[Cin] System ffmpeg Vulkan video transcoding fails - while benchmarking works

[Andrew Randrianasulu]

сб, 26 апр. 2025 г., 22:48 Andrea paz <gamberucci.andrea at gmail.com>:

> I re-did the test because I had not put in the environment variables.
>

RADV (AMD)  need different ones...

https://www.phoronix.com/news/RADV-Vulkan-Video-VCN4

=====
The RDNA2 support remains off by default and there is no word from AMD yet
when they may be providing updated firmware for the video events
compatibility. Otherwise the support can be enabled via the
*RADV_PERFTEST=video_decode* and *RADV_PERFTEST=video_encode* environment
variables manually.

====

but my hope was to see if libplacebo can be used with vaapi decode as noted
in ffmpeg docs:

https://ffmpeg.org/ffmpeg-filters.html#libplacebo
====
Interop with VAAPI hwdec to avoid round-tripping through RAM:

ffmpeg -init_hw_device vulkan -hwaccel vaapi -hwaccel_output_format
vaapi ... -vf libplacebo

=====

It seems to me that the result is similar:
>
> export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/radeon_icd.x86_64.json
> export ANV_VIDEO_DECODE=1
> export ANV_VIDEO_ENCODE=1
>
> ffmpeg -init_hw_device vulkan=vk:0 -filter_hw_device vk -hwaccel vaapi
> -hwaccel_output_format vaapi -i hdr_02.mp4 -vf
> libplacebo=colorspace=bt709:color_primaries=bt709:color_trc=bt709:range=tv
> -c:a copy -c:v hevc_vulkan -f avi  /dev/null
> [...]
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'hdr_02.mp4':
>  Metadata:
>    major_brand     : isom
>    minor_version   : 512
>    compatible_brands: isomiso2mp41
>    creation_time   : 2017-06-04T23:05:26.000000Z
>    encoder         : Lavf57.72.101
>  Duration: 00:02:38.56, start: 0.000000, bitrate: 60142 kb/s
>  Stream #0:0[0x1](und): Video: hevc (Main 10) (hev1 / 0x31766568),
> yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DA
> R 16:9], 60000 kb/s, 59.94 fps, 59.94 tbr, 90k tbn (default)
>      Metadata:
>        creation_time   : 2017-06-04T23:05:26.000000Z
>        handler_name    : VideoHandler
>        vendor_id       : [0][0][0][0]
>  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
> stereo, fltp, 125 kb/s (default)
>      Metadata:
>        creation_time   : 2017-06-04T23:05:26.000000Z
>        handler_name    : SoundHandler
>        vendor_id       : [0][0][0][0]
> File '/dev/null' already exists. Overwrite? [y/N] y
> Stream mapping:
>  Stream #0:0 -> #0:0 (hevc (native) -> hevc (hevc_vulkan))
>  Stream #0:1 -> #0:1 (copy)
> Press [q] to stop, [?] for help
> [AVHWFramesContext @ 0x75ca2001aac0] Unsupported pixel format: vaapi!
> [Parsed_libplacebo_0 @ 0x75ca20004600] Failed to configure output pad
> on Parsed_libplacebo_0
> [vf#0:0 @ 0x5b20b569c5c0] Error reinitializing filters!
> [vf#0:0 @ 0x5b20b569c5c0] Task finished with error code: -22 (Invalid
> argument)
> [vf#0:0 @ 0x5b20b569c5c0] Terminating thread with return code -22
> (Invalid argument)
> [vost#0:0/hevc_vulkan @ 0x5b20b56c5580] Could not open encoder before EOF
> [vost#0:0/hevc_vulkan @ 0x5b20b56c5580] Task finished with error code:
> -22 (Invalid argument)
> [vost#0:0/hevc_vulkan @ 0x5b20b56c5580] Terminating thread with return
> code -22 (Invalid argument)
> [out#0/avi @ 0x5b20b55c3c80] Nothing was written into output file,
> because at least one of its streams received no packets.
> frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A
> Conversion failed!
>
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