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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
- emacs30 presentation: video-audio sync issue,
pinmacs <=