On Fri, 31 Dec 2004, Adam Gautier wrote:
> I am getting an underun error and warning that exists when mplex(ing) 1
> set of audio and video files that was rendered from cinelerra. The info
> on the render setting is:
>
> Video:
> Type: MPEG-1
> Bitrate: 1000000 (fixed)
Ok, "generic MPEG-1" at a 1Mb/s rate. That does seem a bit low
for 800x600.
> $ mplex -o 3mintest.mpeg final.m1v final.mp3
> INFO: [mplex] Frame width : 800
> INFO: [mplex] Frame height : 600
> INFO: [mplex] Audio version : 1.0
> INFO: [mplex] Layer : 3
> INFO: [mplex] CRC checksums : no
> INFO: [mplex] Bit rate : 16384 bytes/sec (128 kbit/sec) INFO:
Ah, so the video is for "computer playback" only. That's not a
framesize that is suitable for VCD/DVD use (and MP3 audio couldn't be
used for (S)VCD or DVD)
> INFO: [mplex] New sequence commences...
> INFO: [mplex] Video e0: buf= 47104 frame=000000 sector=00000000 INFO:
> [mplex] Audio c0: buf= 4096 frame=000000 sector=00000000 INFO:
> [mplex] Padding : sector=00000000
> ++ WARN: [mplex] Stream e0: data will arrive too late sent(SCR)=26798
> required(DTS)=26798
> The man page suggests that I reduce the input bitrate or increase the
> output bitrate. But, I am new to video/audio editing and I am a little
> out of my league. What do I need to do the get these files to mplex
> together?
mplex -f 0 -r 1200 -o 3mintest.mpg final.m1v final.mp3
should work better. What is needed is the "-r" option that is the
sum of the audio and video bitrates plus a little extra to account
for overhead and peaks. If you still get an underrun error or two
try bumping up the value used with -r to 1300.
Cheers,
Steven Schultz
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