Massive framedrops in mpv 0.36.0 compiled with rpi-ffmpeg 6.0 with 4k 60 Hz HEVC HDR 10bit videofiles

Important Information

Provide following Information:

• mpv version: 0.36.0
• Linux Distribution and Version: Debian GNU/Linux 12 (bookworm) in a form of Raspberry OS 64bit
• Source of the mpv binary: compiled from https://github.com/mpv-player/mpv
• GPU driver and version: Raspberry Pi 4 V3D driver

Sample files

Get the test video file first:
$ yt-dlp -f dash-google_mediacdn-video-f4765daf https://vimeo.com/712764913
$ du -hs Samsung-and-RedBull-See-the-Unexpected-HDR-UHD-4K-(www.demolandia.net\).ts\ [712764913].mp4
350M Samsung-and-RedBull-See-the-Unexpected-HDR-UHD-4K-(www.demolandia.net).ts [712764913].mp4

Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : SMPTE ST 2086, HDR10 compatible
Codec ID                                 : hvc1
Codec ID/Info                            : High Efficiency Video Coding
Duration                                 : 3 min 17 s
Bit rate                                 : 14.6 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 59.940 (60000/1001) FPS

Reproduction steps

I use specific ffmpeg libs-> /usr/lib/rpi-ffmpeg-6/lib, libplacebo lives in /usr/local/lib/aarch64-linux-gnu.

Playing the HEVC videofile 4k 60 Hz so

#!/bin/bash

LD_LIBRARY_PATH=/usr/lib/rpi-ffmpeg-6/lib:/usr/local/lib/aarch64-linux-gnu mpv --no-config --vo=gpu --gpu-context=drm --hwdec=drm \
                                        --drm-draw-plane=overlay --drm-drmprime-video-plane=primary --drm-draw-surface-size=1920x1080 \
                                        Samsung-and-RedBull-See-the-Unexpected-HDR-UHD-4K-\(www.demolandia.net\).ts\ \[712764913\].mp4 

Output:

AO: [pulse] 48000Hz stereo 2ch float
VO: [gpu] 3840x2160 drm_prime[rpi4_10]
AV: 00:00:02 / 00:03:17 (1%) A-V:  0.032 Dropped: 128

There are framedrops even massive framedrops in several seconds of playing.

And HEVC 1080p in action. 0 framedrops:

$ LD_LIBRARY_PATH=/usr/lib/rpi-ffmpeg-6/lib:/usr/local/lib/aarch64-linux-gnu mpv --no-config --vo=gpu --gpu-context=drm --hwdec=drm                                         --drm-draw-plane=overlay --drm-drmprime-video-plane=primary --drm-draw-surface-size=1920x1080                                         Ahsoka.S01E01.1080p.HEVC.x265-MeGusta\[eztv.re\].mkv
AO: [pulse] 48000Hz 5.1(side) 6ch float
VO: [gpu] 1920x1080 drm_prime[rpi4_10]
AV: 00:00:14 / 00:54:43 (0%) A-V:  0.000

I ask because these are played smoothly with no dramedrops but without sound as well, also vlc plays also without framedrops and A/V desynchronization.

And LibreElec supports for playing HEVC 4k 60 Hz somehow, i tried almost the same config but no luck.

$ LD_LIBRARY_PATH=/usr/lib/rpi-ffmpeg-6/lib /usr/lib/rpi-ffmpeg-6/bin/ffmpeg  -no_cvt_hw -hwaccel drm -vcodec hevc -i Samsung-and-RedBull-See-the-Unexpected-HDR-UHD-4K-\(www.demolandia.net\).ts -f vout_drm /dev/null

$ LD_LIBRARY_PATH=/usr/lib/rpi-ffmpeg-6/lib ./hello_drmprime Samsung-and-RedBull-See-the-Unexpected-HDR-UHD-4K-\(www.demolandia.net\).ts

No connector ID specified.  Choosing default from list:
Connector 32 (crtc 96): type 11, 1920x1080 (chosen)
Connector 42 (crtc 0): type 11, 0x0
[hevc @ 0x5577979a40] Hwaccel V4L2 HEVC stateless V4; devices: /dev/media1,/dev/video19; buffers: src DMABuf, dst DMABuf; swfmt=rpi4_10

Expected behavior

Video plays smoothly

Actual behavior

Massive framedrops

Why not mpv 0.37?

Because these lines are in mpv log

[hwupload] Unable to find a compatible upload format for rpi4_10
[autoconvert] Failed to create HW uploader for format rpi4_10

mpv 0.37 and mpv-git still have some issues when working with rpi-ffmpeg

Start by reproducing the 4K 60 Hz HEVC HDR case with the provided mpv command and compare it with the working 1080p case. Review the DRM hardware-decoding path around the rpi4_10 format and the reported hwupload/autoconvert messages, then verify the result by confirming smooth playback without the reported frame drops.