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  • ffmpeg HLS creation and segmentation results in "cannot decode" on iPad

    5 mai 2014, par jt_dylan

    I have the following code that plays on Mac Safari :

        
    
       
    
       
    
       
    

    
    <video controls="controls" width="480" height="270">
    
    
    
    <source src="http://d1ckv7o9k6o3x9.cloudfront.net/d54cfa01-eff2-4e86-946e-dc8b2ee4a7e8/media/  hls/MVI_5927.m3u8">
    
    </source></video>

    The url can be cut/pasted into the browser and works also but neither this code nor the url works in Windows Safari or iPad. Specifically on iPad I receive a cannot decode error. On Mac I have Quicktime installed so I tried that on Windows with no luck. The link that can be play on Mac is below.

    http://d1ckv7o9k6o3x9.cloudfront.net/d54cfa01-eff2-4e86-946e-dc8b2ee4a7e8/media/hls/MVI_5927.m3u8

    Browser Versions of software :
    Mac Safari : Version 7.0.3 (9537.75.14) (works)
    Windows Safari : Version 5.1.7 (7534.7.2) (doesn’t work - blank screen)
    iPad Safari : ios Version 7.1.1 (doesn’t work - cannot decode)

    Here is how I’m creating my mp4 (lgpl)
    I’m creating an mp4 with this command :
    ffmpeg -i input.mov c:v mpeg4 q:v 1 test.mp4

    I’m creating the hls using ffmpeg lpgl with this command :

    ffmpegcmd -re -y -i test.mp4 -map 0 -f segment -segment_list test.m3u8 -segment_list_flags +live -segment_time 1 -segment_list_type m3u8 test%05d.ts 2>&amp;1

    Now this works in Mac Safari with Quicktime installed but results in "cannot decode" if I try the url from ipad Safari.

    I then tried with libx264 to create the mp4 as h.264 with aac and then copy to mpeg2 container as follows :

    ffmpeg -i test.mov  -c:v libx264 -c:a libfdk_aac -preset slower -b:a 240k test.slower.mp4
    
ffmpeg -i test.slower.mp4 -vcodec copy -f mpegts -bsf h264_mp4toannexb test.slower.ts
    
ffmpeg -re -y -i test.slower.ts -map 0 -f segment -segment_list test.slower.m3u8 -segment_list_flags +live -segment_time 1 -segment_list_type m3u8 test.slower.%05d.ts

    This still produces the same results. Any idea what is wrong here ?

    Any help is much appreciated.

    Regards,
    jt_dylan

    Output from libx264 commands below :

    ffmpeg -i test.mov  -c:v libx264 -c:a libfdk_aac -preset slower -b:a 240k test.slower.mp4
    

    
ffmpeg version git-2014-05-04-aeeb3d4 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on May  4 2014 17:01:19 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
    
  configuration: --prefix=/home/ec2-user/ffmpeg_build --extra-cflags=-I/home/ec2-user/ffmpeg_build/include --extra-ldflags=-L/home/ec2-user/ffmpeg_build/lib --bindir=/home/ec2-user/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
    
  libavutil      52. 81.100 / 52. 81.100
    
  libavcodec     55. 60.103 / 55. 60.103
    
  libavformat    55. 37.102 / 55. 37.102
    
  libavdevice    55. 13.101 / 55. 13.101
    
  libavfilter     4.  5.100 /  4.  5.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tst/MVI_1716.MOV':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537331968
    
    compatible_brands: qt  CAEP
    
    creation_time   : 2012-07-21 05:17:44
    
  Duration: 00:00:20.06, start: 0.000000, bitrate: 34471 kb/s
    
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuvj420p(pc, smpte170m), 1920x1080, 33663 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 48k tbc (default)
    
    Metadata:
    
      creation_time   : 2012-07-21 05:17:44
    
    Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, mono, s16, 768 kb/s (default)
    
    Metadata:
    
      creation_time   : 2012-07-21 05:17:44
    
No pixel format specified, yuvj420p for H.264 encoding chosen.
    
Use -pix_fmt yuv420p for compatibility with outdated media players.
    
[libx264 @ 0x39ae9e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
    
[libx264 @ 0x39ae9e0] profile High, level 5.0
    
[libx264 @ 0x39ae9e0] 264 - core 142 r2 ac76440 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=8 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=9 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=2 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=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=60 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 'tstconv/MVI_1716.slower.mp4':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537331968
    
    compatible_brands: qt  CAEP
    
    encoder         : Lavf55.37.102
    
    Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p, 1920x1080, q=-1--1, 24k tbn, 23.98 tbc (default)
    
    Metadata:
    
      creation_time   : 2012-07-21 05:17:44
    
    Stream #0:1(eng): Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 48000 Hz, mono, s16, 240 kb/s (default)
    
    Metadata:
    
      creation_time   : 2012-07-21 05:17:44
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> libx264)
    
  Stream #0:1 -> #0:1 (pcm_s16le -> libfdk_aac)
    
Press [q] to stop, [?] for help
    
frame=  481 fps=1.5 q=-1.0 Lsize=   18428kB time=00:00:20.07 bitrate=7519.9kbits/s    
    
video:17827kB audio:589kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.060811%
    
[libx264 @ 0x39ae9e0] frame I:3     Avg QP:23.31  size:113718
    
[libx264 @ 0x39ae9e0] frame P:135   Avg QP:25.06  size: 56912
    
[libx264 @ 0x39ae9e0] frame B:343   Avg QP:27.13  size: 29825
    
[libx264 @ 0x39ae9e0] consecutive B-frames:  1.2%  4.2% 20.6% 74.0%
    
[libx264 @ 0x39ae9e0] mb I  I16..4: 20.0% 53.3% 26.6%
    
[libx264 @ 0x39ae9e0] mb P  I16..4:  9.7% 22.8%  5.4%  P16..4: 41.0%  8.6%  5.4%  0.1%  0.0%    skip: 7.0%
    
[libx264 @ 0x39ae9e0] mb B  I16..4:  3.3%  7.2%  2.0%  B16..8: 40.7%  9.8%  1.7%  direct: 6.3%  skip:29.0%  L0:49.6% L1:44.7% BI: 5.7%
    
[libx264 @ 0x39ae9e0] 8x8 transform intra:58.9% inter:70.2%
    
[libx264 @ 0x39ae9e0] direct mvs  spatial:99.4% temporal:0.6%
    
[libx264 @ 0x39ae9e0] coded y,uvDC,uvAC intra: 58.6% 46.9% 7.3% inter: 23.9% 20.2% 0.2%
    
[libx264 @ 0x39ae9e0] i16 v,h,dc,p: 10% 64% 14% 12%
    
[libx264 @ 0x39ae9e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 50% 10%  3%  4%  3%  8%  4% 12%
    
[libx264 @ 0x39ae9e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  4% 64%  5%  2%  3%  2%  6%  2% 10%
    
[libx264 @ 0x39ae9e0] i8c dc,h,v,p: 35% 53%  9%  3%
    
[libx264 @ 0x39ae9e0] Weighted P-Frames: Y:11.1% UV:4.4%
    
[libx264 @ 0x39ae9e0] ref P L0: 47.8% 12.2% 15.8%  6.8%  5.7%  4.2%  4.3%  2.6%  0.6%  0.0%
    
[libx264 @ 0x39ae9e0] ref B L0: 76.8% 10.5%  5.1%  2.9%  2.2%  1.5%  0.9%
    
[libx264 @ 0x39ae9e0] ref B L1: 94.6%  5.4%
    
[libx264 @ 0x39ae9e0] kb/s:7279.24
    

    
ffmpeg -i test.slower.mp4 -vcodec copy -f mpegts -bsf h264_mp4toannexb test.slower.ts
    

    
ffmpeg version git-2014-05-04-aeeb3d4 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on May  4 2014 17:01:19 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
    
  configuration: --prefix=/home/ec2-user/ffmpeg_build --extra-cflags=-I/home/ec2-user/ffmpeg_build/include --extra-ldflags=-L/home/ec2-user/ffmpeg_build/lib --bindir=/home/ec2-user/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
    
  libavutil      52. 81.100 / 52. 81.100
    
  libavcodec     55. 60.103 / 55. 60.103
    
  libavformat    55. 37.102 / 55. 37.102
    
  libavdevice    55. 13.101 / 55. 13.101
    
  libavfilter     4.  5.100 /  4.  5.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tstconv/MVI_1716.slower.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf55.37.102
    
  Duration: 00:00:20.11, start: 0.042667, bitrate: 7508 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080, 7279 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 240 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
[swscaler @ 0x367c0c0] deprecated pixel format used, make sure you did set range correctly
    
Output #0, segment, to 'MVI_1716.slower.%05d.ts':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf55.37.102
    
    Stream #0:0(eng): Video: mpeg2video, yuv420p, 1920x1080, q=2-31, 200 kb/s, 90k tbn, 23.98 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: mp2, 48000 Hz, mono, s16, 384 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (h264 -> mpeg2video)
    
  Stream #0:1 -> #0:1 (aac -> mp2)
    
Press [q] to stop, [?] for help
    
frame=  482 fps= 24 q=31.0 Lsize=N/A time=00:00:20.12 bitrate=N/A dup=1 drop=0    
    
video:8293kB audio:944kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 195032183209984.000000%
    
ffmpeg version git-2014-05-04-aeeb3d4 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on May  4 2014 17:01:19 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
    
  configuration: --prefix=/home/ec2-user/ffmpeg_build --extra-cflags=-I/home/ec2-user/ffmpeg_build/include --extra-ldflags=-L/home/ec2-user/ffmpeg_build/lib --bindir=/home/ec2-user/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
    
  libavutil      52. 81.100 / 52. 81.100
    
  libavcodec     55. 60.103 / 55. 60.103
    
  libavformat    55. 37.102 / 55. 37.102
    
  libavdevice    55. 13.101 / 55. 13.101
    
  libavfilter     4.  5.100 /  4.  5.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'tstconv/MVI_1716.slower.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf55.37.102
    
  Duration: 00:00:20.11, start: 0.042667, bitrate: 7508 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080, 7279 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 240 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
File 'tstconv/MVI_1716.slower.ts' already exists. Overwrite ? [y/N] y
    
Output #0, mpegts, to 'tstconv/MVI_1716.slower.ts':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf55.37.102
    
    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuvj420p, 1920x1080, q=2-31, 7279 kb/s, 23.98 fps, 90k tbn, 23.98 tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(eng): Audio: mp2, 48000 Hz, mono, s16, 384 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (aac -> mp2)
    
Press [q] to stop, [?] for help
    
frame=  481 fps=0.0 q=-1.0 Lsize=   20334kB time=00:00:20.12 bitrate=8276.6kbits/s    
    
video:17827kB audio:944kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 8.325850%
    

    
ffmpeg -re -y -i test.slower.ts -map 0 -f segment -segment_list test.slower.m3u8 -segment_list_flags +live -segment_time 1 -segment_list_type m3u8 test.slower.%05d.ts
    

    
ffmpeg version git-2014-05-04-aeeb3d4 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on May  4 2014 17:01:19 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
    
  configuration: --prefix=/home/ec2-user/ffmpeg_build --extra-cflags=-I/home/ec2-user/ffmpeg_build/include --extra-ldflags=-L/home/ec2-user/ffmpeg_build/lib --bindir=/home/ec2-user/bin --extra-libs=-ldl --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
    
  libavutil      52. 81.100 / 52. 81.100
    
  libavcodec     55. 60.103 / 55. 60.103
    
  libavformat    55. 37.102 / 55. 37.102
    
  libavdevice    55. 13.101 / 55. 13.101
    
  libavfilter     4.  5.100 /  4.  5.100
    
  libswscale      2.  6.100 /  2.  6.100
    
  libswresample   0. 18.100 /  0. 18.100
    
  libpostproc    52.  3.100 / 52.  3.100
    
Input #0, mpegts, from 'tstconv/MVI_1716.slower.ts':
    
  Duration: 00:00:20.11, start: 1.430733, bitrate: 8282 kb/s
    
  Program 1 
    
    Metadata:
    
      service_name    : Service01
    
      service_provider: FFmpeg
    
    Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuvj420p(pc), 1920x1080, 23.98 fps, 23.98 tbr, 90k tbn, 47.95 tbc
    
    Stream #0:1[0x101](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, mono, s16p, 373 kb/s
    
[swscaler @ 0x1fe9ae0] deprecated pixel format used, make sure you did set range correctly
    
    Output #0, segment, to 'MVI_1716.slower.%05d.ts':
    
      Metadata:
    
        encoder         : Lavf55.37.102
    
        Stream #0:0: Video: mpeg2video, yuv420p, 1920x1080, q=2-31, 200 kb/s, 90k tbn, 23.98 tbc
    
        Stream #0:1(eng): Audio: mp2, 48000 Hz, mono, s16, 384 kb/s
    
    Stream mapping:
    
      Stream #0:0 -> #0:0 (h264 -> mpeg2video)
    
      Stream #0:1 -> #0:1 (mp2 -> mp2)

  • Carrierwave-video "Process hung" error while encoding uncompressed video files

    28 avril 2014, par Cramps

    I have an API for a mobile app that accepts video uploads. This app is for both iOS and Android devices, so for video compatibility’s sake these videos are encoded to H.264 once uploaded to the server using carrierwave-video (ffmpeg wrapper gem for Ruby on Rails). Right now this seems to be working, and videos are uploaded and encoded and can be played in both Android and iOS devices. However, sometimes the process hangs while encoding heavy (uncompressed ?) video files, usually 10+ seconds long. This is the output of ffmpeg :

    Failed to transcode with FFmpeg.
    
Check ffmpeg install and verify video is not corrupt or cut short.
    
Original error: Process hung. Full output:

    (That’s it, the full output seems empty.)

    These are the encoding parameters I’m using in my Carrierwave Uploader :

    encode_video(:mp4, custom: '-y -vcodec libx264 -acodec libfaac -vpre ultrafast 2> /home/user/log/ffmpeg.log, resolution: '640x640')

    According to the SuperUser question I linked above a solution would be to encode the video twice, once to AVI for compression(?) and then encode to MP4. I don’t know if that would work, but I don’t know how to do this either in my uploader. I would have to encode the output video file of my first (AVI) encoding process.

    Now that there’s some context, my question is : How can I solve this "Process hung" error ?

    In case the answer to that is to go with this double encoding method suggested, how can I achieve this using Carrierwave-video ?

    One last note is that if I try to encode these videos using ffmpeg straight from command-line the videos encode and playback successfully.

    Thank you for your time !

    PD : Wasn’t sure if I should add ruby-on-rails tag. I’ll remove it if necessary !

    Edit
    This is what I get from ffmpeg -i filename.mp4

    ffmpeg version 0.10.3 Copyright (c) 2000-2012 the FFmpeg developers
    
  built on Apr 30 2013 11:26:53 with gcc 4.5.4
    
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-O2 -march=athlon64 -pipe' --extra-cflags='-O2 -march=athlon64 -pipe' --extra-cxxflags='-O2 -march=athlon64 -pipe' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --disable-stripping --disable-debug --disable-doc --disable-vaapi --disable-vdpau --disable-ffplay --enable-openssl --enable-nonfree --enable-libmp3lame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libaacplus --enable-nonfree --enable-libfaac --enable-nonfree --disable-indev=v4l --disable-indev=v4l2 --disable-indev=alsa --disable-indev=oss --disable-indev=jack --disable-outdev=alsa --disable-outdev=oss --disable-outdev=sdl --enable-pthreads --enable-libopencore-amrwb --enable-libopencore-amrnb --enable-libvpx --enable-libope  libavutil      51. 35.100 / 51. 35.100
    
  libavcodec     53. 61.100 / 53. 61.100
    
  libavformat    53. 32.100 / 53. 32.100
    
  libavdevice    53.  4.100 / 53.  4.100
    
  libavfilter     2. 61.100 /  2. 61.100
    
  libswscale      2.  1.100 /  2.  1.100
    
  libswresample   0.  6.100 /  0.  6.100
    
  libpostproc    52.  0.100 / 52.  0.100
    

    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/user/api/uploads/tmp/e54zfghzt9.mp4':
    

    

    
Metadata:
    
    major_brand     : isom
    
    minor_version   : 0
    
    compatible_brands: isom3gp4
    
    creation_time   : 2014-04-23 14:56:19
    
  Duration: 00:00:14.27, start: 0.000000, bitrate: 20757 kb/s
    
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 20993 kb/s, SAR 65536:65536 DAR 16:9, 30 fps, 30 tbr, 90k tbn, 180k tbc
    

    

    
Metadata:
    
      creation_time   : 2014-04-23 14:56:19
    
      handler_name    : VideoHandle
    
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 190 kb/s
    

    

    
Metadata:
    
      creation_time   : 2014-04-23 14:56:19
    
      handler_name    : SoundHandle

    Then it just starts buffering as such :

    time=00:00:13.20 bitrate=2533.2kbits/s    
    
frame=  405 fps=  7 q=24.0 size=    4083kB time=00:00:13.20 bitrate=2533.2kbits/s    
    
frame=  407 fps=  7 q=24.0 size=    4083kB time=00:00:13.20 bitrate=2533.2kbits/s    
    
frame=  409 fps=  7 q=24.0 size=    4083kB time=00:00:13.20 bitrate=2533.2kbits/s    
    
frame=  412 fps=  7 q=24.0 size=    4083kB time=00:00:13.20 bitrate=2533.2kbits/s    
    
frame=  417 fps=  7 q=24.0 size=    4083kB time=00:00:13.20 bitrate=2533.2kbits/s    
    
frame=  417 fps=  7 q=24.0 Lsize=    4194kB time=00:00:13.90 bitrate=2471.5kbits/s    
    
video:3957kB audio:223kB global headers:0kB muxing overhead 0.310939%
    
[libx264 @ 0x7f28327ccc50] frame I:2     Avg QP:21.50  size: 25120
    
[libx264 @ 0x7f28327ccc50] frame P:415   Avg QP:25.32  size:  9642
    
[libx264 @ 0x7f28327ccc50] mb I  I16..4: 35.8%  0.0% 64.2%
    
[libx264 @ 0x7f28327ccc50] mb P  I16..4:  8.4%  0.0%  3.2%  P16..4: 43.6% 19.0%  5.6%  0.0%  0.0%    skip:20.2%
    
[libx264 @ 0x7f28327ccc50] coded y,uvDC,uvAC intra: 45.2% 53.6% 27.3% inter: 39.4% 27.6% 2.7%
    
[libx264 @ 0x7f28327ccc50] i16 v,h,dc,p: 28% 57% 11%  5%
    
[libx264 @ 0x7f28327ccc50] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 66% 11%  1%  1%  1%  2%  1%  2%
    
[libx264 @ 0x7f28327ccc50] i8c dc,h,v,p: 23% 58% 17%  3%
    
[libx264 @ 0x7f28327ccc50] kb/s:2331.88

    `

  • avconv "select" filter doesn't discard first frames

    1er avril 2014, par user2152106

    I'm trying to segment a video using avconv's "select" filter to extract only a specific range of frames from the input file. As an example, imagine I have a 60fps video file called input.mp4, with 3000 frames (i.e. 50 seconds), and I run

    avconv -i input.mp4 -vf "select=&#39;lt(n,2000)&#39;" output1.mp4
    
avconv -i input.mp4 -vf "select=&#39;gte(n,2000)&#39;" output2.mp4

    What I expect is that output1.mp4 has the first 2000 frames of input.mp4 (and lasts 33 seconds), and output2.mp4 has the last 1000 (and lasts 17 seconds).

    I count the frames by running

    avconv -i video.mp4 -vcodec copy -an -f null /dev/null 2>&amp;1 | grep &#39;frame=&#39;

    and checking the value assigned to 'frame'.

    What I actually get, is that output1.mp4 has 2000 frames and lasts 33 seconds, but output2.mp4 has 2999 frames, and still lasts the full 50 seconds. When I open output2.mp4, I notice that the first 2000 frames of the video are actually just a repetition of the 2000th frame of the input, i.e. the first 2000 frames seem to be correctly filtered, but replaced by the first of the accepted frames.

    This is not a pts problem. I check the number of packets and their relative pts using avprobe :

    avprobe -show_packets output2.mp4
    
echo $(avprobe -show_packets output2.mp4 2>/dev/null | grep PACKET | wc -l)/2 | bc

    I see that there are actually 2999 packets.

    What am I doing wrong ?

    Side questions :

    • Assuming I'm doing something wrong, why does output2.mp4 contain 2999 rather than the full 3000 ?
    • The behaviour doesn't change whether I use the "gte" or "gt" function in the filter. Why could that be ?

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