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

[Stuart Robinson]

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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.


https://drive.google.com/file/d/1ya2C6JmbBQuRUJ_U-fJT8XODYVw0U1kr/view?usp=sharing
[https://lh3.googleusercontent.com/2Z8CVgH_AoIH1LrOrsKKyOeyPmv6bNovZD9akGxW3FD_b0aqhfwUxCGUHIzzrcPW1Tg=w1200-h630-p]<https://drive.google.com/file/d/1ya2C6JmbBQuRUJ_U-fJT8XODYVw0U1kr/view?usp=sharing>
Test1.dv<https://drive.google.com/file/d/1ya2C6JmbBQuRUJ_U-fJT8XODYVw0U1kr/view?usp=sharing>
drive.google.com
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

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Thanks,

Stuart Robinson,
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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


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Thanks,

        Stuart Robinson,

        AV Technician,

        Sound Lab,

        School of Scottish Studies,

        University of Edinburgh,

        29 George Square,

        Edinburgh,

        EH8 9LD



        0131 651 5001





The University of Edinburgh is a charitable body, registered in

Scotland, with registration number SC005336.