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• Django Celery FFMPEG : convert video files

  3 janvier 2012, par sultan

  I'm trying to convert video files using FFMPEG via Celery tasks. The generated command to be executed looks like

  ffmpeg -i /path/to/flv -ar 22050 -ab 96k -r 24 -b 600k -f flv path/to/flv/transcoded/flv_movie.flv

  and when I call the task TranscodeVideoTask.delay(src=filepath, dst=destination_path)
  I get flv_movie.flv file but its size is only about 200Kb and debug output

  Press [q] to stop, [?] for help
  
  [h264 @ 0x10205a200] Reference 3 >= 3
  
  [h264 @ 0x10205a200] error while decoding MB 7 5, bytestream (690)
  
  [h264 @ 0x10205a200] concealing 762 DC, 762 AC, 762 MV errors
  
  frame=   40 fps=  0 q=2.0 Lsize=     136kB time=00:00:01.66 bitrate= 668.2kbits/s dup=0 drop=9    
  
  video:114kB audio:20kB global headers:0kB muxing overhead 1.814991%

  TranscodeVideoTask source

  @task(name="transcode.media")
  
  def TranscodeVideoTask(src, dst):
  
      command = commands.get("flv") % {"src": src, "dst": dst}
  
      os.system(src, dst)
  
      filename = os.path.join(dst, "flv_movie.flv")
  
      YamdiInjector.yamdi(filename, dst)

  When the same command executed manually in the console it works just fine.

  UPDATE
  So far I've composed the following ffmpeg instructions in my bash file and it converts almost every avi file I tested already

  #!/bin/sh
  
  INPUT=$1
  
  OUTPUT=$2/flv_movie.flv
  
  
  
  echo "Input file: ${INPUT}"
  
  echo "Output file: ${OUTPUT}"
  
  echo `ffmpeg -y -i $INPUT -ar 44100 -ab 128k -ac 2 -sameq -f flv $OUTPUT`

  What may cause this strange problem ?

  Sultan

• ffmpeg - wrong length of video

  29 mars 2012, par Victor

  I use ffmpeg to convert a video from mp4 to flv and mpg formats. Just rough conversion with few params :

   ffmpeg -i my_file.mp4 -an -f flv my_new_file.flv

  (I don't need sound so I specified -an)

  When I convert file with 2:23 length I get 0:23 length of flv(or mpg) files. Why does that happen ?

• Change Audio pitch and add blur effect in video using ffmpeg Php

  29 mars 2012, par santosh yadav

  I have a video clip and i want to change Identity of person on Video,

  For That i want to change pitch of audio and add blur effect on video,

  I have use following things for change pitch but it is not provide better result,

  ffmpeg -i w.mpg -vcodec copy -an tmpVideo.mpg
  
  ffmpeg -i w.mpg tmpAudio.wav
  
  rubberband -p 6 tmpAudio.wav tmpAudioRB.wav
  
  ffmpeg -i tmpVideo.mpg -i tmpAudioRB.wav -vcodec copy finalVideow_6.mpg

  Any Better solution for Change pitch and add blur effect,