Adding 7.1 multichannel audio record and stream - Githubissues

pkviet / obs-studio

OBS - Free and open source software for live streaming and screen recording

https://obsproject.com/mantis/

GNU General Public License v2.0

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Adding 7.1 multichannel audio record and stream #1

Closed pkviet closed 7 years ago

pkviet commented 7 years ago

This is a very hasty proof-of-concept attempt to enable multichannel audio support for both recording and streaming with OBS 19.0.2.

Downmixing of decklink is bypassed
- 7.1 channel selection is enabled in UI (settings > audio )
- max audio channels increased from 2 to 8 in audio-io.h
- flv-mux enabled with 7.1 audio (beware, rtmp supports multichannel but flv files do not)

This basically works :

recording of 7.1 works fine in either standard or advanced recording mode with ts or mkv file
streaming of mpeg-ts and rtmp with multichannel audio both work ==> this was checked by recording with ffmpeg the rtmp and mpeg-ts streams as mp4 and ts files respectively. (NB: mpeg-ts tcp stream works perfectly, but mpeg-ts udp has audio sync issues)

To do:

improve code with a downmixing switch; downmixing should be a default option
add other multichannel setups in the audio UI: 3.0 3.1 4.0 4.1 5.1 6.1 7.0 8.0 16.0 (8.0 and 16.0 have to be supported by the audio encoder ==> pcm is ok in mkv ; for aac 7.1 is probably max)

pkviet commented 7 years ago

updated code in branch multichannelaudio: 2.1, 4.0, 5.1 and 7.1 support.