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Audio sample rate change on import – what do I do?
Hi all,
Just capturing some DVCam footage into MC but unfortunately MC is telling me that some of the sound on certain tapes is at sample rate 32000 instead of 48000. When it finishes the capture it tells me about the sound resolution conflict and asks if I want to change the audio settings for the project to allow the 32000 footage to be captured. I obviously don’t want to do this and therefore am trying to find the easiest way of getting this footage captured. At the moment the only option that works for me is to create a completely new project with the project audio set at 32000 – it then allows the footage to be captured. From here I can change the sample rate of the audio on the clip and then import the clip into the original project. This seems unreasonably complicated. So my questions are:(1) Is there any way of capturing footage at a different sample rate to the project? [if so, this takes a step out of the process. I know you can IMPORT footage with a different sample rate, but haven’t worked out if this is possible with capture yet]
(2) Is there any way of automatically getting AVID to change the sample rate of captured material? [again I know this is possible for IMPORTED material, but don’t know about captured footage].
Any thoughts on this would be really handy, I’m a bit stuck and with a shelf full of tapes to edit I need the easiest workflow round this problem as possible,
Many thanks,
Paul -
5 Replies
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Capture Tape01, which we’ll say has a sample rate of 48kHz.
Pop in Tape02, which we’ll say has a sample rate of 32kHz, and Avid asks if you want to change the Audio project settings. Select Yes. Capture Tape02 at 32kHz.
Continue until all footage is in the system. When it is, change your Audio Project back to the sample rate you want (say 48kHz), then select all your clips with a 32kHz sample rate. With all those clips selected, go to Clip–>Change Sample Rate. Choose Sample Rate: 48kHz, Quality: High, and check the Delete Original Media box. Choose a drive and hit OK. It will change all the 32kHz files to 48kHz, delete the original 32kHz audio, and associate the new 48kHz files with the video.
If you don’t choose to delete the original media you’ll have video with 32kHz audio still, but Avid will make new audio tracks at 48kHz. This means you have to match the 48kHz audio to the video and sync them up. Choose to delete the original media and you avoid that mess.
Michael.
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Brilliant, thanks once again Michael,
Cheers,
Paul -
Hi again,
If I capture the audio at 32kHz and upgrade it to 48kHz in the offline, will this process be repeated in the online (resulting in a reduction of quality) or will it capture it directly as 48kHz from the original tapes?
Would it be better to wait and get the tapes transferred again allowing the audio to be captured at 48kHz directly from the tape?
Many thanks,
Paul -
If the audio is recorded at 32kHz, you won’t be able to capture it at 48kHz unless you have a way to dub it to another tape, converting the audio in the process. Avid reads the sample rate off the tape, so if this is offline/online, it will change your Audio Project sample rate to match the audio it’s capturing for each tape.
Either way, it won’t matter quality wise. Once it’s recorded at 32kHz, converting it to 48 won’t improve the quality. It’s like capturing at DV25 footage at 1:1–the file quality is still DV25, you’re just wrapping it in a much, much larger file.
If this is offline/online, though, there’s really no reason to convert the sample rates. Just go to your Audio Project and make sure you have it set up to convert sample rates on the fly. Computers are fast enough now to handle the conversion in realtime. If you’re going to cut back to DV tape, though, you’ll need to convert them so all audio matches.
Michael.
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Thanks Michael,
Paul
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