QTMultimedia FFMPEG backend preview

sethsource · 1 May 2023, 22:46

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sethsource · wrote on 5 Jan 2023, 22:47

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sethsource · wrote on 10 Jan 2023, 17:08

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sethsource · wrote on 13 Jan 2023, 15:23

buimp .

SGaist · 16 Jan 2023, 15:14

Hi,

Did you check whether the plugin was deployed ?
If not, did you try to build it yourself ?

sethsource · 16 Jan 2023, 16:36

@SGaist How would i check to see if it's deployed? and also there's no instructions anywhere on how to build the preview with FFMPEG included

JoeCFD · wrote on 16 Jan 2023, 16:36

@sethsource from Qt6.5, FFMPEG comes as default. Check the folder /plugins/multimedia and you will be able to see the plugin is there. If you use Qt6.4, you have to set QT_MEDIA_BACKEND. From all changes they are making, you may not be surprised by issues. Qt6.5 is under beta and Qt6.6 is under dev. I guess you have to be patient with this app.

sethsource · wrote on 17 Jan 2023, 15:02

QT6.4 didnt work with FFMPEG out of the box, as well as 6.6. I'll try 6.5.

sethsource · wrote on 17 Jan 2023, 16:25

Okay now we're getting somewhere. QT6.5 with msvc allows me to run my program without yelling at me. only thing now is it seems it wants me to specify a "decoding framework". heres the output:

Cant seem to find any environment variables on the internet that i can use.

Available HW decoding frameworks:
dxva2
d3d11va

sethsource · wrote on 17 Jan 2023, 16:43

I read on an ffmpeg forum that people make the use of dxva2 and d3d11va through a command line argument for video...
"ffmpeg -hwaccel dxva2 -threads 1 -i INPUT -f null - -benchmark"

but this is completely unrelated to QT. I attempted to use an envar for hwaccel and using command line arg and no difference.