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Old 7th May 2005, 05:30   #1  |  Link
bcsman
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Join Date: Jan 2005
Location: Michigan
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DVB movie demuxing problems??

I've tried numerous programs and am having problems demuxing a movie recorded from my DVB card. I first used MyTheater to record the MPEG2 stream and when using both ProjectX and PVAStumento I got lots and lots of dropping GOP messages and the end video was not worth watching. Read where a TS stream was better so installed Alt-DVB and recorded the movie in .ts format. Used ProjectX to demux and once again there were lots and lots of dropping GOP messages. When I got done the 2 hour movie file was compressed into a 33MB file and played like it was being fast forwarded.

Am I doing something substantially wrong here?? My DVB signal is over 90% and when I played the recorded MPEG2 file it was really good straight from the original recording. I don't have anything that plays the .ts file so I'm not sure how that original file looks. ANy help out there??

Do I really have to demux at all or can I just find a program to author the .ts recording because the demuxing appears to be where I'm having my problems??
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Old 7th May 2005, 10:48   #2  |  Link
drmpeg
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Join Date: Jan 2003
Location: Silicon Valley
Posts: 458
ProjectX has a difficult time with certain streams (streams without
any GOP headers and timecode at all, which is legal in MPEG-2, are the
worst) due to it's A/V sync maintenance algorithm (that I believe relies
on GOP timecodes).

You can try my cheapo command line demuxer. It will re-insert missing
GOP timecodes in the demuxed video elementary stream, since many other
authoring tools require GOP headers and timecode. However, it only
does A/V sync at the beginning of the TS file, so it's not as nice
as ProjectX for maintaining A/V sync with bitstreams that have errors.
It can be found here:

http://www.avsforum.com/avs-vb/showt...81#post4615081

If you need any help using the tool, post here.

Ron
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Old 7th May 2005, 10:53   #3  |  Link
buzzqw
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Join Date: Nov 2003
Location: Cesena,Italy
Posts: 6,552
you can also try dgmpegdec 1.3.0

has a very good demux fuction

BHH
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Old 14th May 2005, 02:22   #4  |  Link
yanyani989
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Join Date: May 2005
Location: NYC
Posts: 9
@drmpeg
thank you very much for your program!
I can finally demux my Disc-HD (and occasionally other) stream after days of frustration with ProjectX.
But what would you recommend if I suspect my streams contain errors? (how to check btw?)
I've tried mpeg2repair (http://users.adelphia.net/~mwilczyn/mpeg2/), but tests so far seem to suggest that it worsen the unsynch problem rather than helping. (I tried feeding a few raw and fixed streams to tsdemux then to Mpeg2Schnitt and compare the final product.)

@buzzqw
I've tried DGmpgdec, the demux worked, but when I import into Mpeg2Schnitt, it report error when it came to the end of the stream (the msg is "Fehler bei Bereichsprufung."). Then I tried with Cuttermaran, it imported without problem but when I tried to set cut in, it just keep reporting "No GOP in front of I-frame", no matter where I set it. I guess I know why this is happening after drmpeg's explaination.
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