Need some help understanding a video conversion issue I am seeing. I'm taking a captured AVI file (
HuffYUV encoded, 640x480, 29.970 FR, audio is PCM 48kHz) from PC to Mac, then using Apple Compressor to convert to an editable format for FCP. I choose Apple's ProRes422 HQ, and I see a difference in the encoded output when I use the setting "Frame Rate = 29.97" versus using "Frame Rate = Same As Source". When I use 29.97, I have noticed that some duplicate frames are added to the video (perhaps substituted, not sure yet). This creates some slight jittery spots in some places. In this case, the audio is in sync with the output video.
When encoded with "Same as Source" frame rate choice, I don't see the duplicate frames anymore, but I also notice in that case that the output has about 49 frames less (out of 200K or so) than the original AVI. Also, the output audio is out of sync with the output video in that case, even when I set Compressor to do "pass through" audio (...and I get the same result when audio is set to PCM in compressor).
I am wondering if Compressor is seeing bad frames and dropping them (and substituting a duplicate when I use the 29.97 frame rate setting to maintain the rate?). Is there any way to tell which case it is? Also, what's a good way to make sure the audio is in sync with the video, if I choose to stick with the video output that doesn't add duplicates?
Maybe I should be figuring out if it's bad frames (and fixing?) first? I am not aware of any tools that do that yet.