[MEncoder-users] Video bitrate 104857 kbps, video GOP is too long.
keenerb at roleplayga.org
Wed Jun 15 19:50:31 CEST 2005
Nico Sabbi wrote:
> Brian Keener wrote:
>> The mpegopts parameter you suggested eliminated the warning from
>> tmpgenc dvd author; thanks for the hint.
>> There are also ffmpeg options for format= and vbitrate=, and since
>> I'm using the libavcodec from ffmpeg, I'm confused as to whether
>> those paramaters are being passed to libavcodec, or are processed
>> internally by mencoder. What would happen if I had vbitrate=7000 in
>> my -lavcopts, and vbitrate=4000 in my -mpegopts parameter?
>> Brian K
> the last element (the muxer) would overwrite the nominal bitrate
> header written
> by the former element (lavc), but the real bitrate is in any case
> entirely dictated by lavc
Ah, I see, the vbitrate in the mpegopts is really only basically what
you want specified in the mpeg "header" then.
Since I hadn't passed that parameter I assume that the vbitrate in the
lavcopts wasn't used as a default value, resulting in a 0 being
inserted. That assumption is borne out by looking at the stream
information in xine when playing the file; it reports bitrate as 0.
Tmpgenc dvd author took that 0 bitrate and basically had no idea how to
I understand now. Maybe.
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