No sound for AAC TV channel (HD) (1 Viewer)

[cnicolas]

I use LAV installed with MP 1.9, version 0.63, on Windows Seven.
The problem is only with sound, video is ok with LAV...

 

[mm1352000]

Also, @Vasilich were you using TsReader as splitter? According to Owlsroost's comment there's a bug in TsReader which is probably responsible. No problem with LAV... but TsReader + LAV won't play audio.

 

[Owlsroost]

Also, @Vasilich were you using TsReader as splitter? According to Owlsroost's comment there's a bug in TsReader which is probably responsible. No problem with LAV... but TsReader + LAV won't play audio.

Correct - TsReader can't handle this particular form of AAC stream packaging (ADTS) - it's actually a missing feature, rather than a bug

 

[Vasilich]

but how then can it work with divx decoder?

 

[Owlsroost]

The basic problem is that the audio parser in TsReader.ax assumes that the audio data frames are aligned to PES packet boundaries. These particular streams use ADTS packaging (not LATM) for AAC, and the frames are not always aligned to PES packets. This means that the 'samples' that TsReader feeds to the audio decode filter are not complete frames (i.e. one frame per sample). The DivX decoder can handle this, but LAV decoder can't.

The solution is to add a parser to TsReader which can handle AAC ADTS packaging correctly. It's on my ToDo but it's one of those 'need to get my head around it' problems in terms of writing a parser......

 

[Owlsroost]

I've made good progress with modifying TsReader so that LAV Audio decoder can be used for ADTS AAC streams - expect a test version of TsReader sometime this week....

 

[mm1352000]

I've made good progress with modifying TsReader so that LAV Audio decoder can be used for ADTS AAC streams - expect a test version of TsReader sometime this week....

You're a star!

 

[Owlsroost]

Test version of TsReader.ax is here - https://forum.team-mediaportal.com/...ench-provider-free.118930/page-2#post-1115189