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donut/FAQ.md
Leandro Moreira c43f779fba fix build with race and add faq
2024-02-18 15:35:14 -03:00

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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"

If you're seeing the error "checkptr: converted pointer straddles multiple allocations" when using -race

When the app runs using go build -race it stops with the error "converted pointer straddles multiple allocations". I tried to upgrade the golang image but it didn't work, so I remove the -race from building.

srt-1     |  connected.
srt-1     | Accepted SRT target connection
app-1     | fatal error: checkptr: converted pointer straddles multiple allocations
app-1     |
app-1     | goroutine 68 [running]:
app-1     | runtime.throw({0xe57eb2?, 0xc00003f17c?})
app-1     | 	/usr/local/go/src/runtime/panic.go:1047 +0x5d fp=0xc0001d7700 sp=0xc0001d76d0 pc=0x44febd
app-1     | runtime.checkptrAlignment(0xc00031840d?, 0x3?, 0x7ffffa869c74?)
app-1     | 	/usr/local/go/src/runtime/checkptr.go:26 +0x6c fp=0xc0001d7720 sp=0xc0001d7700 pc=0x41eacc
app-1     | github.com/asticode/go-astisrt/pkg.(*Socket).Connect(0xc00003e150, {0xc00031840d, 0x3}, 0xc0b0?)
app-1     | 	/go/pkg/mod/github.com/asticode/go-astisrt@v0.3.0/pkg/socket.go:85 +0x245 fp=0xc0001d77a0 sp=0xc0001d7720 pc=0xc58ce5
app-1     | github.com/asticode/go-astisrt/pkg.Dial({{0xc000232ba0, 0x4, 0x4}, {0xc00031840d, 0x3}, 0xc0001c4060, 0x9c74})
app-1     | 	/go/pkg/mod/github.com/asticode/go-astisrt@v0.3.0/pkg/client.go:53 +0x445 fp=0xc0001d78d8 sp=0xc0001d77a0 pc=0xc55925
app-1     | github.com/flavioribeiro/donut/internal/controllers/streamers.(*SRTMpegTSStreamer).connect(0xc0002aae40, 0xc0000f4550, 0xc00010c050)
app-1     | 	/usr/src/app/donut/internal/controllers/streamers/srt_mpegts.go:161 +0x819 fp=0xc0001d7b00 sp=0xc0001d78d8 pc=0xc61bf9
app-1     | github.com/flavioribeiro/donut/internal/controllers/streamers.(*SRTMpegTSStreamer).Stream(0xc0002aae40, 0xc000100540)
app-1     | 	/usr/src/app/donut/internal/controllers/streamers/srt_mpegts.go:55 +0xa9 fp=0xc0001d7fa8 sp=0xc0001d7b00 pc=0xc5fa29

ref https://github.com/golang/go/issues/54690

If you're seeing the error "At least one invalid signature was encountered ... GPG error: http://security." when running the app

If you see the error "At least one invalid signature was encountered." when running make run, please run docker system prune and try again.

3.723 W: GPG error: http://deb.debian.org/debian bookworm InRelease: At least one invalid signature was encountered.
3.723 E: The repository 'http://deb.debian.org/debian bookworm InRelease' is not signed.
3.723 W: GPG error: http://deb.debian.org/debian bookworm-updates InRelease: At least one invalid signature was encountered.
3.723 E: The repository 'http://deb.debian.org/debian bookworm-updates InRelease' is not signed.
3.723 W: GPG error: http://deb.debian.org/debian-security bookworm-security InRelease: At least one invalid signature was encountered.
3.723 E: The repository 'http://deb.debian.org/debian-security bookworm-security InRelease' is not signed.
3.723 W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://archive.ubuntu.com/ubuntu focal InRelease: At least one invalid signature was encountered.
3.723 W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://security.ubuntu.com/ubuntu focal-security InRelease: At least one invalid signature was encountered.

If you're seeing the error "failed to copy files: userspace copy failed: write" when running the app

If you see the error "failed to copy files: userspace copy failed: write" when running make run, please run docker system prune and try again.

 => CANCELED [test stage-1 6/6] RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.55.2                                     4.4s
 => ERROR [app stage-1 6/8] COPY . ./donut                                                                                                                                                               4.1s
------
 > [app stage-1 6/8] COPY . ./donut:
------
failed to solve: failed to copy files: userspace copy failed: write /var/lib/docker/overlay2/30zm6uywrtfed4z4wfzbf1ema/merged/usr/src/app/donut/tmp/n5.1.2/src/tests/reference.pnm: no space left on device
make: *** [run] Error 17