x11grab --enable-network --disable-gray --enable-swscale-alpha --enable-filter=scale --disable-small --enable-dct --enable-fft --enable-mdct --enable-rdft --disable-crystalhd --disable-dxva2 --enable-runtime-cpudetect --disable-hardcoded-tables --disable-memalign-hack --disable-mipsdsp --disable-mipsdspr2 --disable-msa --enable-hwaccels --disable-avisynth --disable-frei0r --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libcdio --disable-libdc1394 --disable-libgsm --disable-libilbc --disable-libnut --disable-libopenjpeg --disable-libschroedinger --disable-libvo-amrwbenc --disable-symver --disable-doc --enable-gpl --disable-nonfree --enable-ffmpeg --enable-ffplay --enable-ffserver --disable-avresample --disable-ffprobe --enable-postproc --enable-swscale --enable-indevs --enable-outdevs --enable-pthreads --enable-zlib --enable-bzlib --disable-libfdk-aac --disable-gnutls --disable-openssl --disable-libopenh264 --disable-vaapi --disable-vdpau --disable-libopencv --disable-libopus --disable-libvpx --disable-libass --disable-libbluray --disable-librtmp --disable-libmp3lame --disable-libmodplug --disable-libspeex --disable-libtheora --disable-libwavpack --enable-libfreetype --disable-fontconfig --enable-libx264 --enable-libx265 --disable-yasm --disable-mmx --disable-sse --disable-sse2 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-avx --disable-avx2 --enable-armv6 --disable-vfp --disable-neon --disable-altivec --enable-pic --cpu=cortex-a9
      libavutil      . 34.100 / . 34.100
      libavcodec     . 64.100 / . 64.100
      libavformat    . 56.100 / . 56.100
      libavdevice    .  1.100 / .  1.100
      libavfilter     . 65.100 /  . 65.100
      libswscale      .  2.100 /  .  2.100
      libswresample   .  3.100 /  .  3.100
      libpostproc    .  1.100 / .  1.100
    Input #, video4linux2,v4l2, from '/dev/video1':
      Duration: N/A, start: 1190.523607, bitrate:  kb/s
        Stream #:: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480,  kb/s,  fps,  tbr, 1000k tbn, 1000k tbc
    File 'test1.mp4' already exists. Overwrite ? [y/N] y
    No pixel format specified, yuv422p for H. encoding chosen.
    Use -pix_fmt yuv420p for compatibility with outdated media players.
    [libx264 @ 0x4c450] using cpu capabilities: ARMv6 NEON
    [libx264 @ 0x4c450] profile High ::, level 3.0, :: -bit
    [libx264 @ 0x4c450]  - core  - H./MPEG- AVC codec - Copyleft - - http://www.videolan.org/x264.html - options: 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=3 lookahead_threads=1 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
    Output #, mp4, to 'test1.mp4':
      Metadata:
        encoder         : Lavf57.56.100
        Stream #:: Video: h264 (libx264) ([][][][] / 0x0021), yuv422p, 640x480, q=---,  fps,  tbn,  tbc
        Metadata:
          encoder         : Lavc57.64.100 libx264
        Side data:
          cpb: bitrate max/min/avg: // buffer size:  vbv_delay: -
    Stream mapping:
      Stream #: -> #: (rawvideo (native) -> h264 (libx264))
    Press [q] to stop, [?] for help
    frame=    fps=  q=29.0 size=     121kB time=::00.96 bitrate=.8kbits/frame=    fps=  q=29.0 size=     122kB time=::01.13 bitrate= .9kbits/frame=    fps=  q=29.0 size=     123kB time=::01.36 bitrate= .4kbits/frame=    fps=  q=29.0 size=     124kB time=::01.63 bitrate= .4kbits/frame=   fps=  q=29.0 size=     124kB time=::01.80 bitrate= .0kbits/frame=   fps=  q=29.0 size=     219kB time=::07.06 bitrate= .1kbits/frame=   fps=  q=29.0 size=     219kB time=::07.20 bitrate= .7kbits/frame=   fps=  q=29.0 size=     220kB time=::07.60 bitrate= .2kbits/frame=   fps=  q=29.0 size=     220kB time=::07.76 bitrate= .4kbits/frame=   fps=  q=29.0 size=     221kB time=::07.93 bitrate= .8kbits/frame=   fps=  q=29.0 size=     246kB time=::08.30 bitrate= .5kbits/frame=   fps=  q=29.0 size=     246kB time=::08.60 bitrate= .6kbits/frame=   fps=9.6 q=-1.0 Lsize=     451kB time=::10.30 bitrate= .4kbits/s dup= drop= speed=.319x
    video:446kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.000611%
    [libx264 @ 0x4c450] frame I:     Avg QP:25.07  size:
    [libx264 @ 0x4c450] frame P:    Avg QP:18.96  size:
    [libx264 @ 0x4c450] frame B:   Avg QP:27.88  size:
    [libx264 @ 0x4c450] consecutive B-frames:  1.6%  1.3%  1.0% 96.2%
    [libx264 @ 0x4c450] mb I  I16..: 23.5% 52.4% 24.1%
    [libx264 @ 0x4c450] mb P  I16..:  1.9%  3.5%  0.7%  P16..: 17.1%  2.9%  2.5%  0.0%  0.0%    skip:71.4%
    [libx264 @ 0x4c450] mb B  I16..:  0.0%  0.1%  0.0%  B16..: 10.4%  0.6%  0.1%  direct: 1.2%  skip:87.5%  L0:40.9% L1:56.1% BI: 3.1%
    [libx264 @ 0x4c450] 8x8 transform intra:55.4% inter:83.9%
    [libx264 @ 0x4c450] coded y,uvDC,uvAC intra: 48.3% 88.0% 59.2% inter: 2.4% 9.2% 2.3%
    [libx264 @ 0x4c450] i16 v,h,dc,p: % %  % %
    [libx264 @ 0x4c450] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: % % %  %  %  % %  %  %
    [libx264 @ 0x4c450] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: % % %  %  %  % %  %  %
    [libx264 @ 0x4c450] i8c dc,h,v,p: % % %  %
    [libx264 @ 0x4c450] Weighted P-Frames: Y:2.5% UV:1.3%
    [libx264 @ 0x4c450] ref P L0: 56.2% 11.0% 24.4%  7.7%  0.6%
    [libx264 @ 0x4c450] ref B L0: 75.6% 21.6%  2.8%
    [libx264 @ 0x4c450] ref B L1: 91.8%  8.2%
    [libx264 @ 0x4c450] kb/s:350.88
    # ls
    test1.mp4
    #