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• ubuntu ffmpeg filters

  29 décembre 2012, par DmitryR

  I'm converting video using ffmpeg on ubuntu.
  Console output is :

  ffmpeg version 0.8.4-4:0.8.4-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Nov  6 2012 16:51:33 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [libspeex @ 0x1ed9560] Missing Speex header, assuming defaults.
  
  [flv @ 0x1ed57a0] decoding for stream 0 failed
  
  [flv @ 0x1ed57a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from '/data/media/hdfvr_temp/videoStream_1355078401768_654.flv':
  
    Metadata:
  
      creationdate    : Sun Dec 9 18:40:13
  
    Duration: 00:00:03.00, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: [0][0][0][0] / 0x0000, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: libspeex, 16000 Hz, 1 channels, s16
  
  [buffer @ 0x1ed94a0] Invalid pixel format string '-1'
  
  Error opening filters!

  What filters does it want ?
  It was installed by sudo apt-get install ffmpeg, LTS 12.04

  Update : command is ffmpeg -i input.flv output.mp4

• I want use ffmpeg record mp3 in command line but get Unknown input format : 'oss' error

  28 décembre 2012, par user504909

  my ffmpeg version is :

  ffmpeg version N-48238-g10a3fa8 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Dec 27 2012 16:14:07 with gcc 4.7.2 (GCC)

  use cmd in windows :

  ffmpeg.exe -f oss -i dsp.mp3

  output :

  libavutil      52. 12.100 / 52. 12.100
  
  libavcodec     54. 81.100 / 54. 81.100
  
  libavformat    54. 50.102 / 54. 50.102
  
  libavdevice    54.  3.102 / 54.  3.102
  
  libavfilter     3. 30.101 /  3. 30.101
  
  libswscale      2.  1.103 /  2.  1.103
  
  libswresample   0. 17.102 /  0. 17.102
  
  libpostproc    52.  2.100 / 52.  2.100
  
  Unknown input format: 'oss'

  list all format for "output" :

  ffmpeg.exe -formats | grep "output"

  (I installed the cygwin, so can use grep in window command)
  output :

   E caca            caca (color ASCII art) output device
  
  DE rtp             RTP output
  
  DE rtsp            RTSP output
  
  DE sap             SAP output
  
   E sdl             SDL output device

  I just want record the audio from my mic, how to use command line to do it ?

• Call ffmpeg in c++ with system() function fails

  2 septembre 2014, par zhen lee

  I write a c++ program which needs to convert some(say:10) mp4 videos to flv videos.
  I use ffmpeg in my program for each video like this :

  system("ffmpeg -i video -filter:v yadif -ar 44100 -sameq -y -f flv temp.flv")

  however,it turns out :only first video will be converted successfully,the others will fail.
  it means :
  when i change the input order of which video to convert and re-execution the program,it behave the same:only the first video(will be different each time as i changed the input video order) will be converted successfully.

  The error message like :

  [h264 @ 0xaee0740] concealing 45 DC, 45 AC, 45 MV errors
  [h264 @ 0xaee0ce0] AVC : nal size 305665
  Last message repeated 1 times
  [h264 @ 0xaee0ce0] no frame !
  [h264 @ 0xaee1280] AVC : nal size 572993
  Last message repeated 1 times
  [h264 @ 0xaee1280] no frame !
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  ......
  The most strange thing is :when i run ffmpeg command in bash shell,all video will be converted successfully .

  After google it,I have try these(certainly failed) :

  1. remove -sameq option,the result is same ;

  2. write ffmpeg commod in a shell script ConvertToFlv.sh like :

     /usr/local/bin/ffmpeg -i "$dir/$1" -filter:v yadif -ar 44100 -sameq -y -f flv "$dir/temp.fiv"

     then call this script in program like

     system("ConvertToFlv.sh"+video)

     or

     system("sh ConvertToFlv.sh"+video)

     The result is same.

  The ffmpeg configure is :

    ffmpeg version 0.9.1.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Dec 17 2012 16:17:30 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
  
    configuration: --enable-gpl --enable-postproc --enable-nonfree --enable-postproc --enable-swscale --enable-avfilter --enable-pthreads --enable-libxvid --enable-libx264 --enable-libmp3lame --enable-libfaac --disable-ffserver --disable-ffplay
  
    libavutil      51. 41.100 / 51. 41.100
  
    libavcodec     54.  4.100 / 54.  4.100
  
    libavformat    54.  1.100 / 54.  1.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 62.101 /  2. 62.101
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  7.100 /  0.  7.100
  
    libpostproc    52.  0.100 / 52.  0.100

  and my machine envirment is :

  Linux master 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

  I’m irritable now,I hope someone can give me some advice,really appreciate it.