I have a file of resolution 3840x1632, but my TV stretches the picture vertically to fill up all 2160 pixels of height. Is it possible to use ffmpeg to add blank / black height, while preserving the video and audio quality?
Tried doing this, which seemed to work (took about 2 hours, the same length of the video), but greatly reduced the file size/video quality):
ffmpeg -i input.mkv -filter:v "pad=3840:2160:0:280" -c:a copy my_output_video.mkv
Is there a switch to say "keep everything else the same"?