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• doc/ffmpeg-filters : add short description

  1er décembre 2012, par Stefano Sabatini

  doc/ffmpeg-filters : add short description

• lavfi/mp : fix invalid read with filters with no argument.

  4 décembre 2012, par Clément Bœsch

  lavfi/mp : fix invalid read with filters with no argument.

• ffmpeg mp4 to mpeg and back again

  5 décembre 2012, par brux

  I am concatenating mp4 files, from research I have found out you must first encode to mpeg and contatenate those, then convert the larger mpeg file back to mp4.

  For simplicity I am just attempting to convert a.mp4 to mpeg and then back to mp4 (i dont need to worry about the concatenation for now)

  Here is how I first convert to my intermediary mpeg from mp4 :

      ffmpeg -i a.mp4 -q:v 2 -vcodec mpeg2video -acodec copy b.mpg

  The file is encoded with no errors, to convert back to mp4 I do :

      ffmpeg -i b.mpg -vcodec libx264 -acodec copy out.mp4

  Everything seems to work with no errors but out.mp4 just plays the first few frames and then freezes, and the time is skipping randomly as the duration passes for the file. No sound is heard also.

      *****************************************                              
  
      Here is the output of the first command
  
      *****************************************
  
  
  
  $ ffmpeg -i a.mp4 -q:v 2 -vcodec mpeg2video -acodec copy b.mpg
  
      ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers
  
        built on Jun 12 2012 20:43:50 with gcc 4.4.3
  
        configuration: --enable-cross-compile --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-3/arch-arm --enable-version3 --enable-gpl --enable-small --enable-memalign-hack --disable-yasm --disable-doc --enable-decoder=mjpeg --enable-decoder=rawvideo --enable-encoder=libx264 --enable-muxer=mp4 --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=mp4 --enable-demuxer=mov --enable-parser=mjpeg --enable-filter=buffer --enable-filter=buffersink --enable-filter=drawbox --enable-filter=overlay --enable-filter=redact --enable-protocol=file --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --extra-cflags=-I../x264 --extra-ldflags=-L../x264 --disabl  libavutil    51. 32. 0 / 51. 32. 0
  
        libavcodec   53. 42. 0 / 53. 42. 0
  
        libavformat  53. 24. 0 / 53. 24. 0
  
        libavfilter   2. 53. 0 /  2. 53. 0
  
        libswscale    2.  1. 0 /  2.  1. 0
  
        libpostproc  51.  2. 0 / 51.  2. 0
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb05a90] multiple edit list entries, a/v desync might occur, patch welcome
  
  
  
      Seems stream 1 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 43.08 (517/12)
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'j.mp4':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 0
  
          compatible_brands: isom3gp4
  
          creation_time   : 1946-12-04 21:52:33
  
        Duration: 00:00:05.31, start: 0.000000, bitrate: 1584 kb/s
  
          Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, s16, 96 kb/s
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : SoundHandle
  
          Stream #0:1(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 720x480, 1599 kb/s, SAR 65536:65536 DAR 3:2, 13.97 fps, 43.08 tbr, 90k tbn, 180k tbc
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : VideoHandle
  
      [buffer @ 0xb247f0] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:65536/65536 sws_param:
  
      [mpeg @ 0xb23d10] VBV buffer size not set, muxing may fail
  
      Output #0, mpeg, to 'out.mpg':
  
        Metadata:
  
          major_brand     : isom
  
          minor_version   : 0
  
          compatible_brands: isom3gp4
  
          creation_time   : 1946-12-04 21:52:33
  
          encoder         : Lavf53.24.0
  
          Stream #0:0(eng): Video: mpeg2video, yuv420p, 720x480 [SAR 65536:65536 DAR 3:2], q=2-31, 200 kb/s, 90k tbn, 50 tbc
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : VideoHandle
  
          Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, 96 kb/s
  
          Metadata:
  
            creation_time   : 1946-12-04 21:52:33
  
            handler_name    : SoundHandle
  
      Stream mapping:
  
        Stream #0:1 -> #0:0 (h264 -> mpeg2video)
  
        Stream #0:0 -> #0:1 (copy)
  
      Press [q] to stop, [?] for help
  
      frame=   20 fps=  0 q=0.0 size=      14kB time=00:00:00.38 bitrate= 301.8kbits/s dup=15 frame=   34 fps= 28 q=0.0 size=     132kB time=00:00:00.66 bitrate=1638.4kbits/s dup=25 frame=   45 fps= 25 q=0.0 size=     230kB time=00:00:00.88 bitrate=2141.1kbits/s dup=33 frame=   55 fps= 22 q=0.0 size=     294kB time=00:00:01.08 bitrate=2230.0kbits/s dup=40 frame=   66 fps= 21 q=0.0 size=     306kB time=00:00:01.21 bitrate=2061.5kbits/s dup=48 frame=   79 fps= 21 q=0.0 size=     436kB time=00:00:01.56 bitrate=2289.6kbits/s dup=57 frame=   88 fps= 20 q=0.0 size=     514kB time=00:00:01.74 bitrate=2419.9kbits/s dup=63 frame=  100 fps= 21 q=0.0 size=     584kB time=00:00:01.98 bitrate=2416.2kbits/s dup=71 frame=  110 fps= 20 q=0.0 size=     618kB time=00:00:02.17 bitrate=2326.6kbits/s dup=78 frame=  116 fps= 19 q=0.0 size=     650kB time=00:00:02.24 bitrate=2377.1kbits/s dup=82 frame=  132 fps= 20 q=0.0 size=     830kB time=00:00:02.62 bitrate=2595.2kbits/s dup=94 frame=  144 fps= 20 q=0.0 size=     904kB time=00:00:02.86 bitrate=2589.4kbits/s dup=103frame=  156 fps= 20 q=0.0 size=     970kB time=00:00:03.10 bitrate=2563.3kbits/s dup=112frame=  168 fps= 20 q=0.0 size=    1006kB time=00:00:03.20 bitrate=2575.4kbits/s dup=121frame=  179 fps= 20 q=0.0 size=    1138kB time=00:00:03.56 bitrate=2618.7kbits/s dup=129frame=  191 fps= 20 q=0.0 size=    1240kB time=00:00:03.80 bitrate=2673.2kbits/s dup=138frame=  203 fps= 20 q=0.0 size=    1342kB time=00:00:04.04 bitrate=2721.2kbits/s dup=147frame=  215 fps= 20 q=0.0 size=    1426kB time=00:00:04.22 bitrate=2765.6kbits/s dup=156frame=  227 fps= 20 q=0.0 size=    1536kB time=00:00:04.52 bitrate=2783.8kbits/s dup=165frame=  239 fps= 20 q=0.0 size=    1646kB time=00:00:04.76 bitrate=2832.8kbits/s dup=174frame=  248 fps= 20 q=0.0 size=    1726kB time=00:00:04.94 bitrate=2862.2kbits/s dup=181frame=  248 fps= 19 q=0.0 Lsize=    1738kB time=00:00:04.94 bitrate=2882.1kbits/s dup=181 drop=0
  
      video:1665kB audio:62kB global headers:0kB muxing overhead 0.639219%
  
  
  
      *****************************************                              
  
      Here is the output of the second command
  
      *****************************************
  
  
  
  $ ffmpeg -i out.mpg -vcodec libx264 -acodec copy out1.mp4
  
      ffmpeg version 0.9, Copyright (c) 2000-2011 the FFmpeg developers
  
        built on Jun 12 2012 20:43:50 with gcc 4.4.3
  
        configuration: --enable-cross-compile --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/home/n8fr8/dev/android/ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/home/n8fr8/dev/android/ndk/platforms/android-3/arch-arm --enable-version3 --enable-gpl --enable-small --enable-memalign-hack --disable-yasm --disable-doc --enable-decoder=mjpeg --enable-decoder=rawvideo --enable-encoder=libx264 --enable-muxer=mp4 --enable-demuxer=image2 --enable-demuxer=mjpeg --enable-demuxer=mp4 --enable-demuxer=mov --enable-parser=mjpeg --enable-filter=buffer --enable-filter=buffersink --enable-filter=drawbox --enable-filter=overlay --enable-filter=redact --enable-protocol=file --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib --extra-cflags=-I../x264 --extra-ldflags=-L../x264 --disabl  libavutil    51. 32. 0 / 51. 32. 0
  
        libavcodec   53. 42. 0 / 53. 42. 0
  
        libavformat  53. 24. 0 / 53. 24. 0
  
        libavfilter   2. 53. 0 /  2. 53. 0
  
        libswscale    2.  1. 0 /  2.  1. 0
  
        libpostproc  51.  2. 0 / 51.  2. 0
  
      [mp1 @ 0xb0d420] Header missing
  
          Last message repeated 8 times
  
      [mpeg @ 0xb05a90] Could not find codec parameters (Audio: mp3, 0 channels, s16)
  
      Input #0, mpeg, from 'out.mpg':
  
        Duration: 00:00:05.24, start: 1.000000, bitrate: 2712 kb/s
  
          Stream #0:0[0x1e0]: Video: mpeg2video, yuv420p, 720x480 [SAR 1:1 DAR 3:2], 104857 kb/s, 50 fps, 50 tbr, 90k tbn, 100 tbc
  
          Stream #0:1[0x1c0]: Audio: mp3, 0 channels, s16
  
      [buffer @ 0xb77ca0] w:720 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
  
      [libx264 @ 0xb0c6e0] using SAR=1/1
  
      [libx264 @ 0xb0c6e0] using cpu capabilities: ARMv6 NEON
  
      [libx264 @ 0xb0c6e0] profile High, level 3.1
  
      [libx264 @ 0xb0c6e0] 264 - core 119 r2113 cc129ad - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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=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 #0, mp4, to 'out1.mp4':
  
        Metadata:
  
          encoder         : Lavf53.24.0
  
          Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 720x480 [SAR 1:1 DAR 3:2], q=-1--1, 50 tbn, 50 tbc
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (mpeg2video -> libx264)
  
      Press [q] to stop, [?] for help
  
      frame=  248 fps=  3 q=31.0 Lsize=     419kB time=00:00:04.92 bitrate= 697.5kbits/s
  
      video:415kB audio:0kB global headers:0kB muxing overhead 0.863133%
  
      [libx264 @ 0xb0c6e0] frame I:3     Avg QP:16.46  size:  3927
  
      [libx264 @ 0xb0c6e0] frame P:102   Avg QP:22.91  size:  3884
  
      [libx264 @ 0xb0c6e0] frame B:143   Avg QP:27.16  size:   116
  
      [libx264 @ 0xb0c6e0] consecutive B-frames: 18.1%  8.9% 18.1% 54.8%
  
      [libx264 @ 0xb0c6e0] mb I  I16..4: 56.3% 42.7%  1.0%
  
      [libx264 @ 0xb0c6e0] mb P  I16..4:  6.1%  9.9%  0.6%  P16..4: 33.2%  4.9%  2.2%  0.0%  0.0%    skip:43.1%
  
      [libx264 @ 0xb0c6e0] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  6.7%  0.0%  0.0%  direct: 0.1%  skip:93.2%  L0:53.5% L1:45.4% BI: 1.2%
  
      [libx264 @ 0xb0c6e0] 8x8 transform intra:57.0% inter:85.5%
  
      [libx264 @ 0xb0c6e0] coded y,uvDC,uvAC intra: 36.0% 71.6% 24.9% inter: 4.4% 11.6% 0.6%
  
      [libx264 @ 0xb0c6e0] i16 v,h,dc,p: 35% 21% 10% 34%
  
      [libx264 @ 0xb0c6e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 22% 34%  3%  3%  4%  2%  4%  5%
  
      [libx264 @ 0xb0c6e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 19% 11%  4% 12% 12%  7%  5%  6%
  
      [libx264 @ 0xb0c6e0] i8c dc,h,v,p: 49% 22% 22%  7%
  
      [libx264 @ 0xb0c6e0] Weighted P-Frames: Y:2.9% UV:2.0%
  
      [libx264 @ 0xb0c6e0] ref P L0: 79.5%  8.1%  9.8%  2.5%  0.0%
  
      [libx264 @ 0xb0c6e0] ref B L0: 91.9%  7.5%  0.6%
  
      [libx264 @ 0xb0c6e0] ref B L1: 94.8%  5.2%
  
      [libx264 @ 0xb0c6e0] kb/s:684.84