I actually used an 8600 for a few years to do video capture, so I'll describe what I used and why... hopefully it'll be helpful.
Processor... I was using a G3/350 upgrade card. It was a nice speed bump and helped most with the video editing later on (I'd capture uncompressed video, edit the segments together and then apply video compression).
Memory... I had my system at 512 MB of RAM.
Video Memory/display graphics... I used an ATI Rage 128 with 16 MB of memory (pulled from a Blue & White G3 that had a faulty logic board) for my display. I loaded up the onboard graphics memory with 4 MB of VRAM, this is important because if you aren't using any of that memory to run a display... all of it is used for AV processes (like capturing video).
A quick note... this onboard VRAM for AV is the same for the Beige G3 with the AV unit installed. If you install the maximum 6 MB of VRAM and used a display card for your monitor, all that VRAM will be applied to AV tasks.
Hard drive... Larger, faster is better. I used the onboard SCSI hard drive (8 GB) for OS and applications, and had a 80 GB ATA drive connected via an ATA/133 card which was where I directed the raw video to be stored.
Software... I used Strata Videoshop 3.0 (because I had gotten it for free) and later Strata Videoshop 4.5 (which had also become free). I had the full version of Quicktime 5 installed, but all the included codecs are available via Videoshop even if you don't have the full version of Quicktime. I also had Strata MediaPaint for some effects. Later on I got Adobe Premiere 5.1 and After Effects 3.0, but I also made use of Adobe LiveMotion 1.0 (which had a similar interface set up to After Effects).
This system effectively replaced my previous video capture system... an SGI Indy with an Indy Video card and Cosmo Compression card. That system was great at capturing video... but I was limited by the small hard drive (8 GB SCSI) and limited video editing software (I would usually transfer the video to one of my Macs to do any editing or assembling). Generally on that system I was limited to capturing about 6 minutes of video before I ran out of room... I'd usually grab around 15 minute long video segments on my 8600 at the same quality level.
Hope that helps.
Processor... I was using a G3/350 upgrade card. It was a nice speed bump and helped most with the video editing later on (I'd capture uncompressed video, edit the segments together and then apply video compression).
Memory... I had my system at 512 MB of RAM.
Video Memory/display graphics... I used an ATI Rage 128 with 16 MB of memory (pulled from a Blue & White G3 that had a faulty logic board) for my display. I loaded up the onboard graphics memory with 4 MB of VRAM, this is important because if you aren't using any of that memory to run a display... all of it is used for AV processes (like capturing video).
A quick note... this onboard VRAM for AV is the same for the Beige G3 with the AV unit installed. If you install the maximum 6 MB of VRAM and used a display card for your monitor, all that VRAM will be applied to AV tasks.
Hard drive... Larger, faster is better. I used the onboard SCSI hard drive (8 GB) for OS and applications, and had a 80 GB ATA drive connected via an ATA/133 card which was where I directed the raw video to be stored.
Software... I used Strata Videoshop 3.0 (because I had gotten it for free) and later Strata Videoshop 4.5 (which had also become free). I had the full version of Quicktime 5 installed, but all the included codecs are available via Videoshop even if you don't have the full version of Quicktime. I also had Strata MediaPaint for some effects. Later on I got Adobe Premiere 5.1 and After Effects 3.0, but I also made use of Adobe LiveMotion 1.0 (which had a similar interface set up to After Effects).
This system effectively replaced my previous video capture system... an SGI Indy with an Indy Video card and Cosmo Compression card. That system was great at capturing video... but I was limited by the small hard drive (8 GB SCSI) and limited video editing software (I would usually transfer the video to one of my Macs to do any editing or assembling). Generally on that system I was limited to capturing about 6 minutes of video before I ran out of room... I'd usually grab around 15 minute long video segments on my 8600 at the same quality level.
Hope that helps.