Jianhui Dai 4d752ec647 [rtc_tools/video_encoder] Support Y4M file input
This CL adds `Y4mFrameGenerator` to support Y4M file input.

Bug: webrtc:15210
Change-Id: If21e40a609b3c6f980a413fb183cd4dfb5123aab
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/311520
Commit-Queue: Jianhui J Dai <jianhui.j.dai@intel.com>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40460}
2023-07-24 04:35:43 +00:00
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