5.1 audio encoded to 2.1?

[jriker1 20]

Looks like it but may be 2.0. I have loads of legacy WMV HD files with 5.1 WMA audio. Looking at my receiver was surprised at what looked like 2.1 audio. Then noticed in Emby it was transcoding it. Ok won’t get into a discussion that the NVidia Shield Pro 2019 is supposed to support this but why is it converted that way?  If the source is 5.1 shouldn’t the transcoding of audio be the same # of channels as the source?  We aren’t even talking 7.1 here. 

Edited April 21, 2021 by jriker1

[Luke 42077]

Hi there, let's look at an example. Please attach the information requested in how to report a media playback issue. thanks !

[jriker1 20]

Sorry for the delay.  Can't be positive, it may be trying to convert it to 5.1 but for some reason the receiver may not like what it's receiving.  I know if I play a standard ac3 movies or DTS MKV it plays in 5.1 surround fine.  Receiver auto selects based on the material and does a good job of it.  When it's playing a a movie that is transcoding because it's WMV/WMA, it comes out in stereo.  Below are the transcoding logs during playback.

ffmpeg-transcode-a4784333-6ad3-4cac-a4cd-08c18677c6e9_1.txt

 

EDIT:  Note I believe looking at the web console for my Denon receiver, it's coming thru as E-AC3 maybe?  Says DD+.  I have a lot of titles that are E-AC3 within MKV containers and they direct play and don't have this issue.

Edited June 14, 2021 by jriker1

[Happy2Play 9780]

Per the log it is maintaining same amount of channels as the wmapro 5.1 is converted to ac3 5.1.

18:21:38.132 Stream mapping:
18:21:38.132   Stream #0:1 -> #0:0 (wmv3 (native) -> h264 (libx264))
18:21:38.132   Stream #0:0 -> #0:1 (wmapro (native) -> ac3 (native))

18:21:38.605     Stream #0:0: Video: h264 (libx264), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 23.98 fps, 90k tbn, 23.98 tbc
18:21:38.605     Metadata:
18:21:38.605       encoder         : Lavc58.62.100 libx264
18:21:38.605     Side data:
18:21:38.605       cpb: bitrate max/min/avg: 5000000/0/0 buffer size: 10000000 vbv_delay: N/A
18:21:38.605     Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1, fltp, 384 kb/s (default)
18:21:38.605     Metadata:
18:21:38.605       encoder         : Lavc58.62.100 ac3

 

[jriker1 20]

Quote

Yes however to what?  It says ac3 but my receiver doesn't feel that's the format.  Says DD+ which would really be E-AC3, not what is listed above, so curious if what's being passed to the receiver isn't clean and it's having a difficult time with it.

 

[Happy2Play 9780]

2 minutes ago, jriker1 said:

  Quote

Yes however to what?  It says ac3 but my receiver doesn't feel that's the format.  Says DD+ which would really be E-AC3, not what is listed above, so curious if what's being passed to the receiver isn't clean and it's having a difficult time with it.

Don't see why but I would think it would that hard to go to the transcode folder a get the media info from the files themselves.  But the log is clear on what is being sent to your reciever.

[rbjtech 5284]

Agreed - the command line used in ffmpeg (from the log) is asking for it to be a 5.1 AC3 (Dolby Digital) file -

-c:a:0 ac3 -ab:a:0 384000 -ar:a:0 48000 -ac:a:0 6 -metadata:s:a:0 language=eng