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#1 2025-10-23 02:52:04

vindicator
Member
Registered: 2016-02-25
Posts: 30

VLC Transform 90 Degrees Or 270 Degrees Using GStreamer Plug-In Issue

When playing a video, the video disappears when I transform 90/270 degrees (180 is fine).
This only happens using `vlc-plugin-gstreamer`. If I use `vlc-plugin-ffmpeg`, it works fine.


The original issue was `VLC could not decode the format "h264" (H264 - MPEG-4 AVC (part 10))`, and I saw the ffmpeg plugin was a solution.
However when I noticed a ffmpeg-4.4 dependency, I opted to try gstreamer instead. This is when I encountered this issue.

I thought I'd check here first to see if I'm the only one before submitting a bug report to vlc.

As an aside (in the same vain), while working through the issue, I saw the list of plug-ins in vlc and there were scores attributed to them.
I think gstreamer was like 50, and ffmpeg was crazy high like 10010.
That makes me think that ffmpeg would always be used over gstreamer (don't know if gst provides anything that ffmpeg does not), and I saw no capability of changing scores.

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#2 2025-10-23 06:29:08

unixman
Member
Registered: 2015-03-12
Posts: 181

Re: VLC Transform 90 Degrees Or 270 Degrees Using GStreamer Plug-In Issue

how about mpv? mpv is superior than vlc and use ffmpeg libs under the hood.
So all ffmpeg filters available for free.

transforming 180 is cheap but 90/270 is costly require more processing;  you can quess why.

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#3 2025-10-23 07:06:01

vindicator
Member
Registered: 2016-02-25
Posts: 30

Re: VLC Transform 90 Degrees Or 270 Degrees Using GStreamer Plug-In Issue

Eh... it isn't all that GUI-friendly, but I can see the appeal, as I take a closer look again.
It's the keybindings that are overwhelming at first, but some of them make sense, and I presume I can edit some config to make my own bindings.
I may stick with it, but still, it's not a focus on the issue.

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#4 2025-10-23 10:46:44

unixman
Member
Registered: 2015-03-12
Posts: 181

Re: VLC Transform 90 Degrees Or 270 Degrees Using GStreamer Plug-In Issue

transforming  90/270 means aspect ratio change and resolution change  almost all case.
So frames needs to be scaled if it cant fit screen as is.
i quess ffmpeg scale it automatically  but gstreamer needs manual  intervention.

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#5 2025-10-23 10:54:42

vindicator
Member
Registered: 2016-02-25
Posts: 30

Re: VLC Transform 90 Degrees Or 270 Degrees Using GStreamer Plug-In Issue

All I'm looking for is confirmation from others that also experience this issue, justifying my purpose to submit a bug report to vlc.
And for others, just to be clear, the ffmpeg plugin must NOT be installed. Just the gstreamer one.

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