James Pearson wrote:
We've just moved to ESR 45 from ESR 38 on a number of Macs, but are
having problems playing back Quicktime videos - the 'error' is 'Video
can't be played because the file is corrupt'
However, setting the preference media.mp4.enabled to false, allows these
Quicktimes play
Unfortunately, this setting means that mp4 videos no longer play ...
This wasn't a problem with ESR 38 - and Firefox 48 doesn't have this
problem either
I've found the following:
https://support.mozilla.org/en-US/questions/1115863 which states:
Starting in Firefox 45, media sent with the video/quicktime content
type is treated as MP4 media to be handled by the built-in HTML5
video player. But MOV files can contain a variety of different
encodings, they are not all MP4.
Does anyone know of a work around for this problem with ESR 45 ?
It looks like this is a bug/regression that was introduced in Firefox 45
- and a fix was added to Firefox 47 (BZ # 1251184
<https://bugzilla.mozilla.org/show_bug.cgi?id=1251184>)
I've managed to 'fix' the problem by binary hacking the XUL library
(Firefox.app/Contents/MacOS/XUL) and replacing the string
'video/quicktime' with something that fails to match the Quicktime MIME
type - e.g. 'video/Ignore_QT'
With this hacked XUL library, we can now play Quicktimes and mp4 videos
with ESR 45
James Pearson
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