MPEG-4 Audio & Generic payloaders depayloaders

MPEG-4 Audio

Pipelines

gst-launch-1.0 audiotestsrc is-live=true ! fdkaacenc ! rtpmp4apay2 ! udpsink host=127.0.0.1 port=5004

gst-launch-1.0 udpsrc caps='application/x-rtp,media=audio,clock-rate=90000,encoding-name=MP4A-LATM,payload=96,config=(string)40002410' ! rtpjitterbuffer ! rtpmp4adepay2 ! decodebin3 ! audioconvert ! audioresample ! autoaudiosink

MPEG-4 Generic

Notable changes for the payloader:

• Uses a larger mode Config's sizelength than rtpmp4gpay for video otherwise some large AU can't be payloaded. rtpmp4gpay uses bit shifts to have the AU data size fit in 13 bits, resulting in an invalid size.
• Implements an aggregate-mode property which allows selecting between:
  • Zero Latency: always send out elementary streams right away, do not wait for more elementary streams to fill a packet.
  • Aggregate: collect elementary streams until we have a full packet or the max-ptime limit is hit (if set).
  • Automatic (default): zero-latency if upstream is live, otherwise aggregate elementary streams until packet is full.
• Not advertising unsupported CELP modes.

Pipelines

Audio

gst-launch-1.0 audiotestsrc is-live=true ! fdkaacenc ! rtpmp4gpay2 ! udpsink host=127.0.0.1 port=5004

gst-launch-1.0 udpsrc caps='application/x-rtp,media=audio,clock-rate=44100,encoding-name=MPEG4-GENERIC,payload=96,encoding-params=1,streamtype=5,profile-level-id=2,mode=AAC-hbr,config=(string)1208,sizelength=13,indexlength=3,indexdeltalength=3' ! rtpjitterbuffer ! rtpmp4gdepay2 ! decodebin3 ! audioconvert ! audioresample ! autoaudiosink

Video

gst-launch-1.0 videotestsrc is-live=true ! avenc_mpeg4 ! mpeg4videoparse ! rtpmp4gpay2 ! udpsink host=127.0.0.1 port=5004

gst-launch-1.0 udpsrc caps='application/x-rtp,media=video,clock-rate=90000,encoding-name=MPEG4-GENERIC,payload=96,mode=generic,sizelength=16,indexlength=3,indexdeltalength=3' ! rtpjitterbuffer ! rtpmp4gdepay2 ! decodebin3 ! videoconvert ! autovideosink