dvbcut-user  

Re: [DVBCUT-user] dvbcut muxer and mp2 sound

Michael Riepe
Thu, 13 Aug 2009 03:12:07 -0700

Hi!

Juergen Bausa wrote:
> It seems that the dvbcut muxer has problems with mp2 tracks. I had the 
> following problem 
> with movies from german channel Pro7: After cutting out the comercial breaks 
> and burning to dvd,
> video and audio are choppy after a certain cutpoint on standalone dvd players 
> (I tested to 
> different models). mpg file and dvd run ok with mplayer. The problem occurs 
> only, if
> 
> - The .rec file has mp2 and ac3 audio and only mp2 is exported (if ac3 or mp2 
> + ac3 are 
> exported, everything is ok). I didnt experience the problem, when the 
> rec-file has only mp2
> audio tracks.

If you export both audio tracks, the player probably uses the AC-3
track. Can you please verify if the mp2 track is okay in that case?

> - It only occurs if the dvbcut muxer is used (libavformat muxer works ok)
> 
> - It only occurs for certain cutpoints. If the cutpoint is changed by one 
> frame, it still exists. 
> But if the cutpoint is changed by some frames, it may be gone.

Does it depend on the frame type (I/P/B) of the cutpoint?

> - If the problem occurs at some comercial break (does not need to be the 
> first one), the rest of 
> the movie is choppy. Everything before that point is ok.
> 
> I had this problem with two movies from Pro7. In the last years I made a lot 
> of dvds from Pro7 
> movies. However, I normally use ac3 and mp2 tracks. This might be the reason, 
> why the problem 
> didnt come up before.

My first guess is that it's a timestamp or buffering/bitrate problem.
But I'm afraid that it will be hard to debug.

-- 
Michael "Tired" Riepe <mich...@mr511.de>
X-Tired: Each morning I get up I die a little

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