[RSDK-9807] Return RGBA bytes from viamrtsp #881

Job	Run time
build-and-test (ubuntu-latest, amd64, https://github.com/bluenviron/mediamtx/releases/download/v1...	5m 17s
build-and-test (ubuntu-latest, amd64, https://github.com/bluenviron/mediamtx/releases/download/v1...	5m 23s
build-and-test (ubuntu-latest, amd64, https://github.com/bluenviron/mediamtx/releases/download/v1...	8m 1s
build-and-test (ubuntu-latest, amd64, https://github.com/bluenviron/mediamtx/releases/download/v1...	8m 3s
build-and-test (buildjet-8vcpu-ubuntu-2204-arm, arm64, https://github.com/bluenviron/mediamtx/rel...	21m 16s
build-and-test (buildjet-8vcpu-ubuntu-2204-arm, arm64, https://github.com/bluenviron/mediamtx/rel...	5m 22s
build-and-test (buildjet-8vcpu-ubuntu-2204-arm, arm64, https://github.com/bluenviron/mediamtx/rel...	5m 9s
build-and-test (buildjet-8vcpu-ubuntu-2204-arm, arm64, https://github.com/bluenviron/mediamtx/rel...	5m 9s
	1h 3m 40s

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