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View Full Version : Strange muxing issue

PurpleMan
25th November 2006, 20:42
Hello all.

I'm trying to mux a .M2V file I demuxed from a DVD and 2 AC3 files using Muxman.

After I mux, the resulting VOB file plays in a way that the audio starts immidately, but the video is 5 seconds delayed (meaning you see 5 seconds of black frames which are NOT encoded into the VOB or M2V file!)

if I use muxman to create a VOB file without the 2 audio tracks, just video, then the resulting VOB video starts immidiately without the 5 seconds delay.

Any ideas anyone? I mean.. what could possibly cause 5 seconds of black frames to show that are not encoded in the file (frame #1 in the m2v is an actual image), while audio starts okay.

Thanks in advance.
setarip_old
25th November 2006, 22:17
Sounds like your videostream is 5 seconds shorter than your audiostream(s)...
PurpleMan
25th November 2006, 22:39
Nope.. they are the same duration. and besides, if that was true, then Muxman just cuts the audio (I verified that).
PurpleMan
26th November 2006, 09:41
Well as it turns out, this is definitely some sort of bug with muxman. I muxed the exact same files (same m2v, sup, ac3) using ifoedit author mode, and it came out perfect.

Oh well.. :)
Zeul
26th November 2006, 10:30
Strange - I have never encountered this before. You mention in the final post that ifoedit is fine including a sup file. Was the sup file used in muxman (the first post doesn't say so)? If you can replicate then i would suggest you also save the project to a mxp file and post it here, so that we can see if any flags have accidently been set.
PurpleMan
26th November 2006, 14:04
Hi Zeul :)

yes, I muxed the SUPs in the muxman stage too. same mux exactly, except the IFOEDIT one works good. To be honest I never seen anything like this bug.

Anyhow, attached is the project file I used for muxman.

Hope it helps.

(renamed the .mxp to .txt)
Sir Didymus
28th November 2006, 09:29
Something seems odd in your assets: apart the number of audio streams present in the script (they are three and not two), the size of the second, as reported in the script, is:

Size=23808

that, given the framesize of 768 bytes lead to just 31 ac3 audio frames (i.e. less than one second of audio)...

Noticing also (I hope I am not misinterpreting the script...) the presence of closed captions in the video asset...

Not sure about the relationship with the trouble you are facing, however...

What does the muxman.log file say ?

Cheers,
SD