https://www.videezy.com/free-video/prores-4444 well, some 10 sec video can weight 547 Mb! Now, trying THIS instead of just 422 I see "device lost" on my end too! ./ffmpeg -init_hw_device vulkan=vulkan -hwaccel vulkan -filter_hw_device vulkan -hwaccel_output_format vulkan -i ~/200818_LoopAlphaThankYouGoldText.mov -c:v prores_ks_vulkan -f matroska 4k.mov ffmpeg version N-120782-gc12bca52f8 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. 19.101 / 60. 19.101 libavcodec 62. 21.100 / 62. 21.100 libavformat 62. 6.103 / 62. 6.103 libavdevice 62. 2.100 / 62. 2.100 libavfilter 11. 10.101 / 11. 10.101 libswscale 9. 3.100 / 9. 3.100 libswresample 6. 2.100 / 6. 2.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/guest/200818_LoopAlphaThankYouGoldText.mov': Metadata: major_brand : qt minor_version : 537199360 compatible_brands: qt creation_time : 2020-08-24T17:07:38.000000Z Duration: 00:00:10.00, start: 0.000000, bitrate: 459164 kb/s Stream #0:0[0x1](eng): Video: prores (4444) (ap4h / 0x68347061), yuva444p12le(tv, bt709, progressive), 3840x2160, 458325 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 30 tbn (default) Metadata: creation_time : 2020-08-24T17:07:38.000000Z handler_name : Apple Video Media Handler vendor_id : appl encoder : Apple ProRes 4444 timecode : 00:00:00:00 Stream #0:1[0x2](eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default) Metadata: creation_time : 2020-08-24T17:07:38.000000Z handler_name : Time Code Media Handler timecode : 00:00:00:00 File '4k.mov' already exists. Overwrite? [y/N] y Stream mapping: Stream #0:0 -> #0:0 (prores (native) -> prores (prores_ks_vulkan)) Press [q] to stop, [?] for help [prores_ks_vulkan @ 0xbd54600] Autoselected 4:4:4:4 profile because of the used input colorspace. It can be overridden through -profile option. Output #0, matroska, to '4k.mov': Metadata: major_brand : qt minor_version : 537199360 compatible_brands: qt encoder : Lavf62.6.103 Stream #0:0(eng): Video: prores (4444) (ap4h / 0x68347061), vulkan(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 1k tbn (default) Metadata: encoder : Lavc62.21.100 prores_ks_vulkan creation_time : 2020-08-24T17:07:38.000000Z handler_name : Apple Video Media Handler vendor_id : appl timecode : 00:00:00:00 radv/amdgpu: The CS has been cancelled because the context is lost. This context is guilty of a soft recovery. [prores_ks_vulkan @ 0xbd54600] [vk @ 0xbd6d240] Unable to submit command buffer: VK_ERROR_DEVICE_LOST [vost#0:0/prores_ks_vulkan @ 0xbd65bc0] [enc:prores_ks_vulkan @ 0xbd54580] Error submitting video frame to the encoder [vost#0:0/prores_ks_vulkan @ 0xbd65bc0] [enc:prores_ks_vulkan @ 0xbd54580] Error encoding a frame: Generic error in an external library [vost#0:0/prores_ks_vulkan @ 0xbd65bc0] Task finished with error code: -542398533 (Generic error in an external library) [vost#0:0/prores_ks_vulkan @ 0xbd65bc0] Terminating thread with return code -542398533 (Generic error in an external library) [prores @ 0xbd57700] [vk @ 0xe4600dc0] Unable to submit command buffer: VK_ERROR_DEVICE_LOST [out#0/matroska @ 0xbd63e40] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown [out#0/matroska @ 0xbd63e40] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used) frame= 0 fps=0.0 q=0.0 Lsize= 1KiB time=N/A bitrate=N/A speed=N/A elapsed=0:01:01.94 Conversion failed! I have 4 Gb vram, but 32-bit system. Testing just decoding with ./ffmpeg -init_hw_device vulkan=vulkan -hwaccel none -filter_hw_device vulkan -hwaccel_output_format vulkan -i ~/200818_LoopAlphaThankYouGoldText.mov -f null /dev/null -benchmark gives me frame= 300 fps= 15 q=-0.0 Lsize=N/A time=00:00:10.00 bitrate=N/A speed=0.502x elapsed=0:00:19.91 bench: utime=72.167s stime=0.745s rtime=19.911s bench: maxrss=693980KiB ./ffmpeg -init_hw_device vulkan=vulkan -hwaccel vulkan -filter_hw_device vulkan -hwaccel_output_format vulkan -i ~/200818_LoopAlphaThankYouGoldText.mov -f null /dev/null -benchmark frame= 300 fps= 69 q=-0.0 Lsize=N/A time=00:00:10.00 bitrate=N/A speed=2.31x elapsed=0:00:04.32 bench: utime=0.771s stime=1.278s rtime=4.327s bench: maxrss=146296KiB So it works .... I think? At least when using ffmpeg from git ...