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  1. Dear Cats,

    I have try this wrong commandline

    ffmpeg.exe -y -i "V:\100 GOPRO\GOPR2887.MP4" -af "pan=stereo:c0=c0:c1=c1,volume=1.5" -shortest -af apad=whole_len=100000000 -c:a pcm_s16le -ar 48000 out.wav
    trying to encode the audio part only of a gopro audio/video file but I need to encode for a specific duration.

    For example the original duration of my GOPR2887.MP4 is and 27s 27ms (mediainfo) but we suppose that I want encode to a target duration of 0:00:09.480000 seconds OR 525 [correspondant framecount value @ 25fps]

    The original duration have to be fit exactly the target-duration: if necessary ffmpeg should insert silence or have to cut the original audio file to fit for the new duration,

    how can I do?


    ps: please consinder I'm a cat already in a batch file.
    Probably I need to extract the duration from a video (video-only) .avs file and fit tha audio file of the exactly duration of video file
    Last edited by marcorocchini; 2nd Apr 2016 at 17:30.
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  2. -t is duration in ffmpeg,

    -t 00:00:09.480

    A video only avs would be the same length of the video. So if you use trim(0,524) it would be 525 frames . -shortest in ffmpeg will cut to the shortest input length
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  3. Member
    Join Date
    Aug 2014
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    As I told you in the last thread, you should only use one filterchain for audio, so

    ffmpeg.exe -y -i "V:\100 GOPRO\GOPR2887.MP4" -af "pan=stereo:c0=c0:c1=c1,volume=1.5,apad" -c:a pcm_s16le -ar 48000 -t 9.480 out.wav
    (Unless your source has more than 2 channels, that pan command is redundant)
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