You can re-encode the selected video with your preferred codec.
If you want to reduce the video file size even if it means lowering the video quality, please use this.
The process is completed within the device.
You can convert the video to the following codecs and containers by re-encoding.
・AVC (H.264) / AAC / MP4
・HEVC (H.265) / AAC / MP4
・AV1 / AAC / MP4
・VP9 / Opus / WebM
・AV1 / Opus / WebM
It can also process 10-bit HDR video, but in a limited way.
This app is open source.
https://github.com/takusan23/HimariDroid