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

[Andrew Randrianasulu]

сб, 26 апр. 2025 г., 22:58 Andrew Randrianasulu <randrianasulu at gmail.com>:

>
>
> 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
>
> =====
>

Decode seems to work, and together with libplacebo's tonemap and pulling
frames back to sysmem I got 15 fps at full 4k!

RADV_PERFTEST=video_decode,video_encode time -p ./ffmpeg  -init_hw_device
vulkan=vulkan -filter_hw_device vulkan   -hwaccel vulkan  -i
~/K38_sdcard1/Documents/iPhone11_4K-recorder_59.940HDR10.mov -vf
libplacebo=colorspace=bt709:color_primaries=bt709:color_trc=bt709:range=tv
-c:a copy -c:v rawvideo -f nut -benchmark /dev/null

frame= 1148 fps= 15 q=-0.0 Lsize=27900063KiB time=00:00:19.16
bitrate=11927607.4kbits/s speed=0.246x

bench: utime=36.673s stime=64.718s rtime=77.794s

bench: maxrss=703552KiB

real 79.39

user 36.77

sys 64.78





> 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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