@petae There's only one single software that transcodes media files, it's called ffmpeg and any software you could think of use it, so instead of downloading a fancy paid software you could just use ffmpeg directly, since it's free.

You can find a very cool version here, with a friendly interface that is easy to use:

https://github.com/MattMcManis/Axiom/releases/tag/v1.9.6.1-alpha

Just download " Axiom.FFmpeg.7z" and extract it anywhere you want, then open axiom.exe.

If you want to process more than one file at once, click the "batch" button in the bottom right, and then click the "input" button to select the folder where your videos are located. Then select an output where you want the transcoded files to be stored.

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On the right side you'll see a few tabs, the default tab is "formats" where you'll essentially pick your desired extension in the "container" option. I'd recommend MKV or MP4.

If you pick MP4, you can choose between H264 or H265 (also known as HEVC).

If you pick MKV you'll have a few more options such as VP9 and AV1, but bear in mind that AV1, although very efficient, requires a 40-series Nvidia card.

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After picking your container, go to the "video" tab.

First, change the HW Accel option to "On" and then set the "Decode" option to auto. This way you'll have more encoding formats available.

For video Codec you can pick either H264 NVENC or HEVC NVENC if you have an Nvidia GPU. If you use AMD, pick the AMF option.

(If you don't have a compatible GPU or if you're unsure, just pick regular x264 or x265, but expect it to be very very slow.)

H265 HEVC takes a little more time to encode, but the output file will save 30% more storage while maintaining the same picture quality.

Prefer HEVC if you have a modern GPU. Leave "Encode Speed" on DEFAULT regardless of which encoder you chose.

As for the "Quality" option:
If you're using H264 encoder (x264 or NVENC) Set the "Quality" option, pick LOW.

If you chose H265 (x265 or NVENC) you could try either SLOW or MEDIUM and see what's best for you in terms of storage efficiency.

Additionally, if you want to change the resolution of your videos, you can go to the "Size" tab and pick one of the presets.

Disclaimer: the settings I am recommending here are exclusive for videos from OF or JFF, since they have a default bitrate. This will give you a result that's smaller in size without sacrificing too much on picture quality.