How to control the frame rate in a gstreamer pipeline?

Question

I have astream encoded in 60fps, but my gstreamer pipeline is playing it in fps, so the video appears to be very slow. I have created a gstreamer pipeline as

appsrc name=src ! video/x-h264 ! decodebin ! autovideosink sync=false

The appsrc will push buffers into the decoder. Now I want to force some frame rate for the video that I am playing. I tried inserting a videorate in between decodebin and autovideosink. But it didnt work. Then I inserted framerate=30/1 for forcing the framerate as 30fps.. But that also didnt work; So how to force the framerate for the decoder in gstremer pipeline ?

Xanthous

Answer 1

Without seeing the other pipelines you have tried, I came up with this:

gst-launch-1.0 filesrc location=movie.avi ! decodebin ! \
videorate ! "video/x-raw,framerate=5/1" ! autovideosink

movie.avi contains a 30fps video which is then fixed to 5fps before being displayed.

Abell

Would you explain why do we need double quotatopm in framerate parameter? – Heracliteanism

I don't think you need them, I just add them. – Abell

Humm...I am confused. Do you mean I need "video/x-raw,framerate=5/1" or video/x-raw,framerate=5/1 is also fine? – Heracliteanism

Yes, I think it doesnt matter – Kentigera

It's not strictly necessary, but sometimes caps filters have parentheses in them (ex: video/x-raw(memory:NVMM)) so you either need to escape them \( \) or put the caps filter in quotes. I tend to wrap my caps filters in quotes for this reason, but if there are no objectionable characters in your launch string, it's fine to omit the quotes. – Neely

Answer 2

As another answer said, add element videoscale after decodebin and add capfilter to specify framerate.

Add property max-rate to videoscale works as well.

gst-launch-1.0 filesrc location=movie.avi ! decodebin ! \
videorate max-rate=5 ! autovideosink

Vehicle