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