[BUG]Egress server continues capturing black images after video stops publishing

[leejiliang]

Describe the bug
When I send a timed screenshot request to the Egress server, I notice that the server continues to capture images even after the video stream stops publishing. However, the generated images are all completely black.

I would like to know if this is the intended behavior. Should the Egress server automatically stop capturing images when no video is being published? Alternatively, could you provide an API for developers to explicitly signal the Egress server to stop at an appropriate time?

Egress Version
docker hub image livekit/egress:latest

Egress Request
req := &livekit.RoomCompositeEgressRequest{} req.RoomName = "LOTUS-test-ljl" req.ImageOutputs = []*livekit.ImageOutput{ { CaptureInterval: 10, FilenamePrefix: "livekit/egress-image/", FilenameSuffix: livekit.ImageFileSuffix_IMAGE_SUFFIX_INDEX, Output: &livekit.ImageOutput_AliOSS{ AliOSS: &livekit.AliOSSUpload{ AccessKey: "LTxxxxxxxxSN", Secret: "xrFyyyyyyyyyibeEyvlU", Region: "cn-hangzhou", Endpoint: "https://oss-cn-hangzhou.aliyuncs.com", Bucket: "loxxxxxxco", }, }, }, } egress, err := EgressClient.StartRoomCompositeEgress(context.TODO(), req)

Additional context
black picture

Logs
Post any relevant logs from the egress service here.

[mpisat]

egress generates video_test_src to ensure there is always video track available, so when you stop, it may be falling back to that. I'm not sure if this is the intended behavior but you can always stop egress when publisher stops.

[leejiliang]

egress generates video_test_src to ensure there is always video track available, so when you stop, it may be falling back to that. I'm not sure if this is the intended behavior but you can always stop egress when publisher stops.

Egress is a server for every room in LiveKit. I can't stop it when a room stops publishing video; it should keep running always.

[mpisat]

I don’t mean to stop egress service. I mean stop egress track rtmp output with api call

[leejiliang]

I don’t mean to stop egress service. I mean stop egress track rtmp output with api call

Is there an API that supports this operation? I couldn't find it in the documentation.

[mpisat]

I’m able to kill egress by id using lk cli tool so I’m sure there is an api for it.

[mpisat]

https://docs.livekit.io/home/egress/api/
check out StopEgress section @leejiliang