From Newsgroup: alt.os.linux


Why would a video of any resolution made with kdenlive and linked on a
web page not fill the Firefox web navigator window on a 4k monitor?

the code is as simple as it gets:

<a href="videoname.webm">videoname.webm</a>





--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: alt.os.linux

On Sun, 5/17/2026 10:53 PM, bad sector wrote:

Why would a video of any resolution made with kdenlive and linked on a web page not fill the Firefox web navigator window on a 4k monitor?

the code is as simple as it gets:

<a href="videoname.webm">videoname.webm</a>

I'm not much of a video person, and my collection of samples
is pretty small.

*******

Have you used any other tools to check the video and audio
stream details of the project ?

ffmpeg
ffplay
ffprobe

ffprobe.exe key01.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'key01.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2015-05-04T17:26:26.000000Z
Duration: 02:55:10.32, start: 0.000000, bitrate: 5001 kb/s
Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
Metadata:
creation_time : 2015-05-04T17:26:26.000000Z
handler_name : Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]

Stream #0:1(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720
SAR 1:1 DAR 16:9, 4869 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
creation_time : 2015-05-04T17:26:26.000000Z
handler_name : Mainconcept MP4 Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding

You can see that video is 1280x720, and playing it on a 4K monitor
requires the player wrapper frame to declare a somewhat larger value
if I wanted it to fill the screen.

I've seen other videos like that, 720x480, and those get scaled
quite a bit, to not fill a 4K monitor, but to be significantly
larger than the encoded format.

I would be careful about assuming every video ever made,
is actually natively 3840x2160 or something. That hardly
ever happens, because the cameras aren't good enough for that.
A RED 8K camera could likely make a nice 4K video. It might not
be as sharp as a tack though, it might betray the 8K origin.
I've tried a few RED samples, ones which were just dreadful
(creators at fault), and this is really the only decent one.

Name: epicw8k-standard-24fps-7to1redcode_16x9.zip 8192x4320 @ 23.976 FPS (153 frames, 6.09 seconds)
Size: 1478855973 bytes (1410 MiB)
SHA256: 81DC8B50B878A43FAC699213368E4A5452C7789AB7BC7EAA4813A6AE2CE6C152

Needs a RED provided program to read the file. FFMPEG cannot
handle it. I converted it to an MP4 with the RED software.
There is no sound track. It's a scene of Hong Kong, collected at night.
There are cars driving on the street. Everything is lit up, animated
billboards and such.

ffprobe movie.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'movie.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.29.100
Duration: 00:00:06.38, start: 0.000000, bitrate: 16095 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 3840x2160
SAR 16:15 DAR 256:135, 16091 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
Metadata:
handler_name : VideoHandler
vendor_id : [0][0][0][0]

That's one of the few 4K video samples I've got :-)
When I used ffplay on it, my screen is HIDPI and is set to 200%,
because it is only 27 inches and not the correct dimension
for a good 4K screen. Most of the video goes off the screen with
ffplay.exe, I have to bring up Task Manager and kill it so I
can use my screen again after the 6 second movie.

I could do this on a Linux setup too, but the monitors are
smaller elsewhere in the room, so it's not the same.

Summary: Dump the metadata on the sample and see what's up.

Paul
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: alt.os.linux

On Sun, 5/17/2026 10:53 PM, bad sector wrote:

Why would a video of any resolution made with kdenlive and linked on a web page not fill the Firefox web navigator window on a 4k monitor?

the code is as simple as it gets:

<a href="videoname.webm">videoname.webm</a>

OK, let's play with it now.
I have my six second movie, 3840x2160 or so. The derivative of the RED short clip.
I can do anything I want with it now.
I can code WWW, I know I can do this, it's like Hello World only several lines longer.

firefox test.htm

Current working directory contents:

432 May 18 00:37 test.htm
12,826,013 Mar 16 2022 movie.mp4

I got the idea for my wrapper, from here.

https://www.w3schools.com/html/html5_video.asp

I used Seamonkey Composer, which made a mess, but I waded in
with a text editor and cleaned it up a bit.

********************** test.htm **********************************

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>test.htm</title>
</head>
<body>
<video width="1440" height="900" controls>
<source src="movie.mp4" type="video/mp4">
<source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>
</body>
</html>

********************** END test.htm ******************************

I have a movie that seems to play.
Maybe I'm supposed to wrap that "Your browser" line with something... :-)
Like I know how to code a web page o.O .

Even though my wrapper window is smaller than the video, it
handled it without whining.

Paul
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: alt.os.linux

On 2026-05-18 04:53, bad sector wrote:

Why would a video of any resolution made with kdenlive and linked on a
web page not fill the Firefox web navigator window on a 4k monitor?

the code is as simple as it gets:

<a href="videoname.webm">videoname.webm</a>

What does "not fill" mean? Do you see black borders up, down, left, and
top? If you see black borders or window borders on all four edges simultaneously, then there is a problem.

If the video fills left and right to the edge, but not up-dn, then there
is no problem.

You did not say the pixel count of the video.
--
Cheers, Carlos.
ESEfc-Efc+, EUEfc-Efc|;
--- Synchronet 3.22a-Linux NewsLink 1.2