#11612: Vulkan HEVC decode 1st frame broken
-------------------------------------+-------------------------------------
Reporter: Andrew-R | Type: defect
Status: new | Priority: normal
Component: avcodec | Version: git-
Keywords: vulkan, | master
hevc | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
How to reproduce:
{{{
Download
https://drive.google.com/file/d/1Ic9DZXMSo07EJMqCFaQRKSSrSw6y1mYv/view
Run ffmpeg like this:
RADV_PERFTEST=video_decode ~/bin/ffmpeg8-vk -hwaccel vulkan -i
~/K38_sdcard1/Documents/iPhone11_4K-recorder_59.940HDR10.mov -vframes 1
frame-vulkan.png
ffmpeg version N-118546-g903b085f91 Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 11.2.0 (GCC)
configuration: --enable-opencl --disable-debug --enable-libx265
--enable-libx264 --enable-gpl --enable-libplacebo --enable-vulkan
--enable-libshaderc --enable-libzimg --enable-libaom --enable-libdav1d
--enable-libsoxr --enable-libfontconfig --enable-libfreetype --enable-
libfribidi --enable-gnutls --enable-libass --enable-libbluray --enable-
libcdio --enable-frei0r --enable-libgsm --enable-openal --enable-libopus
--enable-librtmp --enable-libsnappy --enable-libspeex --enable-libssh
--enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-
libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp
libavutil 60. 3.100 / 60. 3.100
libavcodec 62. 3.101 / 62. 3.101
libavformat 62. 0.102 / 62. 0.102
libavdevice 62. 0.100 / 62. 0.100
libavfilter 11. 0.100 / 11. 0.100
libswscale 9. 0.100 / 9. 0.100
libswresample 6. 0.100 / 6. 0.100
[aist#0:1/pcm_s16le @ 0xba830c0] Guessed Channel Layout: stereo
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/guest/K38_sdcard1/Documents
/iPhone11_4K-recorder_59.940HDR10.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2020-12-18T22:20:29.000000Z
com.apple.quicktime.creationdate: 2020-12-18T17:20:29-0500
com.apple.quicktime.location.ISO6709: +33.4233-084.5802/
Duration: 00:00:19.16, start: 0.000000, bitrate: 69140 kb/s
Stream #0:0[0x1](und): Video: hevc (Main 10) (hvc1 / 0x31637668),
yuv420p10le(pc, bt2020nc/bt2020/smpte2084), 3840x2160, 64166 kb/s, 59.92
fps, 59.94 tbr, 600 tbn (default)
Metadata:
creation_time : 2020-12-18T22:20:29.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
encoder : HEVC
Stream #0:1[0x2](und): Audio: pcm_s16le (lpcm / 0x6D63706C), 48000 Hz,
stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2020-12-18T22:20:29.000000Z
handler_name : Core Media Audio
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> png (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'frame-vulkan.png':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
com.apple.quicktime.location.ISO6709: +33.4233-084.5802/
com.apple.quicktime.creationdate: 2020-12-18T17:20:29-0500
encoder : Lavf62.0.102
Stream #0:0(und): Video: png, rgb48be(pc, gbr/bt2020/smpte2084,
progressive), 3840x2160, q=2-31, 200 kb/s, 59.94 fps, 59.94 tbn (default)
Metadata:
encoder : Lavc62.3.101 png
creation_time : 2020-12-18T22:20:29.000000Z
handler_name : Core Media Video
vendor_id : [0][0][0][0]
[image2 @ 0xba825c0] The specified filename 'frame-vulkan.png' does not
contain an image sequence pattern or a pattern is invalid.
[image2 @ 0xba825c0] Use a pattern such as %03d for an image sequence or
use the -update option (with -frames:v 1 if needed) to write a single
image.
[out#0/image2 @ 0xba672c0] video:14788KiB audio:0KiB subtitle:0KiB other
streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 1 fps=0.2 q=-0.0 Lsize=N/A time=00:00:00.01 bitrate=N/A
speed=0.00299x elapsed=0:00:05.57
}}}
Observe that frame-vulkan.png broken relative to software decoding.
Problem also exist in ffmpeg 7.1.1
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11612>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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