do dropped frames cause audio stuttering

[zedstrange]

When I am doing a capture (from SatTV), I get about 200-300 frames dropped over 30 mins. I dont know whether thats good or bad. In any case the results are quite good though i have to adjust the audio by minus 320ms

However occasionly the audio stutters. reading through the FAQ's i see stuttering mentioned it refers to video only. When this occurs I see no stuttering of video at all, just the audio, and by stutter i mean exactly like this 'stu-stutter'. No audio is actually lost or skipped.

do frames dropping cause an audio stutter like this.

[dar1us]

By weird chance, you arn't capturing at 29.97 FPS in a PAL zone are you?

You must give more details, what kind of hardware you are using, what is the source, i know it is SatTV but how, are you tuned to in via analogue tuner, are u using DVB-S, or a Composite/S-Video out on ure sat box


dar1us

[zedstrange]

Originally posted by dar1us
By weird chance, you arn't capturing at 29.97 FPS in a PAL zone are you?

No , capturing at 25fps pal

Its just a generic question. I gather that some frames are always dropped when capturing however all i want to is does this cuase a stutter. logically if some frames were dropped then audio would also have to be equally dropped if it were to stat in synch and therefore to have audio added (the st-stutter) is not logical

FYI, i am using a Duron 1gb/512mb and 7200rpm hd. Capture card is btree 848, and using one of the modified drivers, forgot which one.
Using Svideo in, no tuner. audio into soundcard, cmedia chipset

capturing at any res causes problem - but normally i use 352*288, same thing at 480*576. i turn off overlay and preview.

Do dropped frames cause audio stutter like this?

[dar1us]

if it dropping the same kind of frames per hour at whatever frametrate, it isn't a hardware(preformance issue) , reinstall your capture drivers. you MUST delete all trace of them before, scan your registry and delete keys that contain config info. one posibility, you have selected the wrong pal type. this might make no difference, but it could, what country are you in?


dar1us

[dar1us]

derr, australia! sorry, the forum doesn't display that after you hit reply..

#Australia...
#
#Pal B/G

for anyone else interested in their countries (proper - not approximate) PAL type, see

PAL http://www.psreporter.com/pal_system_tv_standard.html

and

NTSC http://www.psreporter.com/ntsc_system_tv_standard.html


dar1us

[zedstrange]

Thanks dar1us for the tips.

from reading through all the tips and faq's dropping an occasional frame is quite normal, and not necessarily something that needs to be worried about.

what i really need know is does dropped frames cause audio to stutter in the way i have described?

[zedstrange]

Originally posted by dar1us reinstall your capture drivers. you MUST delete all trace of them before, scan your registry and delete keys that contain config info.[/B]

I replaced my soundcard and the problem seems to have gone away.

[dar1us]

One other thing that you may wish to try, (any one out there with a low-grade sound card) is to capture run your sound and video capture both off the same timer chip (system clock) which should ensure that they run at close enough rates.

The only program I know that you can do this in is iuVCR (in the Interleaving part of the 'Options'), there is probably some universal way to run them from the system timer. I dont ever get dropped frames with my new MSI TV@nywhere but the only problem is my Sound Card keeping up (Live! 1024) and this was all fixed by choosing; Mux Type:Full and System Clock for Audio/Video.

Enjoy