[vlc-devel] Bug-Report

[Steve Lhomme]

Also you should provide debug logs to see what is going on in your machine.

On 20/07/2026 08:25, Steve Lhomme wrote:
> Hello,
> 
> Can you report your issue here ? https://code.videolan.org/videolan/ 
> vlc/-/work_items
> Reports sent it will not be handled and forgotten.
> 
> Thanks in advance.
> 
> On 19/07/2026 13:49, Winfried Wacker via vlc-devel wrote:
>> Hello VLC developers,
>>
>> I would like to report what appears to be a reproducible issue with 
>> AV1 playback.
>>
>> **Environment**
>>
>> * VLC version: 3.0.23 Vetinari (64-bit)
>> * Operating System: Windows 11 Home
>> * GPU: NVIDIA GeForce GTX 1050 Ti (Pascal, no AV1 hardware decoding)
>> * Monitor: Standard SDR display
>>
>> **Issue**
>> When opening any AV1-encoded video, the entire video output flashes 
>> black exactly three times before playback starts.
>>
>> The flashing only occurs at the beginning of playback. After the third 
>> flash, the video plays normally without any further issues.
>>
>> **Expected behavior**
>> Playback should begin immediately without any black flashes.
>>
>> **Observed behavior**
>> The whole video output briefly turns black three times in rapid 
>> succession immediately before the first frame is displayed.
>>
>> **Additional observations**
>>
>> * The issue occurs with every AV1 file I have tested.
>> * H.264 and H.265 videos do not show this behavior.
>> * Enabling or disabling hardware-accelerated decoding makes no 
>> difference.
>> * Trying different VLC video output modules also makes no difference.
>> * The same AV1 files play normally in mpv on the same computer without 
>> any flashing.
>>
>> Because mpv does not exhibit this behavior with the same files and 
>> hardware, I suspect this may be related to VLC's AV1 playback path or 
>> video renderer initialization.
>>
>> If required, I can provide sample files or additional debug logs.
>>
>> Thank you for your work on VLC.
>>
>> -- 
>> Gruß Winfried
>>
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