Aha, so this is a HEVC video [1] which we only *just* started supporting and only on macOS, in bug 1924066. Fix range (containing only that bug): https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=af3032626a68b96b683ca4359802fc025da8e08c&tochange=2ab38f908263fc74938c293fca89c0336c78aedc That explains the variable support between the same browser on different platforms that I observed above. I think we can consider this an instance of bug 1889731 then. [1] confirmed with mplayer on linux which has this in its terminal output when playing this video: `VIDEO: [HEVC] 960x540 24bpp 23.976 fps 889.3 kbps (108.6 kbyte/s)`
Bug 1941740 Comment 4 Edit History
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Aha, so this is a HEVC video [1] which we only *just* started supporting and only on macOS, in bug 1924066. I get this fix range for dennys.com starting to work on macOS (which contains only that one bug to enable HEVC support): https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=af3032626a68b96b683ca4359802fc025da8e08c&tochange=2ab38f908263fc74938c293fca89c0336c78aedc That explains the variable support between the same browser on different platforms that I observed above. I think we can consider this an instance of bug 1889731 then. [1] confirmed with mplayer on linux which has this in its terminal output when playing this video: `VIDEO: [HEVC] 960x540 24bpp 23.976 fps 889.3 kbps (108.6 kbyte/s)`