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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,

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