parsing of AC_4 audio codecs

[Jai Soni]

Hi All,

I am trying to play MP4 file with AC-4 audio track in it. Looks like like Qedemux is not able to undetstand the AC4 audio format.
Looked at the qtdemux file, there is no handling of AC-4 format in it.Digital Silence is observed while playing this file.
So to support this format and play this mp4 file, what is the right approach: extending the qtdemux or writing the ac4 parser & connect it to qtdemux in the pipeline? can someone please clarify.
 
Also is there any spec/documentation available for this?
Thanks for help.

[Baby Octopus]

There is no support for ac-4 at the moment in gstreamer either in demuxer(qtdemux, tsdemux etc). or parser, or the decoder(avdec). One will have to wait till this support is available

[Gabby Park]

Hi Jai,

You can survey what is required to support AC-4 format via Spec document.

(ETSI TS 103 190: Digital Audio Compression (AC-4) Standard)
For about parsing at qtdemux layer, please refer Annex E: AC-4 in the ISO BMFF of upper doc.

Regards.
Gabby