[MPlayer-users] [BUGS] Problems with MPlayer 1.0pre7 mpeg muxer

[Nico Sabbi]

Giacomo Comes wrote:

>The new mpeg muxer present in MPlayer 1.0pre7 and current CVS
>does not create correct mpegs in two different cases.
>
>
>Problem 1.
>NTSC DVD mpegs are not correctly multiplexed.
>
>Example:
>mencoder -of mpeg -mpegopts format=dvd -ovc lavc -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:keyint=18:vrc_maxrate=7500:vbitrate=7500 -o NTSC.mpg -ofps 30000/1001 source.avi -vf scale=720:480,harddup -oac lavc -lavcopts acodec=ac3:abitrate=192
>dvdauthor -o DVD NTSC.mpg
>
>dvdauthor (0.6.11) will output these messages:
>(be sure to make a 60 seconds or longer mpeg)
>
>STAT: fixing VOBU at 28MB (81/223, 35%)
>WARN: audio sector out of range: -8217 (vobu #92, pts 24.724)
>WARN: audio sector out of range: -8372 (vobu #93, pts 25.024)
>WARN: audio sector out of range: -8504 (vobu #94, pts 25.325)
>etc.
>
>The dvd disc will play on some dvd player but will not play on some others.
>It will have some other problems too.
>
>Temporary solution to problem 1:
>remultiplex the video and audio streams with mplex.
>
>
>
>  
>

acknowledged

>Problem 2.
>mpegs telecined AND with B-frames does not play on some hardware DVD player.
>
>Example:
>mencoder -of mpeg -mpegopts format=dvd:telecine -ovc lavc -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:keyint=12:vrc_maxrate=7500:vbitrate=7500:vmax_b_frames=2 -o NTSC.mpg -ofps 24000/1001 source.avi -vf scale=720:480,harddup -oac lavc -lavcopts acodec=ac3:abitrate=192
>
>On my DVD player, DVD and SVCD telecined and with B-frames created with mencoder
>do not play correctly (sync problem).
>The same DVD player plays fine the same kind of mpegs created with 
>mpeg2enc/mplex.
>
>Temporary solution to problem 2:
>Make telecined mpegs without B-frames or non telecined mpegs with B-frames.
>
>  
>


I ran several tests today, using my muxer and mplex.
I didn't see any major difference in the pts/dts couples (at most in the 
order of 3 ms)
and not even any major difference of desynchronization playing the two 
streams on TV.
To generate the video stream I used only mencoder with your settings, 
not mpeg2enc,
otherwise I coulnd't have a common factor for a serious comparison.

Can you send me some samples, please?


>Nico Sabbi is already aware of the bugs, but it is busy at present and
>he could not be able to fix them soon.
>The purpose of this post is to inform other users about the existence of
>the problems.
>
>Giacomo
>
>  
>
Bye,

    Nico