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• C run linux shell command(fmpeg) slower than typing directly in terminal

  11 novembre 2014, par dadylonglegs

  I’m writing an application that execute a linux shell command (ffmpeg) from my C code. Such as :

  char command[2000];
  
  sprintf(command, "ffmpeg -i %s/%s -r 1 -vf scale=-1:120 -vframes 1 -ss  00:00:00 %s.gif", publicFolder, mediaFile, mediaFile);
  
  system(command);

  To extract video thumbnail from a specific video. But the strange that it is too much slower when executing shell command form C compare to typing directly to the terminal. I have no idea about this.
  Can anybody help me pls ?. Thanks in advance.

• Error splitting .mov file with ffmpeg

  5 novembre 2011, par Deepak Lamichhane

  I have used the following ffmpeg command to split the given media file.

  ffmpeg -i test.mov -ss 00:00:00 -t 00:07:00 -acodec copy -vcodec copy test1.mov

  The video "test.mov" has the following characteristics :

  Dimensions: 320 * 240
  
  Codecs: MPEG-4 Video, ACC
  
  Duration: 00:45
  
  Audio channels: 2
  
  Total bit rate: 1,292

  But while splitting it shows the following errors

  FFmpeg version 0.6, Copyright (c) 2000-2010 the FFmpeg developers
  
  built on Apr 29 2011 12:03:13 with gcc 4.2.1 (Apple Inc. build 5664)
  
  configuration: --disable-debug --prefix=/usr/local/Cellar/ffmpeg/0.6 --enable-shared --enable-pthreads --enable-nonfree --enable-gpl --disable-indev=jack --enable-libx264 --enable-libfaac --enable-libfaad --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
  [aac @ 0x10181e200]channel element 1.0 is not allocated
  
      Last message repeated 215 times
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x10180b000]max_analyze_duration reached
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 30000.00 (30000/1) -> 29.97 (30000/1001)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/sts-107-/Dev/cloudfactory/tmp/media/test.mov':
  
    Duration: 00:00:45.14, start: 0.000000, bitrate: 1297 kb/s
  
      Stream #0.0(eng): Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 1195 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc
  
      Stream #0.1(eng): Audio: aac, 0 channels, s16, 97 kb/s
  
  File '/Users/sts-107-/Dev/cloudfactory/tmp/media/ten/ten-1.mov' already exists. Overwrite ? [y/N] y
  
  [mov @ 0x10181cc00]sample rate not set
  
  Output #0, mov, to '/Users/sts-107-/Dev/cloudfactory/tmp/media/ten/ten-1.mov':
  
      Stream #0.0(eng): Video: mpeg4, yuv420p, 320x240 [PAR 1:1 DAR 4:3], q=2-31, 1195 kb/s, 90k tbn, 30k tbc
  
      Stream #0.1(eng): Audio: libfaac, 0 channels, 97 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Could not write header for output file #0 (incorrect codec parameters ?)
  
  ""

  I couldn't figure out whats the problem.

  Any suggestions are most welcome
  Thank you in advance !!!

• How do I debug why avconv is stalling ?

  9 juillet 2015, par Ecommerce Consultant

  I’m converting .mov files to .mpg files using avconv. The command being run by my php application is as follows :

  avconv -y -i ’$finalvideo’ -target ntsc-dvd -aspect 4:3 ’$mpgvideo’ > $logs

  I’m able to convert small .mov files to .mpg without any problems. However, I’m unable to convert videos that are over ten or fifteen minutes long. The log file is completely empty. When I run the command directly the frame stops somewhere around 34000 no matter which video I pick.

  The cpu shows 97% usage on this process, however, nothing is happening.

  OS Ubuntu 10 

  How can I gather more information about this stalled process ?

  Here’s the frozen output

  avconv version 0.7, Copyright (c) 2000-2011 the Libav developers
  
    built on Nov  3 2011 13:39:09 with gcc 4.3.3
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 180000.00 (180000/1) -> 23.98 (24000/1001)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/sites/default/files/compiled_videos/573-stream.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.0.3
  
    Duration: 00:18:53.49, start: 0.000000, bitrate: 1430 kb/s
  
      Stream #0.0(eng): Video: h264 (Main), yuv420p, 854x480, 1387 kb/s, 25.60 fps, 23.98 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 126 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  [buffer @ 0x9d88820] w:854 h:480 pixfmt:yuv420p
  
  [scale @ 0x9d88b60] w:854 h:480 fmt:yuv420p -> w:720 h:480 fmt:yuv420p flags:0x4
  
  Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt'
  
  Output #0, dvd, to '/var/www/sites/default/files/compiled_videos/573.mpg':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 512
  
      compatible_brands: qt  
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.10.0
  
      Stream #0.0(eng): Video: mpeg2video, yuv420p, 720x480 [PAR 8:9 DAR 4:3], q=2-31, 6000 kb/s, 90k tbn, 29.97 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
      Stream #0.1(eng): Audio: ac3, 48000 Hz, stereo, flt, 448 kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Stream mapping:
  
    Stream #0.0 -> #0.0 (h264 -> mpeg2video)
  
    Stream #0.1 -> #0.1 (aac -> ac3)
  
  Press ctrl-c to stop encoding
  
  [mpeg2video @ 0x9d8bf20] rc buffer underflow
  
  Input stream #0.1 frame changed from rate:48000 fmt:s16 ch:2 to rate:48000 fmt:flt ch:2
  
  frame=33910 fps= 91 q=2.0 size=  151922kB time=336.58 bitrate=3697.7kbits/s dup=5475 drop=530    

  Oh interesting. I used -loglevel debug -debug. I was seeing this information

  stream #0:
  
    keyframe=0
  
    duration=0.000
  
    dts=1133.449  pts=1133.533
  
    size=103
  
  *** 1 dup!
  
  stream #0:
  
    keyframe=0
  
    duration=0.000
  
    dts=1133.449  pts=1133.449
  
    size=104

  Until I finally received this message

  *** drop!

  I have posted my bug with libav
  http://bugzilla.libav.org/show_bug.cgi?id=67

  thanks for your help.