[MEncoder-users] Mpeg duration too short

[L. Lee]

On 1/12/12 10:09 AM, "Peter B." <pb at das-werkstatt.com> wrote:

> Zitat von Carl Eugen Hoyos <cehoyos at ag.or.at>:
> 
>>> However, there's an interesting issue caused by FFmpeg: The first
>>> frame of the video is extremely ugly pixelated:
>> 
>> Does this disappear with ffmpeg -threads 1 -i ... -threads 1 out/ffmpeg.mpg ?
>> (with only one of the "-threads 1 ?)
> 
> I've tried both cases: "-threads 1" before input and output file.
> Separately. Still receiving the "rc buffer underflow" warning.
> 
> As suggested, I'll move this issue to ffmpeg-user.
> 
> About the mencoder mpeg-duration issue:
> Anyone else got any hints/infos about why the generated MPEGs are too short?
> 
> Regards,
> Pb
> 

It's PAL and the aspect ratio for the source is obviously wrong. I didn't
see any significant difference in duration between input and output when I
performed this conversion.

http://dl.dropbox.com/u/42718751/vx-04690_01-026s.mpg

mencoder vx-04690_01-026s.avi -oac lavc -channels 2 -o vx-04690_01-026s.mpg
-demuxer lavf -ovc lavc -lavcopts
acodec=ac3:abitrate=320:vqscale=1:mbd=0:vcodec=mpeg2video:aspect=16/9:keyint
=15:vrc_buf_size=1835:vbitrate=7000:vratetol=7000:vrc_maxrate=7500:vrc_minra
te=5000 -mc 0.1 -vf scale=720:480 -of mpeg -mpegopts
format=dvd:tsaf:muxrate=40000 -fps 25 -ofps 25

Laine Lee