Delphi Posted December 9, 2013 Share Posted December 9, 2013 The problem (they come up too early) occurs when paying back a recorded ts file in DVBViewer. Here a snippet (~73 MB): http://www.a123.dk/temp/antonsen.ts The teletext subtitles are on page 398. When watching live TV there is no problem. The support.zip: http://www.a123.dk/temp/support.zip It has been so for quite some time (more than a year?). Maybe it has something to do with Denmark switching to h.264/MPEG4 for all channels (even SD)? I have tried a lot of settings and tried on different computers, the problem persists. It might not look that bad, but is actually quite annoying and when teletext subtitles are mixed with DVB subtitles the teletext subtitles come on top of the DVB ones making both unreadable. I would realy appreciate a solution to this. TIA Quote Link to comment
Griga Posted December 10, 2013 Share Posted December 10, 2013 In DVBViewer Pro teletext subtitles are not synchronized with audio / video. They are more or less displayed on arrival. I guess they come too early on file playback, which means there is a (relative) delay in audio / video playback, that depends on the used video/audio decoders and renderers. When I play your file in DVBViewer Pro, the sync is quite ok. For comparison you may want to play the file with DVBViewer GE (see customer area, read the ReadMe!). It provides synchronized teletext subs when they are selected from the settings menu. Internally DVBViewer GE uses the broadcasted teletext presentation time stamps (PTS) for this purpose. The implementation has not found its way into DVBViewer Pro yet, but it's on the todo list, and I hope next year we will find time for it. when teletext subtitles are mixed with DVB subtitles the teletext subtitles come on top of the DVB ones making both unreadable. How does this happen? Steps to reproduce the issue? Quote Link to comment
Delphi Posted December 10, 2013 Author Share Posted December 10, 2013 Thanks for the answers! depends on the used video/audio decoders and renderers I have tried to play the file with several combinations of decoders and renderers: no difference here. When I play your file in DVBViewer Pro, the sync is quite ok Here they are 2-4 seconds ahead, which is quite annoying. Consider a quiz show where you get the right answer 4 seconds before the question is actually answered. For comparison you may want to play the file with DVBViewer GE In DVBViewer GE the syncronisation is perfect!!!!! A few seconds make a big difference in viewing experience! Internally DVBViewer GE uses the broadcasted teletext presentation time stamps (PTS) for this purpose. The implementation has not found its way into DVBViewer Pro yet, but it's on the todo list, and I hope next year we will find time for it. Great! Just knowing there might be a solution on the way makes me feel better How does this happen? Steps to reproduce the issue? Here a snippet (DVB subtitles Danish, teletext subtitles page 398): http://www.a123.dk/temp/broen.ts DVBViewer Pro settings: Settings>Options>Subtitles>DVB Subtitles>Language 1>Danish(dan) and check "Enable if available" Now select teletext subtitles page 398 and you will se both types. Quote Link to comment
Delphi Posted December 11, 2013 Author Share Posted December 11, 2013 Just a correction: The claimed DVB subtitles in file broen.ts are NOT DVB subtitles, they are hardcoded into the video, so you don't need Settings>Options>Subtitles>DVB Subtitles>Language 1>Danish(dan) and check "Enable if available" (It IS possible to display both types at the same time that way in DVBViewer Pro) Luckily it means, that I can play this file in DVBViewer GE watching both types of subtitles. Again: The syncronisation is perfect in DVBViewer GE!!! Quote Link to comment
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