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emacs30 presentation: video-audio sync issue


From: pinmacs
Subject: emacs30 presentation: video-audio sync issue
Date: Fri, 3 Jan 2025 15:08:55 +0100

Hi emacsconf team and Philip,

Thanks for the wonderful presentation on emacs 30 new features. It is great and I learnt so many cool things from there.

I would like to report on a problem so
After minute 9-10 I started to perceive an audio-video sync problem

Let me prove it with this clear example:

    If you go to 16:20 Philip talks and types "with naaatiive coompilation", but it says it (and you heard the typing) in 16:31, that's make it little bit harder to follow on certain parts of the video that are more interactive/dynamic or less static, I think that the de-sync problem grows more and more as the video follows,

This happens in the default video and the youtube version, I suspect that is a problem from the source

Nice, the sync problem can be perceived with the media-info command (see duration video vs audio) [1], and looks like youtube tried to force its resolution (I mean, it is still desynced, but not reported by metadata) [2], I suggest that you do a quick test to find other media with this problem and add it as a sanity check.

Cheers,
pinmacs

[1]

[2025-01-03 Fri 13:47:48] $ mediainfo emacsconf-2024-emacs30--emacs-30-highlights--philip-kaludercic--main.webm | grep Duration
Duration                                 : 24 min 55 s
Duration                                 : 24 min 43 s
Duration                                 : 24 min 55 s
Duration                                 : 24 min 43 s

[2]

[2025-01-03 Fri 13:48:27] $ mediainfo EmacsConf_2024_-_Emacs_30_Highlights_-_Philip_Kalu.webm | grep Duration
Duration                                 : 24 min 55 s
Duration                                 : 24 min 55 s
Duration                                 : 24 min 55 s



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