--- "Scott C. Frase" <[EMAIL PROTECTED]> wrote: > This is a strange one. I've updated the video on my machine, a Dell > SC1430, from the onboard video to an NVidia 8500GT PCI Express card > and > now I get slight audio crackles at different times when playing any > multimedia file, video or audio. The problem seems to occur more if > I > move the mouse or other windows or multitask. If I remove the card > and > return to onboard video, the problem disappears. > > The problem happens in both OSs I've had installed recently, Fedora > Core > 6 and 7. I've moved the audio card to a different slot in the box > and > changed IRQs, but I still get this slight audio distortion with the > new > video card and clean audio when I use the old card. > > I've also put a dual-head VisionTek X1550 card in the box and the > same > audio problem happens. > > I do not see errors in the Cinelerra window or in dmesg output when > the > crackling occurs. > > Has anyone had a similar problem or maybe give me a clue on how I > could > troubleshoot/debug this? It would be nice to have OpenGL and nice > audio > to go along with the nice picture! >
Hello Scott, I do not know if what is written below is of any help but I have experienced a similar problem to what you describe. Similar in a sence that there was some audio distorsion when virtual displays are switched which might be described as crackles... The problem I had is not fixed. My understanding is that it has to do with the audio drivers/hardware, not the video. The audio card has to be fed continuously or crackles will appear. To fix this problem, some data is buffered in the audio card which smooths the sudden short interruptions in data flow. Making this buffer larger, will fix the problem but will delay the audio, as you can imagine. (Probably your video card is holding the PCI bus for too long. I, somehow, thought that PCI Express and PCI are two different busses but maybe they are not..) Now, ALSA driver has somthing which is called hw0 device (I do not exactly understand what this is). Anyway, my understanding is that by default it uses something else and has to be configured to use this hw0. This helps a lot!! but does not guarantee anything. I can not say much more about this. I had only one piece of software which had this problem and it had a switch to use hw:0. With this switch "on", the problem is significanly less noticable. This info is not useful as is, but maybe someone on the list can judge if what I wrote is relevant at all. With best wishes, ZF __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
