Hey, On 2001.10.04 10:21:56 +0200 Neologism wrote: > So I'm wondering what the next step up from a DC10+ may be. Would it be > a frame grabbing board without any hardware compression, and then > performing all of the compression in software as described by the > VCR-HOWTO? [VCR-HOWTO - Using your GNU/Linux computer as a > VCR--http://www.linuxdoc.org/HOWTO/VCR-HOWTO.html] It's hard to track > down any quality information about the frame grabbing boards. That would be the opposite. The whole idea of the hardware compression is to get high encoding quality without having a high CPU usage (uninterrupted, so less lost frames). So according to this idea, the DC10+ should produce better quality recordings then a "cheap TV-card" (no flame intended ;-) ). If you have a fast computer, your computer will be able to do the encoding in software with no problems but even then, I doubt whether quality would be any better compared to hardware encoding.. Probably not. You can, of course, try to record uncompressed frames but your harddisk is not gonna like it. These recordings produce an enormous data stream, so it's really a question whether your HD can handle it. Secondly, your HD will be full within no-time. However, the best quality recording will always be uncompressed recording ;-). > I don't have any experience with DV, but I'm guessing it's higher quality DV is pretty high quality (better than MJPEG from the DC10+), but still, the files are a lot larger than MJPEG files. If you don't mind about filesize, you can try DV. If you'd rather have smaller recordings, stick to MJPEG. MJPEG recordings can be optimized (higher quality, no decimated capture, but not too high because then, the card might not be able to handle it and you'll get illegal JPEG frames) and some JPEG-specific artifacts can be handled with some of our tools. With yuvdenoiser (in the CVS), for example, you can denoise the JPEG-frame-noise. I'd be interested to see your "artifacts", we might be able to improve lavrec, driver or other tools that cause them if we know what exactly causes it, so please give some closer info on this (screenshots/frames/video, recording parameters, hardware, kernel/driver version, mjpegtools version, ...). Please note that things like mainboard can also matter here. My parents' Buz on a Via mainboard gives pretty low-quality results when recording/viewing video - I'm really thinking this is because of the mainboard... My own Abit BH6 gives nearly perfect recording results. There's some more info on hardware-experiences and such in Rainer Johanni's old Buz FAQ (https://sourceforge.net/docman/display_doc.php?docid=3320&group_id=5776). Although that only applies to the Buz, it's probably also interesting for DC10+ owners. Ronald -- - .-. - /V\ | Ronald Bultje <rbultje@xxxxxxxxxxxxxxxxxxx> - // \\ | Running: Linux 2.4.4 and OpenBSD 2.8 - /( )\ | http://ronald.bitfreak.net/ - ^^-^^
