donut/FAQ.md

FAQ

I can't connect two tabs or browser at the same for the SRT

It doesn't work When I try to connect in another browser or tab, or even when I try to refresh the current page. It raises an seemingly timeout error.

astisrt: connecting failed: astisrt: connecting failed: astisrt: Connection setup failure: connection timed out

Apparently both ffmpeg and srt-live-transmit won't allow multiple persistent connections.

ref1 https://github.com/Haivision/srt/blob/master/docs/apps/srt-live-transmit.md#medium-srt ref2 https://github.com/asticode/go-astisrt/issues/6#issuecomment-1917076767

It's not working on Firefox/Chrome/Edge.

WebRTC establishes a baseline set of codecs which all compliant browsers are required to support. Some browsers may choose to allow other codecs as well.

You might also want to check the general support for codecs by containers.

If you're facing issues while trying to run or compile it locally, such as:

mod/github.com/asticode/go-astisrt@v0.3.0/pkg/callbacks.go:4:11: fatal error: 'srt/srt.h' file not found
 #include <srt/srt.h>
          ^~~~~~~~~~~
1 error generated.

./main.go:117:2: undefined: setCors
./main.go:135:3: undefined: errorToHTTP
./main.go:147:3: undefined: errorToHTTP
./main.go:154:3: undefined: errorToHTTP
./main.go:158:3: undefined: errorToHTTP
./main.go:165:3: undefined: errorToHTTP
./main.go:174:18: undefined: assertSignalingCorrect

/opt/homebrew/Cellar/go/1.21.6/libexec/pkg/tool/darwin_arm64/link: running cc failed: exit status 1
ld: warning: ignoring duplicate libraries: '-lsrt'
ld: library 'srt' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)

You can try to use the docker-compose, but if you want to run it locally you must provide path to the linker.

#  For MacOS
CGO_LDFLAGS="-L$(brew --prefix srt)/lib -lsrt" CGO_CFLAGS="-I$(brew --prefix srt)/include/" go run main.go

If you're seeing the error "could not determine kind of name for C.AV_CODEC"

Make sure you're using ffmpeg "n5.1.2" (via make install-ffmpeg), go-astiav@v0.12.0 only supports ffmpeg 5.0.

../../go/pkg/mod/github.com/asticode/go-astiav@v0.12.0/codec_context_flag.go:38:50: could not determine kind of name for C.AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
../../go/pkg/mod/github.com/asticode/go-astiav@v0.12.0/codec_context_flag.go:21:51: could not determine kind of name for C.AV_CODEC_FLAG_TRUNCATED

If you're seeing the error "issue /usr/bin/ld: skipping incompatible lib.so when searching for -lavdevice"

Fixing the docker platform fixed the problem. Even though the configured platform is amd64, the final objects are x64, don't know why yet.

# The tools to check the compiled objects format:
find / -name libsrt.so # to find the objects
objdump -a /opt/srt_lib/lib/libsrt.so
objdump -a /usr/local/lib/libavformat.so

Fixing the platform.

Dockerfile

FROM --platform=linux/amd64 jrottenberg/ffmpeg:5.1.2-ubuntu2004  AS base

docker-compose.yml

platform: "linux/amd64"