observing failures for few other tests as well.
https://wmatrix.googleplex.com/unfiltered?hide_missing=True&tests=video_VideoSeek
https://wmatrix.googleplex.com/unfiltered?hide_missing=True&tests=video_ChromeVidResChangeHWDecode
https://wmatrix.googleplex.com/unfiltered?hide_missing=True&tests=video_VideoReload.vp8
https://wmatrix.googleplex.com/unfiltered?hide_missing=True&tests=video_VideoReload.vp9
https://wmatrix.googleplex.com/unfiltered?hide_missing=True&tests=video_VideoReload.h264

I have ran video_VideoReload.h264 test on local device and lab device on M55-8844.0.0.

Test passed on local device but failing on lab device. As per the error, Some how video playback is not starting in lab device. Same behavior for video_YouTubeHTML5 test. 

Could you please provide logs from the failed run? Thank you.

Logs from lab devices.
https://storage.cloud.google.com/chromiumos-test-logs/bugfiles/cr/650739/videoreloadtestresults.tar.gz?_ga=1.148582256.638514659.1473964875
https://storage.cloud.google.com/chromiumos-test-logs/bugfiles/cr/650739/YoutubeHTML5results.tar.gz?_ga=1.148582256.638514659.1473964875

video_YouTubeHTML5:

09/30 14:17:52.811 ERROR|        site_utils:0932| Video failed to load. Player expected status: Playing and current status: Unstarted.

It looks like the access to the video in the test (http://www.youtube.com/embed/50MukADPNCA?enablejsapi=1&html5=1) might have been restricted. Could we change the video in the test?

but the same video is working fine as test passing on M54 builds.

And for other failed tests video_VideoReload.*, we are using videos from google storage.