I found that there are two different issues here. On OSX, the problem is that we ended the video promise too early, so that we couldn't show the last frame with enough duration. The issue reported in this bug is this one. On Linux, we got another issue, which is the video playback can't start properly. The playback would stop immediately after we start the video. The reason is that the video frames decoder returned have incorrect duration `0`.
Bug 1552354 Comment 2 Edit History
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I found that there are two different issues here. Both of them are not related with looping, you can reproduce the issue via visiting video url [1] directly. On OSX, the problem is that we ended the video promise too early, so that we couldn't show the last frame with enough duration. The issue reported in this bug is this one. On Linux, we got another issue, which is the video playback can't start properly. The playback would stop immediately after we start the video. The reason is that the video frames decoder returned have incorrect duration `0`. [1] https://video.twimg.com/tweet_video/D6uEne2VsAAXGpp.mp4