[FFmpeg-user] DV playback rate issues, timecode is invalid

Stuart Robinson Stuart.Robinson at ed.ac.uk
Tue Jan 24 16:23:38 EET 2023

From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> on behalf of Stuart Robinson <Stuart.Robinson at ed.ac.uk>
Sent: 19 January 2023 09:04
To: ffmpeg-user at ffmpeg.org <ffmpeg-user at ffmpeg.org>
Subject: [FFmpeg-user] DV playback rate issues, timecode is invalid

I am having terrible trouble with a long play DV I have captured that I am trying to transcode. It seems to be playing back slowly regardless of what I've tried. The original also plays back strangely, it was captured with ffmpeg from a dv camcorder.

Can someone take a look and let me know what might help? Are the first few frames throwing it off somehow?

Thanks for any help.




Stuart Robinson,
It looks as though this was an issue with the audio changing from 4ch 32kHz to 2 ch 48kHz at the start of the track due to a faulty recording (though it may also have had changes to the video stream), can the aac decoder accept changes?

Answering in case anyone else has similar problems, I ended up re-capturing the file skipping out the bad patch at the start when the change happens.




        Stuart Robinson,

        AV Technician,

        Sound Lab,

        School of Scottish Studies,

        University of Edinburgh,

        29 George Square,


        EH8 9LD

        0131 651 5001

The University of Edinburgh is a charitable body, registered in

Scotland, with registration number SC005336.

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