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glvideomixer: Fixing error with mouse navigation events when no pixel-aspect-ratio

Rubén Gonzalez requested to merge rgonzalez/gstreamer:hotfix_glvideomixer_no_pixel-aspect-ratio into main

Handling mouse navigation events in glvideomixer element, if no pixel-aspect-ratio info in the caps, an assertion error is produced inside gst_util_fraction_multiply because default denominator is zero.

Error fixed:

(gst-launch-1.0:102654): GStreamer-CRITICAL **: 00:47:51.598: gst_util_fraction_multiply: assertion 'b_d != 0' failed

Simple pipeline to reproduce the issue:

gst-launch-1.0 -v glvideomixer name=mix ! glimagesinkelement  gltestsrc  ! mix.sink_0

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