measuring FPS of a source live stream (using identity elements)

[Matt Feury]

Thanks Nicolas for the response. I'm trying to avoid using fpsdisplaysink
because i want to measure fps just after the source of the pipeline (and
not the sink). Additionally, I want to be able to get the FPS via a
property which fpsdisplaysink doesn't support.

Matt

On Fri, Mar 17, 2023 at 10:01 AM Nicolas Dufresne <nicolas at ndufresne.ca>
wrote:

> Le jeudi 16 mars 2023 à 17:43 -0400, Matt Feury via gstreamer-devel a
> écrit :
>
> hello all,
>
> i am attempting to measure FPS of a source stream (e.g. rtsp or hls). I am
> currently using an identity element immediately after the source element
> (e.g. rtspsrc -> identity -> decodebin -> fakesink). Using the handoff
> signal on identity, I am able to get a good calculation of buffers per
> second.
>
> However, it seems that this value is not always 1:1 with frames per
> second. It very frequently is on stable streams (e.g. I often see 29-31
> buffers/sec on a 30fps stream). However, on streams with intermittent
> connectivity, it doesn't seem to tell the whole story.
>
> I've seen fpsdisplaysink which actually works really well (I am able to
> see "real" fps values that are dynamically changing as the pipeline plays).
> However, a) I don't want to measure the fps at the sink (i have a tee'd
> pipeline with multiple sinks and more interesting in measuring source fps
> than that of my pipeline) and b) this element seems to just overlay it –
> ideally i would be able to get the average "recent" fps as a property.
>
>
> Just set sync=false on fps display sink, and it will include the source
> jitter. I strongly recommend using fakevideosink for that, as it will avoid
> software copies with HW decoders.
>
>
> I've seen ridgerun's gst-perf element, but that only seems to log values.
>
> Is there a recommended approach to monitoring "real" FPS of an incoming
> live stream? Ideally using identity, but open to other options.
>
> Thanks,
> Matt
>
>
>
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