Opened 5 years ago
Last modified 12 months ago
#1164 assigned enhancement
av-sync finer tuning
Reported by: | Antoine Martin | Owned by: | Antoine Martin |
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Priority: | major | Milestone: | future |
Component: | sound | Version: | trunk |
Keywords: | Cc: |
Description
Follow up from #835.
Things that we want to quantify because they may need to be taken into account when calculating the video sync delay:
- operating system / driver output buffering: how long it takes from the moment we send bytes to the soundcard until they actually come out of the speakers
- gstreamer internal buffering its sink element, different on each OS
- application specific internal processing delay (which we should probably ignore - the application should submit sound and video in sync to the server OS)
- picture decoding time: this is small, but should have been substracted from the total already
- opengl double-buffering vs single-buffering and framerate (we do have a value for vsync we export) - also needs to be substracted from the total
- any other display specific delay: 4k vs 1080p should not make any difference, at least I can't think of how it would - maybe related to #981
From what I've heard, the audio is a bit late, especially on non-Linux platforms.
If that's the case, we can quite easily add per-OS tweaks.
Change History (9)
comment:1 Changed 5 years ago by
Milestone: | 0.17 → 0.18 |
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comment:2 Changed 5 years ago by
comment:4 Changed 4 years ago by
There may also be differences between codecs, see ticket:1075#comment:10 : Mp3, on the other hand, seemed to be about 6-8 frames audio late.
comment:5 Changed 4 years ago by
Milestone: | 1.0 → 3.0 |
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Not going to happen for this release. Re-scheduling.
comment:6 Changed 3 years ago by
Owner: | changed from alas to Antoine Martin |
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Status: | new → assigned |
As of r17223, users can tune the av-sync from the system tray.
comment:7 Changed 3 years ago by
Milestone: | 3.0 → 3.1 |
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too late for 0.17