I don't have a pi handy, but the pipeline will look something like:

gst-launch-1.0 -e \
               videotestsrc pattern=3D0 ! x264enc ! h264parse ! queue ! =
mux. \
               videotestsrc pattern=3D1 ! x264enc ! h264parse ! queue ! =
mux. \
               videotestsrc pattern=3D2 ! x264enc ! h264parse ! queue ! =
mux. \
               videotestsrc pattern=3D3 ! x264enc ! h264parse ! queue ! =
mux. \
               videotestsrc pattern=3D4 ! x264enc ! h264parse ! queue ! =
mux. \
               audiotestsrc wave=3D0 ! avenc_aac ! aacparse ! queue ! =
mux. \
               audiotestsrc wave=3D1 ! avenc_aac ! aacparse ! queue ! =
mux. \
               audiotestsrc wave=3D2 ! avenc_aac ! aacparse ! queue ! =
mux. \
               audiotestsrc wave=3D3 ! avenc_aac ! aacparse ! queue ! =
mux. \
               audiotestsrc wave=3D4 ! avenc_aac ! aacparse ! queue ! =
mux. \
               audiotestsrc wave=3D5 ! avenc_aac ! aacparse ! queue ! =
mux. \
               mp4mux name=3Dmux ! filesink location=3Dmultichannel.mp4

Remember to replace the codecs by HW accelerated ones in the board. You =
may also need some videoconverts/audioconverts between the source and =
the codecs.

If then you run gst-discoverer-1.0 or ffprobe, you'll see all the =
streams:

gst-discoverer-1.0 multichannel.mp4
Analyzing file://.../multichannel.mp4
Done discovering file://.../multichannel.mp4

Properties:
  Duration: 0:01:00.666666666
  Seekable: yes
  Live: no
  container #0: Quicktime
    video #1: H.264 (High 4:4:4 Profile)
      Stream ID: =
5d5147a411fca6ac5b9d25e15cb88b581ab3dad0e4fab3dc143cd0501c3f984f/001
      Width: 320
      Height: 240
      Depth: 24
      Frame rate: 30/1
      Pixel aspect ratio: 1/1
      Interlaced: false
      Bitrate: 1488272
      Max bitrate: 2097152
    video #2: H.264 (High 4:4:4 Profile)
      Stream ID: =
5d5147a411fca6ac5b9d25e15cb88b581ab3dad0e4fab3dc143cd0501c3f984f/002
      Width: 320
      Height: 240
      Depth: 24
      Frame rate: 30/1
      Pixel aspect ratio: 1/1
      Interlaced: false
      Bitrate: 2055385
      Max bitrate: 2097152
....
    audio #10: MPEG-4 AAC
      Stream ID: =
5d5147a411fca6ac5b9d25e15cb88b581ab3dad0e4fab3dc143cd0501c3f984f/010
      Language: <unknown>
      Channels: 1 (unknown layout)
      Sample rate: 44100
      Depth: 32
      Bitrate: 1423
      Max bitrate: 7235
    audio #11: MPEG-4 AAC
      Stream ID: =
5d5147a411fca6ac5b9d25e15cb88b581ab3dad0e4fab3dc143cd0501c3f984f/011
      Language: <unknown>
      Channels: 1 (unknown layout)
      Sample rate: 44100
      Depth: 32
      Bitrate: 69165
      Max bitrate: 80275

> On 9 Apr 2024, at 11:32, Carl Karsten via gstreamer-devel =
<gstreamer-devel@lists.freedesktop.org> wrote:
>=20
> I would like to record 5 video streams and 6 audio streams to 1 file.
>=20
> this will all run on a pi4 (or maybe 5)
> 2 pi cameras libcamerasrc ... v4l2h264enc  (can the gpu encode 2 =
streams?)
> 1 usb cam
> 2 tcpserversrc    (coming from another pi gst.... tcpclientsink)
>=20
> audio is 4 usb audio devices
>=20
> I suspect the 2 tcp sources should use GstNet.NetClientClock
>=20
> I think the only thing I need help with is muxing all the streams into
> one so if someone can give me a gst-launch with 5+6 testsrc's I'll
> take a shot at swapping them for the real sources.
>=20
>=20
> --=20
> Carl K