Help Troubleshooting Sync issues

Swan, I use the "Sync video clock dynamically to audio clock" option in VDub during my caps with Huffyuv. Mind you, I do this with full resolution and 29.97 fps, and full 16bit, 44.1 KHz audio. Watching the info bar on the bottom, I've found that audio frame drops happen very rarely, with only 1 frame being dropped at a time. My soundcard is an old Soundblaster Live PCI card, so it is possible to get decent quality with older stuff. I've never had any sync problems or problems compressing the wav file with Lame. The key is to lower the CPU usage by setting a dedicated capture drive on its own ide or raid channel. My average percentage during caps is 50-60%. Forgot to mention that my capture drive is a 120 GB WD w/ 8MB buffer setup on a Promise Ultra 133 IDE PCI card on the primary master. I use the original VDub by Avery Lee, version 1.4.13 and Huffyuv 2.1.1. OS is Win2k SP3 (WinXp sucks!!), and video is ATI Radeon 8500 DV capturing digital cable signal through S-video and stereo cables. One more note, avoid "Lock video stream to audio stream" at all costs.

>One more note, avoid "Lock video stream to audio stream" at all costs. what's the problem with that? i heard that ADVC has sound problems in that mode... ( ok,ADVC is not same as VD but still could you explain that problem a bit more? )

^^-+I4004+-^^: I think the problem with locking the video to audio is explained on this page. I just quote it here: "The best way to deal with this is slow down or speed up one of the streams, the video stream is the easiest as you have two ways of doing this. 1. Add or drop frames to make the stream longer or shorter effectively speeding up or slowing down the stream. (VirtualDub uses this method) 2. Adjust the frame rate to speed up or slow down the speed of the stream. ..... The big problem you face if you just alter the frame rate is that you can no longer use the video/audio stream to create an SVCD or and VCD as VCD requires a set frame rate of XXX where XXX is 25 for PAL etc. This means you need to use the Dropped frame method to sync the streams if you want to use the capture to create SVCD's" Maybe "Lock video stream to audio stream" alters the Video Framerate.

till now we all now that theory , and we all leave VD's "lock " function unchecked..... video frame alteration is done when this is unchecked too (so it's no that) i think that ( frame drop/add ) is the stuff of "adjust video dynamically to match audio" function....