[MEncoder-users] DVD compliant MPEG2 encoding

[Nico Sabbi]

Lauri Myllari wrote:

>
>>Do you have this problem with or without B-frames (or both)?
>>I have observed this only with B-frames.
>>    
>>
>
>Both. Here's how to reproduce (using the same source as the beginning
>of thread):
>
>% mencoder kingdom_of_heaven_m720p.mov -o video_me256_0bf.mpg -nosound -noskip -ofps 24000/1001 \
>-ovc lavc -of mpeg -mpegopts format=dvd:vaspect=16/9:telecine -vf expand=1280:720,scale=720:480 \
>-lavcopts vcodec=mpeg2video:keyint=15:vbitrate=1800:vrc_buf_size=1835:vrc_maxrate=9000:aspect=16/9:me_range=256:vmax_b_frames=0
>% mencoder kingdom_of_heaven_m720p.mov -o video_me256_1bf.mpg -nosound -noskip -ofps 24000/1001 \
>-ovc lavc -of mpeg -mpegopts format=dvd:vaspect=16/9:telecine -vf expand=1280:720,scale=720:480 \
>-lavcopts vcodec=mpeg2video:keyint=15:vbitrate=1800:vrc_buf_size=1835:vrc_maxrate=9000:aspect=16/9:me_range=256:vmax_b_frames=1
>
>I had to use -nosound, otherwise I get a lot of errors like "ERROR: SCR:
>228288961, APTS: 204226560, DELTA=-0.261 secs, COMPENSATE=7310, BR:
>28000, lens: 2016/2016, frames: 2".
>
>The resulting files are accepted by dvdauthor without any warnings.
>Playback starts ok, then starts skipping a bit, then almost jumping and
>the first stream hangs before end. Second one actually finishes, but
>the video has nasty jumps.
>
>Curiously, if I multiplex audio into these clips, it doesn't stutter
>during playback (maybe the audio stutter was because of wrong me_range).
>Video is still the same and the first clip hangs.
>
>The only way I can make good NTSC streams is using mencoder for video,
>DGpulldown.exe or pulldown.exe for 3:2 pulldown, mplex for multiplexing
>with audio and then dvdauthor.
>  
>

can you try to mux the pulldown-ed m2v using  mencoder only as a muxer:
-of mpeg -mpegopts format=dvd:telecine:vaspect=16/9 -ovc copy -oac copy
and report, please?

>Does anybody have an analyzer that could peek into differences between
>pulldown by mencoder and pulldown.exe? Perhaps the video problems are
>related to the APTS-SCR errors when trying to encode both video and
>audio? (Or have these been solved already and I've just missed some
>documentation?)
>
>--rez
>  
>

mpeg2desc < file.mpg|less