FileFlows VS jmkvpropedit

https://fileflows.com a web based media converter app is built with Blazor.

FileFlows all the way: https://fileflows.com/

Official site GitHub repo

Can I suggest https://fileflows.com/ as an addition tot he list as an alternative to TDARR

Since you're talking about lots of files to process, I can recommend 2 other apps you might find handy: ShutterEncoder Shutter Encoder and FileFlows

You might want to check outFileFlows. It allows you to set your own parameters for automated file processing, including recoding audio & video, using a simple, flow-chart/process flow type gui.

Handbrake was my go-to for years, but for the last 6 months or so I've used Shutter Encoder and FileFlows (both are free) for my encodes.

Fileflows

I'm currently testing out FileFlows to automate converting AVC videos to HEVC using NVENC.

I use Fileflows for such things - https://fileflows.com

I think they will only be enabled automatically if the subtitle track you want has the “Forced” flag on it within your video file. You can use MKVToolnix to do this on individual files or you can use jmkvpropedit to batch edit files.

I forgot to mention there’s also JMkvpropedit which makes it easier to batch edit. I’ve used it for anime before and it works great.

jmkvpropedit is a lovely tool that i've been using for years to do this.

JMkvpropedit

If you're ripping it yourself then your software seems to create bad metadata for your audio. You can try batch editing the audio tracks using JMKVproperedit

mkvpropedit can do this, although the command-line options aren't as convenient as mkvmerge, so I'd recommend JMkvpropedit (a GUI built on top of mkvpropedit). Should just be a case of dragging/dropping your files in then adjusting the options.