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Audio crackling
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[Michael Gissing] “Sound Devices might be interestedd in this feedback as it may be something they are doing to the audio data when they are passing it through during the on the fly pulldown conversion”
Good suggestion. I’ll try to pass this along to them.
– Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com -
Coming back to this issue. Apple and Sound Devices tech support are both on the case. I’m not 100% sure, but the issue seems (at least IMHO) to be related to the C300/PIX240 combo used on the original production. The C300 only outputs 59.94i over SDI when shooting 23.98. The PIX can remove the added pulldown to end up back with 23.98 files. I’ve done some checking online and there seems to be an issue when you do this over SDI as opposed to HDMI. In any case, my files were recorded using SDI. The picture was fine, but the audio crackled (but only in X). Yesterday, I checked some other files recorded using a C300/PIX240 – but via HDMI – and the audio was clean in X. My suspicion (not confirmed by SD or Apple, yet) is that there’s some incorrect metadata being written when the path is SDI, probably because the stream isn’t correctly detected by the PIX240. This seems to show up as an uncorrectable sample rate mismatch in X, thus the audio artifacts.
– Oliver
Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com
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