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. ĸen -- Truth, in front of her huge walk-in wardrobe, selected black leather boots with stiletto heels for such a barefaced truth. - Unseen Academicals -- http://lists.linuxfromscratch.org/listinfo/blfs-support FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
