smoother play start

[markspieth]

currently on initial AV sync mismatch, AVSync drops or advances frames until stability is reached.

patch comes in 2 parts, independent.

1. discard any initial audio prior to initial video timecode.

2. unpause decoder after all subsystems are running. this reduces the initial AV difference by 1/2 sec thus requiring less time to reach sync equilibrium.

[markspieth]

dump prior audio

[markspieth]

reduce startup avsync mismatch

[J.Pilk@…]

Using 0.24-fixes with dvb-t recording edited by Project-X. Playback start is often messy with several video frames dropped. Go to edit mode, back to start, play,( keys e, PageUp?, e) gives smooth takeup from the intended edit point. Reported ​http://www.gossamer-threads.com/lists/mythtv/users/469368.

Current version info - Fedora 13 x86_64 latest build from ATrpms installed 25 Jan 2011 MythTV Version : v0.24-118-gec67bfb MythTV Branch : fixes/0.24 Network Protocol : 63 Library API : 0.24.20101129-1 QT Version : 4.6.3

[markk]

Mark - these patches seems reasonable and there are no obvious issues in testing. I was however expecting to see more of an impact. I don't for example see any audio packets being dropped in actual usage - from tv to recordings to dvd and bluray.

Given there have been a number of changes in this area in recent times, can you confirm the patches are still behaving as you expect? (or more accurately, giving the desired benefit)

thanks and regards, Mark

[Mark Spieth <>]

AvFormatDecoder?: Discard any initial audio packets prior to initial video timecode.

Refs #9120

Signed-off-by: Mark Kendall <mkendall@…>

Changeset: caf431c7c643040fd646345bbb8c41bb3e77ea13

[Mark Spieth <>]

MythPlayer?: Start the decoder paused and unpause it only when ready.

This has a clear benefit on a number of different recordings and sample clips and often completely eliminates the initial av sync adjustment.

Closes #9120

Signed-off-by: Mark Kendall <mkendall@…>

Changeset: 0b1f9d2b96111a8ec27229945b3d397b5c2a5927