Live TV Audio/Video Sync (1 Viewer)

[CCob]

Attached is a better fix for the FFDShow video problem - this is a replacement 'TsReader.ax' file.

You need to revert back to the original MP 1.2.0 Beta 'Core.dll' and replace the original TsReader.ax with the new one.

This fix should handle stream corruption/discontinuities properly so A/V sync is maintained.

(I think this *may* work in MP 1.1.3 as well, but I haven't tried it)

Tony

Excellent Owlsroost. I'll try this one tonight. Does it use the same concept as the previous modification, 0.5 secs play and seek back 0.2 secs, or is there some magic being done on the PTS values.

Thanks,
Ceri

 

[Owlsroost]

Excellent Owlsroost. I'll try this one tonight. Does it use the same concept as the previous modification, 0.5 secs play and seek back 0.2 secs, or is there some magic being done on the PTS values.

Thanks,
Ceri

No, it makes sure that the 'discontinuity' flag is set on media samples sent from TsReader to the video decoder just after the start of play, and when incoming stream corruptions occur. This seems to be the only way to force FFDShow video to re-sync it's internal timestamps with the TsReader version.

Tony

 

[Owlsroost]

EDIT: merged this content/attachment into the earlier post

Tony

 

[tony72]

Owlsroost, does the TsReader.ax fix also only do a correction at start of playback like the core.dll workaround, or should it maintain sync on a continuous basis? I took what you said a few posts above to mean the latter, but I may have misunderstood. I was testing it this morning (the _fix_3 version I think), and at some point I lost sync, and it stayed that way until I manually skipped back and forward again. I've only seen that once, but I've only been running that fix for about an hour total, and other than that it's been fine.

 

[Owlsroost]

Owlsroost, does the TsReader.ax fix also only do a correction at start of playback like the core.dll workaround, or should it maintain sync on a continuous basis? I took what you said a few posts above to mean the latter, but I may have misunderstood. I was testing it this morning (the _fix_3 version I think), and at some point I lost sync, and it stayed that way until I manually skipped back and forward again. I've only seen that once, but I've only been running that fix for about an hour total, and other than that it's been fine.

It forces a re-sync just after start-of-play, channel change, skip step and FFWD/REW rate changes. It also forces a re-sync whenever TsReader detects a corrupted packet or other discontinuity in the incoming data stream.

The basic problem with FFDshow video decoder is that it doesn't track the timestamps from TsReader continuously, so if they change substantially it doesn't notice (unless forced to) and we end up with an A/V sync error....

If your problem happens again can you note the time it lost sync and then post the TsReader log, so I can try and see if TsReader logged the discontinuity at that time.

Tony

 

[Owlsroost]

tony72 - quick question - do you have the 'Don't drop discontinued packets in TsReader' box in MP Config (TV Client section) ticked or not ?

Not ticked is the default, and this sstting also means that the video decoder gets the stream discontinuity information.

Tony

 

[pünktchen]

I don't use ffdshow but PDVD Videocodec. On some HD-Channels I often have slowdowns in video. Tried the tsreader-fix and those slowdowns are nearly gone.

Thanks!

Sent from my X10i using Tapatalk

 

[tony72]

tony72 - quick question - do you have the 'Don't drop discontinued packets in TsReader' box in MP Config (TV Client section) ticked or not ?

Not ticked is the default, and this sstting also means that the video decoder gets the stream discontinuity information.

Tony

I don't believe I've ever changed that setting, so it should be at the default, but I'll check this evening when I get home and confirm that, and update this post.

[Edit] Just confirming that the "Don't drop discontinued packets" setting was in the default (unchecked) state. But I haven't lost sync again since that post.

 

[disaster123]

AW: Live TV Audio/Video Sync

@owlroost
could you post patch files for your tsreader versions?

 

[splatterpop]

Hey owlsroost, i tried the tsreader you provided and it works great. It seems the sync problems are gone. Thanks!