I'm trying to convert a 7200x3600 60fps h265 video using my RTX 3080 to the h264 codec because of some compatibility issue with VR.
This command line result in "No NVENC capable devices found" error:
ffmpeg -hwaccel_device 0 -hwaccel cuda -i input.mp4 -c:v h264_nvenc output.mp4
However this command works (for h265):
ffmpeg -hwaccel_device 0 -hwaccel cuda -i input.mp4 -c:v hevc_nvenc output.mp4
Which for me, means that my gpu is 'NVENC capable' but I don't see what to try.
EDIT:
output of ffmpeg -f lavfi -i nullsrc -c:v h264_nvenc -gpu list -f null /dev/null:
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20200122
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
Input #0, lavfi, from 'nullsrc':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
[h264_nvenc @ 0000017e82c22540] [ GPU #0 - < NVIDIA GeForce RTX 3080 > has Compute SM 8.6 ]
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!
For H.264, nvenc has a max. resolution limit of 4096x4096. Use a software encoder like libx264. But note that a resolution of 7200x3600 is beyond the limit of any valid H.264 level so hope your target player doesn't care. Or use HEVC with different parameters.