> Hello Scott, > > 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. > ZF, I appreciate the ideas. I have a Creative Labs Audigy SE card and I do see a number of audio devices I could possibly select (0-3). I ran through all the selections within Cinelerra and still get the noise. >From your discussion, I'm not sure I understand exactly how I can tell ALSA to use the hw0 interface. :( More research necessary.
My next step was to use an outboard firewire interface, the MAudio Firewire 410. Unfortunately, as discussed in some recent threads, Fedora 7 has a broken firewire interface. I've seen the results of this myself, when I put my firewire PCI card into the box today and the box rebooted unexpectedly twice in a half hour time period. Nasty. I've investigated some of solutions to the firewire problem, but have not fixed it yet, as it will require some removal/reinstall of a lot of programs. Also, MPEG4 rendering from Cin seems to be broken on F7..probably something to do with the repositories I used for building from source. I like MPEG4 cause it's much faster than H264. So I may go back to FC6, as it was very stable for me. At least I can get the external firewire interface going that way. thanks for the help, scott _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
