[ffmpeg] av_log callback called with bad parameters (NULL AVClass).

[mibby]

One of the ffmpeg libraries errors when used with hwdec d3d12va-copy? Does not happen with d3d11va-copy or nvdec-copy. d3d12va-copy does correctly show up being used in the Shift + i HW: output and the video plays fine.

gpu-api=d3d11
gpu-context=d3d11
hwdec=d3d12va-copy
vo=gpu-next
profile=high-quality

mpv v0.39.0-430-ga283f66e Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
 built on Nov 30 2024 00:11:36
libplacebo version: v7.350.0 (v7.349.0-29-g5ba1376-dirty)
FFmpeg version: N-117959-g4100a2da2
FFmpeg library versions:
   libavcodec      61.26.100
   libavdevice     61.4.100
   libavfilter     10.6.101
   libavformat     61.9.100
   libavutil       59.47.101
   libswresample   5.4.100
   libswscale      8.12.100

C:\Users\Admin> mpv "D:\File.mkv"
● Video  --vid=1  --vlang=ja  (hevc 1920x1080 23.976 fps) [default]
● Audio  --aid=1  --alang=ja  'Japanese (FLAC 2.0)' (flac 2ch 48000 Hz) [default]
● Subs   --sid=1  --slang=en  'English' (ass) [default]
File tags:
 Title: File
[ffmpeg] av_log callback called with bad parameters (NULL AVClass).
[ffmpeg] This is a bug in one of FFmpeg libraries used.
Using hardware decoding (d3d12va-copy).
AO: [wasapi] 48000Hz stereo 2ch float
VO: [gpu-next] 1920x1080 p010
(Paused) AV: 00:00:00 / 00:23:36 (0%) A-V:  0.010 DS: 2.625/0 Dropped: 1
Exiting... (Quit)

Is there any way to figure out which library is causing the warning so it can possibly be fixed or forwarded upstream?

[llyyr]

Warning is caused by incorrect av_log usage by the d3d12 context code in ffmpeg

diff --git a/libavutil/hwcontext_d3d12va.c b/libavutil/hwcontext_d3d12va.c
index 6507cf69c15e..339572679001 100644
--- a/libavutil/hwcontext_d3d12va.c
+++ b/libavutil/hwcontext_d3d12va.c
@@ -660,7 +660,7 @@ static int d3d12va_device_create(AVHWDeviceContext *hwdev, const char *device,
             DXGI_ADAPTER_DESC desc;
             hr = IDXGIAdapter2_GetDesc(pAdapter, &desc);
             if (!FAILED(hr)) {
-                av_log(ctx, AV_LOG_INFO, "Using device %04x:%04x (%ls).\n",
+                av_log(hwdev, AV_LOG_INFO, "Using device %04x:%04x (%ls).\n",
                        desc.VendorId, desc.DeviceId, desc.Description);
             }
         }
@@ -668,7 +668,7 @@ static int d3d12va_device_create(AVHWDeviceContext *hwdev, const char *device,
         hr = priv->create_device((IUnknown *)pAdapter, D3D_FEATURE_LEVEL_12_0, &IID_ID3D12Device, (void **)&ctx->device);
         D3D12_OBJECT_RELEASE(pAdapter);
         if (FAILED(hr)) {
-            av_log(ctx, AV_LOG_ERROR, "Failed to create Direct 3D 12 device (%lx)\n", (long)hr);
+            av_log(hwdev, AV_LOG_ERROR, "Failed to create Direct 3D 12 device (%lx)\n", (long)hr);
             return AVERROR_UNKNOWN;
         }
     }

This might fix it but I don't use Windows so can't test