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Old 01-02-2020, 01:54 PM   #1
createmedia
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Default Multitrack audio order + how to make a 7.1 audio export?

Hello perhaps someone can help me not to be confused.

I have as my Editing AV amplifier a Yamaha RX-A870 which has 9 speaker outlets.

I have set up as 7.1 speakers on Edius.

According to the set up graphic on the Yamaha all the speakers are identified by the test tone as being in the correct sockets.

But....

I am noticing that online material that is 5.1 is using the side speakers as the rear pair.

Also I downloaded the Dolby 7.1 dolby_truehd_channel_check_lossless-DWEU and placed it on the timeline. That contains speaker identifier audio.

I also have the speaker identifier "wave extensive test 8_Channel_ID" from Microsoft on the timeline.

Both files are in the same track order which is L, R, C, LFE, Rear Effect, Side Effect, which is contrary to the Yamaha speaker set up graphic and test tone.

I can see the logic of putting the rear surround effect on tracks 5 and 6 as if the user has only 5.1 then the 7.1 source will simply have tracks 7 and 8 thrown away i.e. the side speaker audio which the user can't hear., and it makes 7.1 compatible with 5.1 as an extended speaker set.

However it seems to be much reported on the web that the track order is as the room is laid out L, R, C, LFE, Side, Rear. This appears in practice to be wrong but agrees with the Yamaha set up screen.

I am left with only the choice to swap the speaker cables over and ignore the Yamaha speaker set up test tone graphic as wrong information (the tone correctly comes out of the highlighted speaker at present).

I can't find a way of making a video that the TV will understand with 7.1 audio tracks on as most converters/exporters are limited to 5.1. Does anyone know of anything?

Research says that DTS supports 7.1 as does True HD but I haven't found anything to make such a file from an intermediary export from Edius.

Lastly, I have a Samsung BDF7500 Blu-ray attached to the Yamaha, but if I make an MP4 with AAC (5.1) audio in Edius exporter, and try to play a USB stick the Blu-Ray player says the audio codec is not supported, yet it is in the player spec that AAC is supported.

What is the difference between multi channels and multi tracks in the exporter extended settings for AAC audio?

Regards

Mike

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Old 01-02-2020, 05:54 PM   #2
BernH
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Quote:
Originally Posted by createmedia View Post
What is the difference between multi channels and multi tracks in the exporter extended settings for AAC audio?
I can't speak to the other questions you have, as I am not working in 5.1 or 7.1 with Edius, nor do I have a Yamaha amp like you.

I can hopefully clarify the audio tracks vs channels question though in terms of the general terminology and how it applies to media files. If you are already familiar with these concepts, I apologize in advance, but perhaps others may get some insight.

You can think of tracks the same as the audio layers/tracks on your timeline, and channels the same as the content of the layers/tracks. In that regard, a timeline audio layer/track can be mono, stereo, or with some NLE's 5.1, but regardless of the number of channels of audio you place on the layer/track, it is still one track.

Likewise an output file can have each audio channel in a separate track or a single stereo track, a 5.1 track, etc., or even one of each type.

Often consumer products prefer the single track with multiple channels in the track, and have problems dealing with discrete tracks, but professional products such as a broadcast playout server often require a discrete 1 channel per track (ie. an mxf op1a broadcast file for a playout server has 8 tracks with the audio laid out 1 channel per track in SMPTE order, and even if there are not enough audio channels to fill the 8 tracks, the tracks are still there with no content)
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Old 01-02-2020, 11:59 PM   #3
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have you setup the stairstep in the sequence channel map? also, project setting needs to be on 8 channel for 7.1 and 6 channel for 5.1
https://www.videoproductions.com.au/...1-surround.mp4
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Old 01-03-2020, 02:45 AM   #4
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Yes Anton

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Old 01-06-2020, 01:25 PM   #5
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Ive not checked 9.5 but there is an issue with Edius 7.5 and all other platforms I use for 5.1.

The protocol in Audition, Ppro and Vegas is not followed in Edius - as far as I recall channels 3 and 4 are always reversed - channel 3 is centre and 4 is LFE but even if you set this on your mapping, after export the mapping between 3 and 4 is switched.

Maybe it's been fixed in 9.5 - don't have time to check this now.

Paul :-)
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