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H.264 params
CRF (Constant Rate Factor), 0..51 (0-lossless) 17..23 very good, no blocking efect furing fast movement 23 - default
Change container
ffmpeg -i input.ts -vcodec copy -sameq -acodec copy -f matroska output.ts
Examples
Recompress
ffmpeg -i input.mp4 -b 1000000 output.mp4 ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4
ffmpeg -i input.mp4 -c:v libx264 -crf 23 output.mp4 ffmpeg -i input.ts -c:a copy -c:v libx264 -crf 18 -preset veryfast NL.mp4
vidia
https://www.maketecheasier.com/convert-video-to-mp4-handbrake-linux/