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Audio issues with Apple ProRes 422 (HQ) 8 ch -> MXF OP1a with Adobe Media Encoder

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Andrew Varshavsky
Audio issues with Apple ProRes 422 (HQ) 8 ch -> MXF OP1a with Adobe Media Encoder
on May 24, 2011 at 11:08:10 pm

Hi, everyone,

The problem has been driving me nuts for the past few days. I hope someone has encountered the similar situation and would point me to a solution.

I am trying to compress the ProRes 422 HQ file (8 channel) to MXF OP1a (2 channel stereo) with Adobe Media Encoder. I was successful with getting a variety of other outputs, but all of them have screwed up audio. I am not sure exactly what ends up in the output file, but I suspect that it's just last matrix stereo channel and not the sound isn't properly downmixed into stereo.

Quicktime plays the ProRes file perfectly. Adobe Media Encoder shows the source information in its summary as "Clip, name.mov, 1920x1080 (1.0), 23.976 fps, Progressive, ..., 48000 Hz, Mono. Note the Mono part. I tried opening the source file with Premiere and I hear the same screwed up sound, but I can see 8 tracks in the timeline.

Anyway, all I want is a good ol' MPEG with 2 channels out of this :) Please help.

Now required technical info:

- Windows 7 64-bit Ultimate
- Adobe Media Encoder CS 5.5

- Source: Apple ProRes 422 (HQ), 8 channel audio
Details from QuickTime Inspector:

Format: Apple ProRes 422 (HQ)
16­bit Integer (Little Endian), Left, 48.000kHz
16­bit Integer (Little Endian), Right, 48.000 kHz
16­bit Integer (Little Endian), Center,  48.000 kHz
16­bit Integer (Little Endian), LFE Screen, 48.000 kHz
16­bit Integer (Little Endian), Left Surround, 48.000 kHz
16­bit Integer (Little Endian), Right Surround, 48.000 kHz
16­bit Integer (Little Endian), Matrix Stereo (Lt Rt), 48.000 kHz
Movie FPS: 23.98
Data Rate: 175.41 mbits/sec
Normal Size: 1920 x 1080 pixels
Current Size: 1920 x 1080 pixels

Type: QuickTime Movie
File Size: 175.4 GB
Image Size: 1920 x 1080
Frame Rate: 23.976
Source Audio Format: 48000 Hz - 16 bit - Mono
Project Audio Format: 48000 Hz - 32 bit floating point - Mono
Total Duration: 02:23:01:00
Average Data Rate: 20.9 MB / second
Pixel Aspect Ratio: 1.0

QuickTime Details:
Movie contains 1 video track(s), 7 audio track(s) and 1 timecode track(s).

Video:
There are 205944 frames with a duration of 25/599ths.

Video track 1:
Duration is 2:23:09:14
Average frame rate is 23.98 fps

Video track 1 contains 2 type(s) of video data:

Video data block #1:
Frame Size = 1920 x 1080
Compressor = Apple ProRes 422 (HQ)
Quality = Most (5.00)

Video data block #2:
Frame Size = 1920 x 1080
Compressor = Apple ProRes 422 (HQ)
Quality = Most (5.00)

Audio:
Audio track 1 contains 1 type(s) of audio data:

Audio data block #1:
Format = 16 bit - Mono
Rate = 48000 Hz
Compressor = 16-bit Little Endian


Audio track 2 contains 1 type(s) of audio data:

Audio data block #1:
Format = 16 bit - Mono
Rate = 48000 Hz
Compressor = 16-bit Little Endian


.... and so on....

Timecode:
Timecode track 1 contains 1 type(s) of data:

Timecode data block #1:
Start Time = 01:00:00:00
Reel name =


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Craig Seeman
Re: Audio issues with Apple ProRes 422 (HQ) 8 ch -> MXF OP1a with Adobe Media Encoder
on May 25, 2011 at 12:22:12 am

Try Telestream Episode Pro and use the Channel Mapper or Channels filter for the audio.



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Andrew Varshavsky
Re: Audio issues with Apple ProRes 422 (HQ) 8 ch -> MXF OP1a with Adobe Media Encoder
on May 25, 2011 at 7:06:41 pm

Thanks, but the trial version doesn't allow me to test if what you suggest works. Plus their trial version gives me initialization failed for every encode that I try to make, even on other files...

While I am trying to get a hold of their tech support, do you know of any other way?


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