Seneste svar på some MP4 not working at all in FFhttps://support.mozilla.org/da/questions/12954392020-07-20T01:06:42-07:00As a data point, it plays on Windows 10 x64 in Firefox 78. Maybe there is a difference in decoding s2020-07-20T01:06:42-07:00jscher2000https://support.mozilla.org/da/questions/1295439#answer-1334500<p>As a data point, it plays on Windows 10 x64 in Firefox 78. Maybe there is a difference in decoding support on Media Foundation in Windows 7 compared with Windows 10?
</p>Can I not say somehow to FF I want to use VLC as a player for embedded mp4 videos? That would solve 2020-07-20T00:51:30-07:00asv01https://support.mozilla.org/da/questions/1295439#answer-1334485<p>Can I not say somehow to FF I want to use VLC as a player for embedded mp4 videos? That would solve the problem.
</p>Tried but nothing is available for regular Win 7. I just tried to manually install FFmpeg. New profi2020-07-20T00:39:35-07:00asv01https://support.mozilla.org/da/questions/1295439#answer-1334477<p>Tried but nothing is available for regular Win 7. I just tried to manually install FFmpeg. New profile does not help, too.
</p><p>The above page says:
MP4/H.264 avc1.42001E, mp4a.40.2 probably
WebM VP8 vp8.0, vorbis probably
</p><p>and all other - supported.
</p>See also:
https://www.jeffersonscher.com/sumo/html5-video.html
2020-07-20T00:17:53-07:00cor-elhttps://support.mozilla.org/da/questions/1295439#answer-1334472<p>See also:
</p>
<ul><li><a href="https://www.jeffersonscher.com/sumo/html5-video.html" rel="nofollow">https://www.jeffersonscher.com/sumo/html5-video.html</a>
</li></ul>The video codec must be the same.
Perhaps you could find something like "win7 codec pack" or "media2020-07-20T00:07:04-07:00TyDraniuhttps://support.mozilla.org/da/questions/1295439#answer-1334470<p>The video codec must be the same.
</p><p>Perhaps you could find something like "win7 codec pack" or "media player codec pack" and update your codecs.
</p>As I said, I tried all of the above. This and all similar videos are not playing embedded using FF a2020-07-20T00:04:09-07:00asv01https://support.mozilla.org/da/questions/1295439#answer-1334469<p>As I said, I tried all of the above. This and all similar videos are not playing embedded using FF and in "Windows Media Player".
</p><p>At the same computer, VLC plays these videos perfectly just as FF and any other player do play any other mp4 perfectly.
</p><p>All online tests regarding MP4 I could find claim everything is perfectly OK with the FF.
</p>That video is a normal MP4 video without a sound track and plays without a problem.
Codec: H264 - M2020-07-19T23:50:56-07:00cor-elhttps://support.mozilla.org/da/questions/1295439#answer-1334465<p>That video is a normal MP4 video without a sound track and plays without a problem.
</p>
<ul><li>Codec: H264 - MPEG-4 AVC (part 10) (avc1)
</li></ul>
<p>See:
</p>
<ul><li><a href="https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows" rel="nofollow">https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows</a>
</li><li><a href="https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues" rel="nofollow">https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues</a>
</li><li><a href="https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox" rel="nofollow">https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox</a>
</li></ul>If I try to paste only the offending video link:
https://storage-lajkhr.index.hr/kiki/a727a5a6-734f-2020-07-19T23:38:57-07:00asv01https://support.mozilla.org/da/questions/1295439#answer-1334462<p>If I try to paste only the offending video link:
<a href="https://storage-lajkhr.index.hr/kiki/a727a5a6-734f-44d6-9ee8-42b857f22193.mp4" rel="nofollow">https://storage-lajkhr.index.hr/kiki/a727a5a6-734f-44d6-9ee8-42b857f22193.mp4</a>
</p><p>WWW Console does not do or say absolutely anything. Black square player frame with the length is only shown. I tried everything else, so the problem is with this particular format. I think something is not working at the OS level (Win7). So I went on to recheck my initial statement and found I was not perfectly precise! If I try to play this downloaded video from my computer using VLC (or other players) it plays perfectly fine. Just as any other MP4 video.
</p><p>But, if I try to play this downloaded video using the "Windows Media Player" which (I guess) comes with the Windows, then I can replicate the same behavior as in FF: almost all other MP4 videos play perfectly, but these tiny ones which look more like animated GIFs with 10 fps do not play at all.
</p><p>So, it looks like FF is using the same engine as the inbuilt "Windows Media Player". But I am unable to find how to point FF to something else which would work as evidenced by all the other players on the PC.
</p>Works for me in Firefox 52 ESR and 60 ESR and newer, so it looks like something on your setup.
You c2020-07-19T00:02:38-07:00cor-elhttps://support.mozilla.org/da/questions/1295439#answer-1334154<p>Works for me in Firefox 52 ESR and 60 ESR and newer, so it looks like something on your setup.
</p><p>You can check the Web Console for media related messages and make sure you have proper support for playing MP4.
</p>
<ul><li><a href="https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows" rel="nofollow">https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows</a>
</li><li><a href="https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues" rel="nofollow">https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues</a>
</li><li><a href="https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox" rel="nofollow">https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox</a>
</li></ul>OK. Open a WWW Console (Ctrl + Shift + K) and try to run a video. There should show up an error abou2020-07-17T23:24:51-07:00TyDraniuhttps://support.mozilla.org/da/questions/1295439#answer-1333882<p>OK. Open a WWW Console (Ctrl + Shift + K) and try to run a video. There should show up an error about it.
</p>But, since I asked for help... I downloaded and sandbox installed current version. Nothing changed. 2020-07-17T23:14:28-07:00asv01https://support.mozilla.org/da/questions/1295439#answer-1333880<p>But, since I asked for help... I downloaded and sandbox installed current version. Nothing changed. These videos do not play for me on this non-archaic version, too.
</p>No, I am trying to avoid new versions for many years now. I need something that might work in a back2020-07-17T22:58:41-07:00asv01https://support.mozilla.org/da/questions/1295439#answer-1333879<p>No, I am trying to avoid new versions for many years now. I need something that might work in a backup VM Win 7 on my servers.
</p><p>New versions are security risk as they introduce new problems all the time, are much slower and break backups. Also, I prefer not to buy a new computer every year again. I do not see how a version made this year can be called archaic. That means the program is terrible&nbsp;:)
</p>It's working in version 80, win 10.
We can't say anything about those archaic versions you mentioned2020-07-17T22:54:03-07:00TyDraniuhttps://support.mozilla.org/da/questions/1295439#answer-1333878<p>It's working in version 80, win 10.
</p><p>We can't say anything about those archaic versions you mentioned. Firstable I'd suggest you to update to a recent version.
</p>