Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [ yes] I looked for a similar issue and couldn't find any.
- [ yes] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [ yes] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Detailed guidelines: http://gpac.io/bug-reporting/

ubuntu 22.04
gpac 2.3-DEV-rev621-g3edb48d2b-master

I use ```MP4Box -add  '/home/moebear/Downloads/DASH-SVC-Toolchain/demultiplex/a.264':svcmode=split a.mp4```

https://drive.google.com/file/d/1A06aGdBOQqQnBlwZbkkKmfaF8LwSbwOS/view?usp=sharing
link to a.264

https://github.com/gpac/gpac/wiki/SVC%20Support%20in%20MP4Box#svc-and-l-hevc-playback

Then I use ```gpac -play a.mp4``` . It pop 3 windows and then occurs many errors, and I cannot use the shortcut ctrl+h, ctrl+l to switch the layer.
Cannot switch svc layer
This is a GitHub Issue
repo:gpac
owner:gpac
Title : Cannot switch svc layer
Issue date:

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Thanks for reporting your issue. Please make sure these boxes are checked before submitting your issue - thank you!

- [ yes] I looked for a similar issue and couldn't find any.
- [ yes] I tried with the latest version of GPAC. Installers available at http://gpac.io/downloads/gpac-nightly-builds/
- [ yes] I give enough information for contributors to reproduce my issue (meaningful title, github labels, platform and compiler, command-line ...). I can share files anonymously with this dropbox: https://www.mediafire.com/filedrop/filedrop_hosted.php?drop=eec9e058a9486fe4e99c33021481d9e1826ca9dbc242a6cfaab0fe95da5e5d95

Detailed guidelines: http://gpac.io/bug-reporting/

ubuntu 22.04
gpac 2.3-DEV-rev621-g3edb48d2b-master

I use ```MP4Box -add  '/home/moebear/Downloads/DASH-SVC-Toolchain/demultiplex/a.264':svcmode=split a.mp4```

https://drive.google.com/file/d/1A06aGdBOQqQnBlwZbkkKmfaF8LwSbwOS/view?usp=sharing
link to a.264

https://github.com/gpac/gpac/wiki/SVC%20Support%20in%20MP4Box#svc-and-l-hevc-playback

Then I use ```gpac -play a.mp4``` . It pop 3 windows and then occurs many errors, and I cannot use the shortcut ctrl+h, ctrl+l to switch the layer.
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