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• ffmpeg hangs when run in background

  25 août 2014, par yoosha

  If I run ffmpeg as follows :

  ffmpeg -i H264-media-4.264 4.avi

  It works OK (i.e. 4.avi created OK). However, if I try to run it in background :

  ffmpeg -i H264-media-4.264 4.avi &

  it hangs ! (and 4.avi never created)
  Any Idea ?

  ---

  Note : The problem is an isolation of of similar problem in python when trying to run it as subprocess and there it hanged as well : ff.py includes

  ps = subprocess.Popen(ffmpeg_list, stderr=subprocess.STDOUT,stdout = subprocess.PIPE)

  and running ./ff.py runs OK, ./ff.py & hangs too.

  • System : CentOS 6.6
  • ffmpeg : 0.10.2

  Results from successful run :

   ffmpeg version 0.10.2 Copyright (c) 2000-2012 the FFmpeg developers
  
   built on Mar 20 2012 04:34:50 with gcc 4.4.6 20110731 (Red Hat 4.4.6-3)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-frei0r --enable-libopencv --enable-libdc1394 --enable-libdirac --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping
  
    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
  
  [h264 @ 0x24eac00] max_analyze_duration 5000000 reached at 5000000
  
  [h264 @ 0x24eac00] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, h264, from 'H264-media-4.264':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (Baseline), yuv420p, 640x480 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
  
  [buffer @ 0x24efa60] w:640 h:480 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
  
  [mpeg4 @ 0x24eb540] removing common factors from framerate
  
  Output #0, avi, to '4.avi':
  
    Metadata:
  
      ISFT            : Lavf53.32.100
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  frame= 2324 fps=477 q=31.0 Lsize=    2603kB time=00:01:32.96 bitrate= 229.4kbits/s    
  
  video:2542kB audio:0kB global headers:0kB muxing overhead 2.409572%

  Results from hanged run :

  ffmpeg version 0.10.2 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Mar 20 2012 04:34:50 with gcc 4.4.6 20110731 (Red Hat 4.4.6-3)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth --enable-frei0r --enable-libopencv --enable-libdc1394 --enable-libdirac --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping
  
    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
  
  
  
  
  
  [5]+  Stopped                 ffmpeg -i H264-media-4.264 4.avi

• Download Video from m3u8 with ffmpeg and multibitrate

  24 avril 2013, par AbrahamSustaita

  I need to download the videos from a streaming site (Akamai) once they are recorded. I can do it with ffmpeg without troubles, but only if the manifest file has only one video stream. If it has multibitrate then I got into problems. Is there anyway I can tell ffmpeg to download one or other video ?

  This is the line I'm using :

  ffmpeg -i http://akamai.link.com/master.m3u8 -acodec copy -vcodec copy  -y -loglevel info -f mp4 destiny.mp4

  EDIT : Adding response :

  This is the file I'm using :

  #EXTM3U
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=714000,RESOLUTION=640x480,CODECS="avc1.77.30, mp4a.40.34"
  
  http://urlAt.akamai.com@channel/index_650_av-p.m3u8?sd=10&rebase=on
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=714000,RESOLUTION=640x480,CODECS="avc1.77.30, mp4a.40.34"
  
  http://urlAt.akamai.com@channel/index_650_av-b.m3u8?sd=10&rebase=on
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=64000,CODECS="mp4a.40.34"
  
  http://urlAt.akamai.com@channel/index_650_a-p.m3u8?sd=10&rebase=on
  
  #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=64000,CODECS="mp4a.40.34"
  
  http://urlAt.akamai.com@channel/index_650_a-b.m3u8?sd=10&rebase=on

  ffmpeg response correctly, but the file is not complete.

  ADDING OUTPUT WITH -map PARAMTER

  dev:/var/www/localhost/htdocs# ffmpeg -map -i simple.m3u8 -acodec copy -vcodec copy  -y -loglevel info -f mp4 simple.mp4
  
  ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Oct 25 2012 08:01:45 with gcc 4.7.2 (Alpine 4.7.2-r0)
  
    configuration: --prefix=/usr --enable-gpl --enable-libmp3lame --enable-libvorbis --enable-libfaac --enable-libvpx --enable-libxvid --enable-libx264 --enable-libtheora --enable-nonfree --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-x11grab --disable-asm --disable-stripping --disable-static --disable-debug
  
    libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Invalid input file index: 0.

• Parsing avconv/ffmpeg rawvideo output ?

  23 avril 2013, par DigitalMan

  I'm about to begin a project that will involve working with the output of avconv/ffmpeg, pixel-by-pixel, in rgb32 format. I intend to work with a raw byte stream, such as from the pipe protocol. Basic pointer arithmetic (C/C++) will be used to iterate over these pixels, and modify them in arbitrary manners in real-time.

  I've created a very small file using rawvideo format and codec, and opened it up in a hex editor. As expected, it's just a series of pixels, read right to left, top to bottom. No distinguishing between lines - no problem, if you know how wide the video is beforehand. No distinguishing between frames - no problem, if you also know how tall the video is. No file header for frame rate, or even what the encoding (rgb32, rgb24, yuv, etc.) is - again, as long as you already know, it can be worked with.

  The problem occurs when - for one reason or another - some bytes are missing. Maybe the stream isn't being examined from the beginning, which is likely be the case in my project, or maybe something just got lost. All the pre-existing knowledge in the world (besides maybe a byte count of what's been missed, not gonna happen) won't prevent it from happily chugging along, with an incorrect offset of line and frame.

  So, what I'm looking for is an option for rawvideo, or possibly some other format/codec, that will allow me to work with the resulting stream at the pixel level, in RGB, yet still have a clear definition of where a new frame begins, even if it happens to start "looking" in the middle of a frame. (Width, height, and framerate will indeed be known.)