Audio p.b. artifacts with video enabled

Geoff_Wood wrote on 8/3/2003, 6:57 AM
Recorded a bunch of small AVIs (30 to 60sec). I think I had the Properties set to Master Stream = none (?), and the audio gets choppy with video playback enabled. If I mute the video track, audio becomes normal.

Is there a setting I can change to make the playback/rendering with audio the priority ? A few frames of video, and overall audio/video synch, is not so important....

It's all a bit of a mental blur, being a 1st-timer wrt video, and I think some subsequent clips were recorded correctly, as they don't exhibit the audio artifacts when played with the video component...

And SF - how about an audio level meter in vidcap40.exe ?!!!

geoff

Comments

farss wrote on 8/3/2003, 7:15 AM
Geoff,
everybody seems to want something during capture!
Problem is when your coming in over DV there is nothing you can adjust, all the capture process is doing is copying data streams.

But how did you cature in the first place? There's no master stream in DV capture from memory.
TorS wrote on 8/3/2003, 7:19 AM
Ah, Geoff, good to see you even here!
While I can't answer your question about priority, the whole thing sounds like what happens when you really need to defrag. You can of course mute track to lighten the load.
Capturing is a straight transfer of data. Even if you could meter the audio, you couldn't do anything about it at that stage.
Tor
Geoff_Wood wrote on 8/3/2003, 3:25 PM
Level meters - but I want something to set the audio level to before I hit the capture button !

Don't think the audio degradation is due to fragmentation, as it comes across in a render. it seems to be that the audio synch to the video gets out of whack - I would prefer to let each 'freewheel'.

The setting I was referring to is Options | Preferences | Capture | Master Stream . Ones done with 'audio' don't have the glitching when played together with the video.


geoff
TorS wrote on 8/3/2003, 4:38 PM
but I want something to set the audio level to before I hit the capture button
Gotta look to your camera for that.

Are you saying the choppyness continues in rendered videos? Or is the choppyness REPEATED there, because the data throughput is still too heavy?

Better keep this thread alive until the SoFo people comes to work tomorrow. Maybe someone can shed some light.
Chienworks wrote on 8/3/2003, 4:56 PM
If i recall correctly, Geoff isn't capturing a DV stream from a firewire connection. He's using an analog capture card in his computer, correct?
TorS wrote on 8/3/2003, 5:03 PM
Oh dear. Analogue !?!?!?
I know Geoff favours old cards (like I do), but DV is digital by its very nature. I didn't know you could capture DV over an analogue connection.
Tor
Chienworks wrote on 8/3/2003, 5:10 PM
TorS, that's the point. I don't believe he is capturing DV.
TorS wrote on 8/3/2003, 5:16 PM
Double Oh Dear.
Well, he's probably fast asleep now, it being very late at his corner of the world. As a matter of fact I'm feeling a little dissy myself ...
Tor
Geoff_Wood wrote on 8/3/2003, 10:17 PM
Yep, *not* DV - AVerMedia capture card from composite. Video looks fine, audio sounds choppy unless video muted.

Choppiness in avi playback from original caputred avi even in media player. Other video captured with different settings does not exhibit problem.

Will defrag, just to be sure that it wasn't to do with disk condition 'when captured'.

But it's like the video is 'pulling' the audio into synch, causing the clicks. I want to break that synch-lynk somehow.

geoff
Chienworks wrote on 8/3/2003, 10:47 PM
Geoff, what format are these files? Did you capture uncompressed at something like 720x480 24 bit 29.97fps? If so, it could be that your computer just doesn't have the power to play these back. They weigh in at around 30MB/second. Try rendering one with the DV AVI template and see how well that plays.
Geoff_Wood wrote on 8/4/2003, 6:17 PM
Problem seems related to how 'zoomed out' the track is. Still a little bit when zoomed fully in, but doesn't get into render then. Didn't try playing in WMP with Vegas shut down though ...

Maybe My Celeron 1G1, 512MB, ATA100, Matrox G450 just can't pump the bytes through quick enough, in some interaction with the graphics ...

Anyway, after a mamoth editing session (until 4:30AM !) finally got the job finished ! Thanks for all you suggestions.

geoff