HEVC_AMF 10bit support

[MihaiB.]

Hello,

Long story short - my LG EG920V (WebOS2.0) can't properly handle 2076 vertical resolution. As you can see in the attached picture half the screen is noisy with a green horizontal bar at the bottom. I tried to play the same file (.mkv) from PLEX (Xplay/Plex), EMBY(Emby Theatre/Screenplay), as well as directly from USB HDD with the same result.

[Attachment 56279 - Click to enlarge]

As an workaround I added horizontal black bars on top/bottom (42px each) with ffmpeg, but it's a very very slow process - on my AMD Ryzen 7 3700U (8 cores) it runs ~1fps. Anyway the result 3840x2160 plays without issue on TV.

Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2076 [SAR 1:1 DAR 320:173], 24 fps, 24 tbr, 1k tbn, 24 tbc (default)
ffmpeg.exe -i input.mkv -vf "pad=3840:2160ow-iw)/2oh-ih)/2" -c:v libx265 -crf 20 -map 0:0 -map 0:2 -c:a copy "output.mkv"

When I tried to use hw encoder hevc_amf I found out there is no yuv420p10le pixel format available (like libx265 has), and thus the output is only 8bit using yuv420p.

ffmpeg version 2020-12-09-git-7777e5119a-full_build-www.gyan.dev Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.0 (Rev5, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil 56. 62.100 / 56. 62.100
libavcodec 58.115.102 / 58.115.102
libavformat 58. 65.100 / 58. 65.100
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7. 92.100 / 7. 92.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Encoder hevc_amf [AMD AMF HEVC encoder]:
General capabilities: delay hardware
Threading capabilities: none
Supported hardware devices: d3d11va d3d11va dxva2 dxva2
Supported pixel formats: nv12 yuv420p d3d11 dxva2_vld

But it seems this GPU (RX VEGA 10) has hardware codec support for h265 / HEVC (10 bit) decode/encode.
https://www.cpu-monkey.com/en/cpu-amd_ryzen_7_3700u-901


The question is how can I use hevc_amf with 10bit support if possible.



Kind regards,

[ProWo]

You could also try to remux your 3840x2076 video with MkvToolNix, specifing for the videotream a resolution of 3840x2160.

[sneaker]

Try:

ffmpeg -i "input.mkv" -map 0 -c copy -bsf:v "hevc_metadata=crop_top=0:crop_bottom=0" "output.mkv"

(It's a long shot but who knows ... May need to extract and remux afterwards with mkvtoolnix.)

[MihaiB.]

Try:

ffmpeg -i "input.mkv" -map 0 -c copy -bsf:v "hevc_metadata=crop_top=0:crop_bottom=0" "output.mkv"

(It's a long shot but who knows ... May need to extract and remux afterwards with mkvtoolnix.)

This command outputs 3840x2080 which is still no good for my TV, my goal is 3840x2160. And if I don't explicitly specify the video codec it defaults to X264. Anyway after I choose libx265 it is as slow as my command above.

The real deal would be to use hardware encoding but with 10bit...

Thanks,

[MihaiB.]

You could also try to remux your 3840x2076 video with MkvToolNix, specifing for the videotream a resolution of 3840x2160.

I have already tried that and it outputs the same res 3840x2076. Where do I have to specify the resolution? If it's Video properties -> Display width/height it's not working as expected...

[ProWo]

Try

ffmpeg -i input.mkv -c copy -bsf:v "hevc_metadata=sample_aspect_ratio=16/9" output.mkv

[sneaker]

And if I don't explicitly specify the video codec it defaults to X264.

That's why I used "-c copy" ... (JFYI. Not that it solves your problem.)