Playback fails on unsupported container

[kentuckyfriedtakahe]

The Shaka Player demo at doesn't work on Firefox unless you disable WebM support by setting media.webm.enabled=false in about:config

Steps To Reproduce:

• Load Firefox nightly 48
• Navigate to http://shaka-player-demo.appspot.com/demo/
• Click on Load

Expected Results:
MP4 video should play

Actual Results:
WebM video attempts to play but fails to do so because Firefox does not support CENC in WebM.

See https://bugzilla.mozilla.org/show_bug.cgi?id=1257716

[tdrews]

Hi,

With 48.0a1 (2016-04-18) and media.webm.enabled=true, "Angel One" begins playback (although there seems to be some other issue (perhaps MSE related) that causes playback to stall). Which piece of content are you having trouble with?

[cpeterso]

I filed Firefox bug 1265512 to track the "Angel One" stall. This seems like a recent issue in Firefox and/or Shaka because I know I've tested all these videos in Firefox before. The "Sintel (multicodec)" video also stalls, 100% reproducible in Firefox 45–48 on OS X.

[tdrews]

Thanks @cpeterso

[cpeterso]

btw, the "Angel One" and "Sintel 4k" stalls are Firefox bug 1261900, reported by modmaker.

[kentuckyfriedtakahe]

Sorry - I should've been more specific. Sintel 4k (multicodec, widevine) doesn't work when media.webm.enable=true and media.mediasource.webm.enable=true because it tries to play Widevine WebM which is not supported.

[cpeterso]

Shaka assumes Widevine support implies WebM support. Firefox (Nightly) just landed supported Widevine, but only in MP4 for now.

[tdrews]

Yes, I see the problem. We'll look into reworking our support reporting system to handle this scenario.