FPS drop using GStreamer

[AdrienPapin]

Hello, I’m new to OvenMediaEngine.
I’m trying to stream a RTMP output using GStreamer (gst.h c++) and a RTSP input.

I use gst_parse_launch on this pipeline :

const gchar* pipelineDesc = "
rtspsrc location=rtsp://input is-live=true latency=0 protocols=tcp ! 
decodebin ! x264enc ! flvmux streamable=true ! 
rtmpsink location=rtmp://output";

I got no problem during the parse_lauch but on the player I get very few frames
Can someone explain to me if I did something wrong with the pipeline or if it comes from somewhere else ?

[naanlizard]

To be clear, you are using a setup like this RTSP source ->Gstreamer-RTMP-output-from-Gstreamer->OME How are you playing the stream from OME? If WebRTC, sounds like you have B frames, check the docs

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[antonymarion]

@naanlizard I have a similar issue with gstreamer and ome

Do you know if it is possible to get rid of b frames with gstreamer by transcoding the stream on the fly ?

[naanlizard]

No idea how gstreamer works, but it's preferable to remove the b frames at the original encoding if you can

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On Thu, Nov 21, 2024 at 14:57 antonymarion ***@***.***> wrote: @naanlizard <https://github.com/naanlizard> I have a similar issue with gstreamer and ome Do you know if it is possible to get rid of b frames with gstreamer by transcoding the stream on the fly ? — Reply to this email directly, view it on GitHub <#1742 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABV4BWNDIAVIYPZMHKYUR2L2BY3JNAVCNFSM6AAAAABSHKXLHKVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCMZUGA3TQMY> . You are receiving this because you were mentioned.Message ID: ***@***.*** com>

[bchah]

I think you can set flags on x264enc, e.g.

const gchar* pipelineDesc = "
rtspsrc location=rtsp://input is-live=true latency=0 protocols=tcp ! 
decodebin ! x264enc bframes=0 key-int-max=60 ! flvmux streamable=true ! 
rtmpsink location=rtmp://output";

[antonymarion]

Thks a lot @bchah

[AdrienPapin]

Thx for the fix :)