Camy's Thang!!!

just for you camy, i've posted in flash fiction.jason

It's not just Canon camcorders, it's not just Final Cut, audio sync seems to be a problem generally - and I haven't got it cracked. I used to have a PC with a digital TV tuner card which could schedule and record TV programmes. Very successful so long as I then watched the programmes on the PC. But if I burned them to DVD the audio sync always went adrift. Sometimes by several seconds. Hilarious. Never got to the bottom of it, although there are lots of techie websites devoted to advice on the subject. Use a very fast PC seems to be the best advice....You've put it in writing now, so you've got to do it. NaNoWriMo in November here we come! Go get last year's finished, I'll work on finishing mine and we'll both be raring to go by Nov 1st.Now go give M a big hug and tell him it's from your webmates.Bruin

just for you camy, i've posted in flash fiction.jason

WOW!!! Thanks, Jason! I say wow because 'Struggling to See the Light' is excellent. My hat is doffed.

You've put it in writing now, so you've got to do it. NaNoWriMo in November here we come! Go get last year's finished, I'll work on finishing mine and we'll both be raring to go by Nov 1st.

Aye aye!

Now go give M a big hug and tell him it's from your webmates.

It'll be a pleasure!

Ah yes, audio sync. The perenial and neverending problem of video. I've been tackling it for years, and still haven't got a full-proof system. But here's a few thoughts,1) Capture both the video and the audio is as uncompressed a format as possible. For the video stream I generally use MJPEG or Huffyuv, and for the audio PCM. This puts a reduced strain on your CPU, making desyncing less likely.It also gives you frame-accurate editing, and if the audio does wind up shifted forward or back - or worse, stretched or squashed in duration relative to the video - it's easier to correct.2) Sometimes audio capture settings just work better on some capture card than other settings. I once had a system where the audio always progressively lagged behind the video when it was recorded at 44.1MHz in mono. But it synced perfectly when recording in 48MHz and stereo. The reason was that some audio codecs have a slightly different idea about what 44.1MHz exactly means than some others.3) If possible, interleave the audio and video streams tightly - I use a 10ms interleave, which is four interleaves per second at 25fps. If you can't do this at the capture state, you can use VirtualDub to save an interleaved copy of the capture, and also shift the audio forward or back if you need to.