Just to see if there is any difference using HandBrake CLI, I ran this:Īt first with distro-provided FFmpeg v3, I was able to use hevc_nvenc to perform the encoding, but after I installed the snap’s version (with -edge flag) to get the latest FFmpeg v4, I was not able to perform encoding anymore.Īt first, the error was that it could not find the libcuda.so.1, which was remedied by installation nvidia-cuda-toolkit from official repo. HandBrake GUI ran for 17 mins 45 secs with the output size of 245 MB ( 48.6% smaller). The output excludes subtitle, but that would be less than 1 MB anyway (this is an assumption, not a fact, since subtitle files are not that big).

The container output format really probably does not matter, but the framerate would be a factor. On HandBrake, all using default parameters, except setting the output framerate to 24 (default: 30) and container output format as Matroska. Interestingly, the audio codec was transcoded from MPEG-AAC to Vorbis based on the stream description provided by VLC, even though I did not specifically ask FFmpeg to perform audio transcoding.

I checked the video, it ran fine with subtitle stream retained.

Ffmpeg transcode to h265