Possible problem with rtpbin when using AAC?

[Peter Maersk-Moller]

Hi Sebastian.

Right, the pasted script had a port mismatch although what I tested had the
right ports.
Anyway, I have narrowed it down to this, headline: Streaming AAC using RTP
does not work and it seems not related to using rtpbin or at least not that
alone. My question to you is then which module should I file the bug under?

I have 3 sender scenarios:

$ AUDIO='audio/x-raw,rate=48000,channels=2'
$ gst-launch-1.0 -v audiotestsrc is-live=1 ! $AUDIO ! faac ! queue !
rtpmp4apay ! udpsink host=127.0.0.1 port=14002
$ gst-launch-1.0 -v audiotestsrc is-live=1 ! $AUDIO ! avenc_aac  ! queue !
rtpmp4apay ! udpsink host=127.0.0.1 port=14002
$ gst-launch-1.0 -v audiotestsrc is-live=1 ! $AUDIO ! avenc_aac
compliance=-2 ! queue ! rtpmp4apay ! udpsink host=127.0.0.1 port=14002

On the receiving end, you can narrow it down to this:

gst-launch-1.0 -v udpsrc port=14002
caps="application/x-rtp,media=audio,payload=96,clock-rate=48000,encoding-name=MP4A-LATM"
do-timestamp=1 ! rtpmp4adepay ! aacparse ! identity silent=0 ! autoaudiosink

Then you will see no data coming out from *aacparse*. You can replace
*aacparse* with *avdec*_aac or *decodebin*, *decodebin* probably uses
*avdec*_aac. Using identity before *aacparse* or *avdec_aac* reveals DTS
and PTS starting nicely from 0.

So my question is which module should I file it under? Could be something
with rtpmp4apay/depay ?


Regards
Peter

On Wed, May 11, 2016 at 8:43 AM, Sebastian Dröge <sebastian at centricular.com>
wrote:

> On Di, 2016-05-10 at 13:12 +0200, Peter Maersk-Moller wrote:
> > Hi Sebastian.
> >
> > Video works fine alone (also works when MP3 audio is included).
> > Audio alone works for MP3. Audio never gets to play when using AAC.
> > So it does not work for AAC.
> >
> > Audio alone scripts are included for you to verify. With rtpbin, they
> > can now hardly be stripped further.
>
> Your scripts are using different ports as base: 14000 and 14100
>
> After fixing this, the problem becomes that aacparse can't do anything
> with the output of the depayloader for whatever reason. It consumes
> buffers but never outputs anything.
>
> Can you file a bug with simplified and fixed up scripts? E.g. you don't
> need the audioparse, or the various capsfilters on the sender.
>
> --
> Sebastian Dröge, Centricular Ltd · http://www.centricular.com
>
>
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