Video resolution

[jmmena]

Tilman, great work!
This isn´t a issue. I´ve tested the scritp and it works ok.
Only one question: the output video resolution is 800x600. I wonder if it would be possible to configure the script for another type of resolution, for example 1280x720. This is the deskshare.webm original file resolution (in the example i´ve tested).
thanks in advance

[tilmanmoser]

Hi. Video resolution is derived from the viewport settings in shapes.svg as set by big blue button itself; i.e. different presentations may have different video resolutions. The presentation video is created by taking screenshots from this file in a headless chromium browser. Setting another viewport could result in odd aspect ratios. But you could resize the whole video with ffmpeg easily afterwards.

[jmmena]

Hi! Ok, that´s clear.
Thanks for your answer (and for the script)

[tilmanmoser]

Just to make that point clear: I marked this as an enhancement, since I understand that it would be good to have some control over the resulting video resolution. It's just not trivial and I add it to the mabe-later-list :-)

[osintaras]

Thank you for your good work!
Please tell me in which file you can change the resolution of the final video, while you have not done it yet?

[tilmanmoser]

Hi @osintaras - I'm currently not intending to build this into the script, since there are two issues with it:

1. If the desired video resolution is higher than the actual source material, it would result in a grainy video, which is not desired.
2. Resizing the video during composition results in ffmpeg reencoding the whole video, which results in significant longer run time and resource usage.

I suggest you resize the video after creation with a command like ffmpeg -i video.mp4 -vf scale=320:-2 video2.mp4, which would render the video to a width of 320px while preserving the aspect ratio.

[osintaras]

Hi @osintaras - I'm currently not intending to build this into the script, since there are two issues with it:

1. If the desired video resolution is higher than the actual source material, it would result in a grainy video, which is not desired.
2. Resizing the video during composition results in ffmpeg reencoding the whole video, which results in significant longer run time and resource usage.

I suggest you resize the video after creation with a command like ffmpeg -i video.mp4 -vf scale=320:-2 video2.mp4, which would render the video to a width of 320px while preserving the aspect ratio.

Hi @tilmanmoser.
If i open bbb presentation on my computer in browser with resolution 1920x1080 and will record screen, then result video have better quality and resolution than 800x600. Because text, cursor and other vector elements have full resolution that gives browser. If your wonderful script had the ability to configure the resolution of the virtual browser in which the video will be captured, this would be great!
Resizing video after creation is an artificial way. The video won't get any better.

[parreitu]

Hi @tilmanmoser

I agree with @osintaras , it'd be great it we could configure the resolution of the virtual browser in order to change the resolution of the result video.

Thanks for your great job !