Date: Sun, 21 Dec 1997 19:29:13 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Randall Hopper <rhh@ct.picker.com> Cc: multimedia@freebsd.org Subject: Re: These mtv video pauses are murder Message-ID: <199712220329.TAA00402@rah.star-gate.com> In-Reply-To: Your message of "Sun, 21 Dec 1997 22:20:47 EST." <19971221222047.08726@ct.picker.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
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