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5.1 Surround Encoding MXF for Broadcast
Hello, all. Please point me in the right direction on this.
I’ve edited a project in Avid contain 5.1+2 sound (this needs to be L, R, C, LFE, Ls, Rs, L Stereo Mix, R Stereo Mix for broadcast). I’ve got all the channels mapped properly in an Avid Sequence, and the audio meters bear that out.
I need to send a QuickTime reference file to Adobe Premiere Pro (for encoding to MXF file format with 608 AND 708 captions). However, Premiere – as well as MediaInfo – are only seeing the audio as having all 8 channels listed above mixed down to Stereo 2.0. Therefore, no matter how many channels I tell the encoder to output (should be 8), it’s only encoding a mixed down version of the 8 channels into 2 channels.
MediaInfo sees all 8 STREAMS of audio, but it’s only seeing 2 CHANNELS in the final encoded file. What am I missing here?
I’ve even taken the individual audio tracks mixed from Pro Tools into Premiere, placed them on the correct channels, and tried a test encode from there. Still, I only get a 2.0 mixed down version of the audio.
How can I deliver an encoded MXF file for broadcast using the channel map I listed above? Nothing I try works. Please help.
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7 Replies
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I would suggest exporting a Same As Source with audio settings set to “direc out” in the export menu. When I do that, I see 8 tracks in the resulting QT file.
Michael
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I just tried a test file using your method. I’ll attach screen shots of both my audio output settings and what MediaInfo is telling me about the file that was exported. It’s only seeing 2 channels of audio for some reason… I have 8 tracks of audio in my timeline, mapped like I described in my original post.
I don’t know why it’s not outputting correctly.
Audio output settings in Avid:
MediaInfo analysis:
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You need to set direct out in the quicktime settings.
Mark Renz
Senior Editor
Outpost Worldwide -
And when you do, the file will look like this in MediaInfo and QT Player:
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Thanks for the responses. I find it odd that MediaInfo only lists 2 audio streams in the “Audio” section when there are actually 8. It’s good to know that wasn’t the reason I was messing this up.
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You’ll notice in the top section of my MediaInfo screenshot that it lists 8 channels with PCM/PCM/PCM/etc…
Michael
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My previous attempts, in which all 8 channels were down-mixed into 2, also listed those 8 channels. That’s what was throwing me off. Either way, we got it figured out!
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