[MPlayer-users] Mencoder: are the displayed bitrates accurate?

gabor gabor at z10n.net
Tue Oct 28 16:17:37 CET 2003


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D Richard Felker III wrote:
|
|>Yes, I understand what a rate is, but a frame can also have a bitrate:
|>the number of bits sent per the duration of the frame. And sadly enough,
|>standalone DVD or VCD players do not care about averaged bitrate (so
|>that mencoder displayed values are maybe not totally useless, but close
|>enough in this case), they expect a certain maxrate to be meet. If you
|>have a higher bitrate even for only one frame, the player won't play it.
|
|
| Not true. You usually go well over the target bitrate for intra
| frames. What matters is that you don't overflow the player's (fairly
| small) buffers, i.e. that you keep time (duration) bounded below for
| the number of bits that fit in the buffer.

is there a standard for how big that buffer has to be?
for example: the buffer is able to contain 1seconds of the video data?

gabor
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