Avoid relying on PyAV-provided video frame count #11165

Job	Run time
search_cache / search_cache	5s
build	15m 19s
unit_testing	24m 21s
e2e_testing (actions_tasks)	25m 11s
rest_api_testing	27m 27s
e2e_testing (actions_tasks2)	32m 22s
e2e_testing (actions_tasks3)	25m 26s
e2e_testing (actions_objects)	14m 30s
e2e_testing (actions_objects2)	22m 17s
e2e_testing (actions_users)	11m 27s
e2e_testing (actions_projects_models)	21m 8s
e2e_testing (canvas3d_functionality)	15m 14s
e2e_testing (canvas3d_functionality_2)	11m 48s
e2e_testing (issues_prs)	19m 21s
e2e_testing (issues_prs2)	22m 17s
e2e_testing (features)	13m 0s
generate_github_pages	3m 59s
codecov	11s
publish_dev_images	0s
	5h 5m 23s

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