Re: [transcode-users] rc buffer underflow with ffmpeg

[achurch@xxxxxxxxxxx (Andrew Church)]

>I was trying to use ffmpeg (instead of mpeg2enc) to encode some clips of 
>stuff I captured & have been getting rc buffer underflow message(s).
[...]
>vrc_maxrate=9800

     Obvious solution: lower vrc_maxrate.  Even the default only puts it
at 9000 kbps, and raising it farther really won't gain you anything
noticeable.  If you continue having problems, lower it even further.  See
also http://www.transcoding.org/cgi-bin/transcode?FFmpeg_Vs._Mpeg2enc

># vrc_buf_size=1792 # suggestion online
>vrc_buf_size=1835 # DVD setting in man page

     1792 is correct, leave it alone.  (The manpage you read probably used
kbit=10^3 bits; this setting uses kbit=2^10 bits.)

  --Andrew Church
    achurch@xxxxxxxxxxx
    http://achurch.org/