After recording, using 2 pass h264 in handbrake at900abr cut it down without losing qualityĪll that. I'm using 22Khz pcm audio with no ill effects. Increasing the abr to 3000 or 4000 solved the problem completely.
After reading an article (highly recommended) about how h264 works, I realised I wasn't giving it enough bits to work. Ultrafast is needed to get it encoding fast enough (to keep up sync with audio).
I like the simple HD options - they work well. If I was using straight PCM - 22Khz, 16bit mono - would the audio still be potentially one of the issues? although with fast motion (like scrolling down a page) I'm getting a lot of blocking and lost/confusing motion. Although, in the config options for x264vfw I changed the preset to ultrafast and it starting syncing properly last night. I think the encoding speed may just be too slow for real time capture, and so the video is coming out a little behind the audio (same result for my old core duo laptop, and my i5 laptop). I did read somewhere that its best to have the framerate as close to your actual capture rate (for me its between 7-10fps showing on the camstudio window) - is this actually important? Unfortunately that isn't the issue for me - I've been using 30, 50, 20 as my settings. It made a lot more sense when I read that the two have to mathematically match. Thanks for your help - I've done a bit of reading / research into the problem and have played around with those settings.
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