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MXF audio issue
Hi!
I’ve just properly started using Resolve for editing (although been using it for grading) after finally jumping ship from Premiere. All is good except I’ve got a curious issue with some audio.
If I’m playing back an MXF clip shot on a Sony camera (FS7 and FX9 in the two projects I have in front of me) then the audio is silent for about a second or so. It does this from the start of a clip or a cut point. However, that is only in the Edit page (and intermittently in the Color page too) – if I click over to Fairlight then it plays back fine.
It doesn’t do this on WAV files which have been recorded on an external recorder.
It doesn’t do it on the audio coming in from an A7S.I’ve also exported a clip from Resolve as fresh files and reimported (both ProRes and MXF at the same bitrate as the camera file). And the audio on those files are fine too.
So, I’m a bit stumped. Anyone else had anything like this? And is there anything I’m missing to try to resolve the issue? (In Premiere, flushing my cache would often do the trick for any problems, there might be something similar I’m not aware of in Resolve!)
Oh, and this is on OSX with a six month old Mac Pro which is full of power and RAM!
Thanks!
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4 Replies
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Personally I have not experienced any issues with mxf files from a range of cameras in Resolve including the FS7ii so I’m not sure what might be going on. I’m monitoring audio via the Fairlight CC2 card or prior to that the Decklink 4k card. How are you monitoring audio?
Also what is the sample rate and bit depth of the problem files? Number of tracks etc. Sony cameras are annoying in that they record so many audio tracks, even when they are silent. Just for interest try going to clip attributes on one of these problem files and turn off all but tracks with audio to see if it is related to having all those useless tracks trying to play.
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Hi Michael
Thanks for the reply!
At present, the audio is being monitored just via the Mac audio. I don’t think that is the issue, though as all other audio is playing out fine. The MXf files sometimes seem to play back fine if they have already been played, but if I then play another part of the timeline then they are silent again when I go back to them – which seems like a cache issue, maybe?
It’s 10-bit 48khz Linear PCM, and recording the full 8 tracks as per usual with Sony.
Tried muting the other six audio tracks that are mute and that hasn’t fixd it.
Another of our editors is also experiencing the same issue – he’s running Resolve on an iMac. Once again, audio from any other files is not a problem, it’s just the MXF files. -
10bit ? Audio bit depths are usually 16, 24 (standard) or 32.
I suggest looking at the Blackmagic forums and search for your problem. Others may have experienced this and reported it but if not, that is the way to send feedback, especially if you are using the free version. It helps to have Resolve version number and free or studio info in any bug report.
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D’oh! Yes – 24 bit, of course!
OK – I’ll have a search on Blackmagic forums. THanks!
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