Date: Sun, 21 Dec 1997 22:20:47 -0500 From: Randall Hopper <rhh@ct.picker.com> To: Amancio Hasty <hasty@rah.star-gate.com> Cc: multimedia@freebsd.org Subject: These mtv video pauses are murder Message-ID: <19971221222047.08726@ct.picker.com>
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I recorded a few cool 30fps video flicks this evening with this new-found
hard disk access speed. But man! to play 'em back at 30fps, I have to
crank the audio quality down on mtv! Otherwise I get these really nasty
FPS lags (I think you've seen them too).
Really would be cool if we could look at addressing this (BTW, I'm on
3.0-current now with the 971208 SNAP, so I think I've got your latest),
that is, if it is a driver issue and not a mtv bug.
Here's how I run mtv normally (my csh alias):
alias mtv 'mtv -ac0 -aq2 \!*'
I.e. High quality, Stereo. Great sound!, but the FPS lags big time for a
a good many seconds during playback.
Drop down to Low-quality Mono, and hey, the FPS is awesome -- looks like TV!
But the audio track of course sounds like a 1930s AM broadcast. :-(
Medium-quality Stereo and High-quality Mono still lags a good bit, but less
than High-quality Stereo. Medium-quality Mono still lags some -- about
half of the previous two.
So its definitely related to the bandwidth of audio data mtv is trying to
pump into the sound driver. But I guess your previous msgs to/from Tristan
confirmed that -- mtv probably blocking waiting on buffers to free up.
Once we get YUV and mpeg_encode streaming in place in fxtv and have mtv
really cooking with medium- and high-quality audio, MPEGs on FreeBSD will
be _very_ cool.
Later!
Randall
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