[mythtv-commits] Ticket #9812: Setting max rate to 192000 causes DTS-HD HRA track not to play

[MythTV]

#9812: Setting max rate to 192000 causes DTS-HD HRA track not to play
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 Reporter:  mark.goodman@…          |          Owner:  jyavenard
     Type:  Bug Report - General    |         Status:  closed
 Priority:  minor                   |      Milestone:  unknown
Component:  MythTV - Audio Output   |        Version:  Trunk Head
 Severity:  medium                  |     Resolution:  Invalid
 Keywords:                          |  Ticket locked:  0
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Comment (by jyavenard):

 I think you got the bitrate mixed-up in your previous comment.

 Anyhow, the issue is with your amplifier then...

 The digital muxer converts a DTS-HD HighRes stream into a DTS-HD MA stream
 so playing DTS-HD HighRes will appear to the amplifier as if it was DTS-HD
 MA, and this is what it will display, unless HBR Passthrough was disabled
 (in which case the bitrate is forced to 6.144Mbit/s).

 There's no difference between a DTS-HD MA or DTS-HD High-Res track other
 than their bitrates: e.g. a 6.11Mbit/s DTS-HD MA is the same as a DTS-HD
 High-Res and you can't tell them appart.

 A DTS-HD MA could very well be just have a 6.144Mbit/s and you can't
 distinguish those with a DTS-HD High-Res frame.

 For example; some bluray audio starts with a DTS-HD MA at just 6.144Mbit/s
 and later switch to the maximum of 24Mbit/s... (like many Disney cartoons
 where the into is DTS-HD MA 6.144Mbit/s switching later to 24Mbit/s).

 Your patch would break this and would introduce silent for whenever the
 audio stream changed bitrates.

 Alternatively, playing a 24Mbit/s DTS-HD MA, forcing the rate to
 6.144MBit/s will appear as a DTS-HD HighRes to your amp.

 What it means is that your amplifier seems unable to play 6.144Mbit/s DTS-
 HD MA. That would break a lot of playback such as this one:
 http://www.avenard.org/files/media/mediatest/audiotest/Surround/DTS-
 HD%20MA/00048.m2ts
 (this is a DTS-HD MA @ 6.114Mbit.s stream)

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Ticket URL: <http://code.mythtv.org/trac/ticket/9812#comment:3>
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