but I don't remember what thread.

https://forums.opera.com/topic/21440/solved-using-sandboxie-to-open-opera/2 shows how to add file access permissions to sandboxie. I'd guess for your problem, you'd have to add entries for both of Opera's appdata folders.

@burnout426 i think i found the problem. i was running opera in sandboxie. when i run it outside of sandboxie, the video plays.

Okay. I think that means you have to tell sandboxie to give "C:\users\yourname\AppData\Roaming\Opera Software\Opera Stable" and "C:\users\yourname\AppData\Local\Opera Software\Opera Stable" full disk (read and write) permissions, or something like that. I remember someone else on the forums having an issue with sandboxie, but I don't remember what thread.

Let's rule out your Opera profile too. Download the Opera installer, launch it, click "options", set "install path" to a folder on your desktop, set "install for" to "Standalone Installation (USB)" and install.

Test in that Opera. If it works fine there, something is just messed up with your original Opera profile.

if i right click, inspect element in the black window, i get:

/* margin: 0px; */

}
user agent stylesheet
body:-webkit-full-page-media {
background-color: rgb(0, 0, 0);
}
user agent stylesheet
body {
display: block;
margin: 8px;

Go to here, right-click the video, choose "save video as" and save it to your desktop.

Or, right-click the link on here and choose to save the file to your desktop.

@leocg i used opera's search and found something close, but the same and it doesn't play properly.
yes, the video does play on Windows Media Player.

But, it still doesn't look like you downloaded the mp4 file and opened it with Opera to test playing the file off of your hard drive.

Go to here, right-click the video, choose "save video as" and save it to your desktop. Then you need to open it with Opera. While Opera is open, drag the mp4 file to Opera's taskbar button, continue dragging to Opera's window and then release. That'll open it with Opera. Or, do the ctrl + o way in Opera and open it in Opera that way. If doing either of those opens Windows Media Player, then something is wrong.

btw, how did you get the url of the video by itself?

Visit the page and hit ctrl + shift + i to open the developer tools. Switch to the Network tab and check "disable cache". Then, press F5 to reload the page. Then, click the "Media" filter at the top. Then, look for the link to the video in the results, right-click it and copy or open in a new tab.

yes, the video does play on Windows Media Player.

Does the video play on Windows Media Player?

i can't find the url, that burnout426 found, in the page source.

when i ctrl-o to the file he found opera switches to video player, but nothing plays.

how did you get the url of the video by itself?

Right click on the page > View page source sometimes help. You can use an extension too.

@alk4444 said in video format not supported:

what is ctrl + o supposed to do?

Open a dialog for you to choose a file to be opened in Opera.

btw, how did you get the url of the video by itself?

what is ctrl + o supposed to do?

Does it play then? If it does, then we at least know your Opera is capable of parsing the file and playing its parts. That would mean then that it's some issue with parsing and playing the bits on the fly while it's streaming. Could be a firewall and or antivirus issue then. Or, it could be a proxy issue.

error: MFDemuxer: open stream failed
pipeline_error: DEMUXER_ERROR_COULD_NOT_OPEN

This is the reason for the video doesn't play. What is causing it may be a mistery.

Can you see videos on other sites?

render_id: 28
player_id: 0
origin_url: https://video-http.media-imdb.com/
frame_url: https://video-http.media-imdb.com/MV5BMzY0ODI0MjMzMF5BMTFeQW1wNF5BbWU4MDU5Njc0NzAx.mp4?Expires=1510437061&Signature=RtVw1gDHfnWxiEZCita5YfNHOwQrmed9iFxHQu7CSam0f28Af-gYhz1Q~gOFeEmalOLHRnNT89URyoPsyEUpvzKhM08-DKFuHCoD8LD63Mt62dOTtyGy5FkgmyAbD~MBF1BOIhsIDkJ2XihW9hqPlSH5lhEr2knEh9zKZBn-bW8_&Key-Pair-Id=APKAILW5I44IHKUN2DYA
frame_title:
url: https://video-http.media-imdb.com/MV5BMzY0ODI0MjMzMF5BMTFeQW1wNF5BbWU4MDU5Njc0NzAx.mp4?Expires=1510437061&Signature=RtVw1gDHfnWxiEZCita5YfNHOwQrmed9iFxHQu7CSam0f28Af-gYhz1Q~gOFeEmalOLHRnNT89URyoPsyEUpvzKhM08-DKFuHCoD8LD63Mt62dOTtyGy5FkgmyAbD~MBF1BOIhsIDkJ2XihW9hqPlSH5lhEr2knEh9zKZBn-bW8_&Key-Pair-Id=APKAILW5I44IHKUN2DYA
total_bytes: 30969947
streaming: false
single_origin: true
passed_cors_access_check: false
range_header_supported: true
pipeline_state: kStopped
error: MFDemuxer: open stream failed
pipeline_error: DEMUXER_ERROR_COULD_NOT_OPEN
event: WEBMEDIAPLAYER_DESTROYED

00:00:00 00 origin_url https://video-http.media-imdb.com/
00:00:00 00 frame_url https://video-http.media-imdb.com/MV5BMzY0ODI0MjMzMF5BMTFeQW1wNF5BbWU4MDU5Njc0NzAx.mp4?Expires=1510437061&Signature=RtVw1gDHfnWxiEZCita5YfNHOwQrmed9iFxHQu7CSam0f28Af-gYhz1Q~gOFeEmalOLHRnNT89URyoPsyEUpvzKhM08-DKFuHCoD8LD63Mt62dOTtyGy5FkgmyAbD~MBF1BOIhsIDkJ2XihW9hqPlSH5lhEr2knEh9zKZBn-bW8_&Key-Pair-Id=APKAILW5I44IHKUN2DYA
00:00:00 00 frame_title
00:00:00 04 url https://video-http.media-imdb.com/MV5BMzY0ODI0MjMzMF5BMTFeQW1wNF5BbWU4MDU5Njc0NzAx.mp4?Expires=1510437061&Signature=RtVw1gDHfnWxiEZCita5YfNHOwQrmed9iFxHQu7CSam0f28Af-gYhz1Q~gOFeEmalOLHRnNT89URyoPsyEUpvzKhM08-DKFuHCoD8LD63Mt62dOTtyGy5FkgmyAbD~MBF1BOIhsIDkJ2XihW9hqPlSH5lhEr2knEh9zKZBn-bW8_&Key-Pair-Id=APKAILW5I44IHKUN2DYA
00:00:00 133 total_bytes 30969947
00:00:00 133 streaming false
00:00:00 133 single_origin true
00:00:00 133 passed_cors_access_check false
00:00:00 133 range_header_supported true
00:00:00 144 pipeline_state kStarting
00:00:00 145 error MFDemuxer: open stream failed
00:00:00 145 pipeline_error DEMUXER_ERROR_COULD_NOT_OPEN
00:00:00 145 pipeline_state kStopping
00:00:00 145 pipeline_state kStopped
00:00:22 846 event WEBMEDIAPLAYER_DESTROYED

there are no error messages, but all the entries end with ' WEBMEDIAPLAYER_DESTROYED'

No error message on opera://media-internals/?