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To: Randall Hopper <rhh@ct.picker.com>
cc: multimedia@freebsd.org
Subject: Re: These mtv video pauses are murder 
In-reply-to: Your message of "Sun, 21 Dec 1997 22:20:47 EST."
             <19971221222047.08726@ct.picker.com> 
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Date: Sun, 21 Dec 1997 19:29:13 -0800
From: Amancio Hasty <hasty@rah.star-gate.com>
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Yes, I know about the mtv plus the sound driver issue . Will try again
this week to sort it out with Tristan. We left the issue that Tristan
was supposed to use a new ioctl provided by Hannu once that gets
iron out and it works on linux, I will be happy to implement the
new sound driver ioctl for freebsd.

Got to admit that once fxtv supports YUV it is going to be totally
awesome -- we should try to load up mpeg movies --- for instance
I think that we need a FreeBSD mpeg theme --- Perhaps a Daemon watching
Fxtv 8)

	Cheers,
	Amancio
> 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