Ken Moffat wrote:
On Mon, Nov 20, 2017 at 10:30:11PM +0000, Ken Moffat wrote:
On Fri, Nov 17, 2017 at 09:26:51AM +0100, Vaclav Masin wrote:
as the title suggests - mp4 videos don't seem to play for me since FF 57. See
this test site for an example:
https://www.quirksmode.org/html5/tests/video.html - the other two videos play
just fine but not the first one. Used to work in FF 56 and before without any
issues.
I get this message in the dev console: 'Specified “type” attribute of “video/mp4” is not
supported. Load of media resource ../videos/big_buck_bunny.mp4 failed' or on some other
sites messages like this: 'The video on this page can’t be played. Your system may not
have the required video codecs for: video/mp4;codecs="avc1.4d400d mp4a.40.2"
... ...'.
Well, after saying it worked for me I've now built a new system from
last week's svn books (everything was current, except that I held
off on icu because that has given problems in the past.). This is
on my intel i3 SandyBridge with intel video.
For that H264/MP4 link I get a sad face in the player on the page,
with most of the first line of an error message
No video with supported format and MIME Type found.
(cut off in the base lines of e.g. 'a' 'E' and wrapped after 'MIME'
because the player bar overlays that with a position/duration of
0:00 / 0:00, but message is all readable if I fullscreen in the
player)
[...]
Hmm, looking at that webpage, the type is "video/mp4", and on my
desktop that is set for parole. But as to why firefox now cannot
play it, no idea.
And another online mp4 video which wanted to download to open in
parole was also video/mp4.
I decided to try my earlier suggestion - I closed firefox and ran
strace -o mp4trace -ff firefox https://www.quirksmode.org/html5/tests/video.html
I had been going to start looking for xdg or mp4 in the trace files,
but the damned thing can now play video/mp4. And all I had done in
the meantime was install ruby and texlive from source (I use ruby to
test one of the supplied texlive scripts). Neither of those ought
to make a difference.
I've now repopened firefox and gone to that page - the green in top
left of the H264/MP4 video looks paler than in the other two
variants, but all are present.
Very Weird, but it again works for me.
Another weirdness- H264/MP4 has a time of 1:00, WebM a time of 1:02,
Ogg/Theora a time of 1:01.
Thinking about this, this machine has been up or sleeping since I
last rebooted. I suspect that when I had the problem I was using
firefox from before I built ffmpeg. I had assumed ffmpeg was just a
runtime dependency, but maybe firefox has to be restarted after it
is present.
Unfortunately, that is unliekly to help Vaclav - I think he already
had an older ffmpeg when he first noticed the problem.
Just a thought. Is it possible by installing another package it ran
ldconfig and allowed ff to pick up a library that it missed before?
-- Bruce
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