Thursday, April 13, 2006

audio/video sync problems..first complete editing job completed

After struggling with video/audio synchronization issues, I've finally got 56 minutes of passable video. Due to my own stupidity (the fact that my Audio-Technica AT822 stereo mic was attached to, but not plugged in to the video cam) and that the audio coming from the cam is pretty lousy, I needed to use my backup recording device. So I had to sync the audio from my Creative Labs Nomad. Cinelerra is good with audio, but I had to resample to 48000hz to match the audio sampling rate of the original video.

I first tried to match the Nomad audio with the video, but that became an exercise in frustration. I still had the camera audio, so matching the Nomad audio to the cam's audio was MUCH easier than matching up to the video. As well, this method allowed me to play all four audio tracks (2 stereo from Nomad/2 stereo from cam) back at the same time. Monitoring this, if I heard bouncback echo, I knew my synchronization was off. So rule to remember, if you have a couple sources of audio, match to the audio, not what's on the screen, cause you'll be pulling out all your hair trying to match to the vid.

Glad this one is in the bag. It is truly my first complete video created in Cinelerra. Nothing special within, just fades/titles and a little time clock at the end. It was reduced from the original HDV to 320x180, 160kbps sound (247MB). Also, the video quality pretty much sucks because I didn't whitebalance or even focus for that matter. It was inevitable, as I was rushing to get setup for the three measly hours we had in the rehearsal space. Ah well.

Update 2/25/08
Here is a helpful article for anyone needing to troubleshoot audio/video sync problems in Cinelerra:

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