[MEncoder-users] Flashvideo for YouTube using mencoder

[Ben]

On Fri, Feb 22, 2008 at 5:18 PM, Reimar Döffinger
<Reimar.Doeffinger at stud.uni-karlsruhe.de> wrote:

>  Uh... I thought it was rather obvious that the question is quality _at a
>  fixed bitrate_.

Not entirely by the way, the YouTube low-quality requirement
is a maximum of 349 kbit/s (for both Audio + Video).
When I put less keyframes in, the videorate lowers,
for example from 262 to 200 kbit/s which is wasting
62 kbit/s of room for extra quality, obviously.
So this is not working with a fixed bitrate, but with a maximum.

Check out what Jeroen Wijering (we all know him from his
great free flashplayer code) has to say about it:
http://www.jeroenwijering.com/?item=FLV_Video_Compression
He prefers a keyframe every 2 seconds.
I usually keep it around 6 seconds. So, for a 25 fps flashvideo
my preferred keyint is 140.

Regards,

JB