Video file create with Gstreamer can't be played by Slack

[omer.tal]

Hello,

I was using the following pipeline to record my screen, and share it on
Slack, but it couldn't be played without actually downloading the file and
play it with external media player:

gst-launch-1.0 -e ximagesrc endx=1920 ! videoconvert ! x264enc ! mpegtsmux !
filesink location=OSD.mp4

What could it be?

Thanks



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