AW: AW: AW: AW: Question about decodebin and prerolling

[Bernhard Graaf]

Mp4mux is supporting these audio formats (gst-inspect-1.0 mp4mux):
  SINK template: 'audio_%u'
    Availability: On request
    Capabilities:
      audio/mpeg
            mpegversion: 1
                  layer: [ 1, 3 ]
               channels: [ 1, 2 ]
                   rate: [ 1, 2147483647 ]
      audio/mpeg
            mpegversion: 4
          stream-format: raw
               channels: [ 1, 8 ]
                   rate: [ 1, 2147483647 ]
      audio/x-ac3
               channels: [ 1, 6 ]
                   rate: [ 1, 2147483647 ]
      audio/x-alac
               channels: [ 1, 2 ]
                   rate: [ 1, 2147483647 ]
      audio/x-opus
        channel-mapping-family: [ 0, 255 ]
               channels: [ 1, 8 ]
                   rate: [ 1, 2147483647 ]

Therefore you should use avenc_ac3

-----Ursprüngliche Nachricht-----
Von: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org]
Im Auftrag von Russel Winder
Gesendet: Donnerstag, 20. Dezember 2018 20:07
An: Discussion of the development of and with GStreamer
Betreff: Re: AW: AW: AW: Question about decodebin and prerolling

On Thu, 2018-12-20 at 18:41 +0100, Bernhard Graaf wrote:
> Audioencoder is only a synonymous for what encoder you want to use (mpgeg,
> ac3, and so on).
> 

I had been hoping it was a smart element working according to the format of
input, otherwise you have to know ahead of time what formats are in use.

As it happens the test file has a52 format, and the MPEG-4 file should have
AAC (I believe, this is not a fact!) Whilst there is an a52dec element, the
faac element is not in the bad plugin as reported at   
https://gstreamer.freedesktop.org/documentation/plugins.html

-- 
Russel.
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