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  1. Member
    Join Date
    Dec 2006
    Location
    Bangladesh
    Search Comp PM
    i am having issue, to concat video, it looses the audio sync and audio started from previous video.

    here is the code i am trying:

    1: re-encode file a (1):

    Code:
    ffmpeg.exe -i "f:\1.avi" -af apad -vf scale=1280:720 -crf 15.0 -vcodec libx264 -acodec aac -ar 48000 -b:a 192k -coder 1 -rc_lookahead 60 -threads 0 -shortest -avoid_negative_ts make_zero -fflags +genpts 01.mp4
    2: re-encode file b (2):

    Code:
    ffmpeg.exe -i "f:\2.mp4" -af apad -vf scale=1280:720 -crf 15.0 -vcodec libx264 -acodec aac -ar 48000 -b:a 192k -coder 1 -rc_lookahead 60 -threads 0 -shortest -avoid_negative_ts make_zero -fflags +genpts 02.mp4
    3: Now contact using following command:

    Code:
    ffmpeg.exe -f concat -safe 0 -i "f:\files.txt" -c copy test.mp4
    but audio is not synced with video ;(

    i also uploaded both video (and also the output) on dropbox:

    Video Sync Issue Source And Result Files

    so, any help, how to make audio perfectly sync with video would be great
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  2. You need to match the framerate of the 1st file (e.g. add -r 25 as an output option)

    Code:
    ffmpeg.exe -i "f:\1.avi" -r 25 -af apad -vf scale=1280:720 -crf 15.0 -vcodec libx264 -acodec aac -ar 48000 -b:a 192k -coder 1 -rc_lookahead 60 -threads 0 -shortest -avoid_negative_ts make_zero -fflags +genpts 01.mp4
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  3. Member
    Join Date
    Dec 2006
    Location
    Bangladesh
    Search Comp PM
    Originally Posted by poisondeathray View Post
    You need to match the framerate of the 1st file (e.g. add -r 25 as an output option)
    oh! man, i was so dumb, i was concerned about same frame/video size, codec etc, but forgot about the frame rate and passed too many hours to figure out ;(

    thanks a lot you have saved my day.

    You OWE me 1 ton of thanks..

    best regards
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