Windows .MTS to .MP4 (or MKV) convertor

prime

prime

Level H
Hi.

I have many 1080p .MTS video files which HUUUGGEE is size.

I remember converting 1-2 files a couple of years ago to mp4 and the size reduced significantly. I don't remember which software I used back then.

The softwares I tried give so many option to change quality instead of a single option "Keep original quality".

Please suggest me a software (windows 10/11) that converts MTS files to MP4 (HEVC / H.265) without loosing quality which is easy to use.
 
StygianClaw said:
HandBrake
Click to expand...
Thanks.

Please suggest where is the option to select "keep original quality of audio and video". If it is not there, please suggest what option should I select to keep best possible results.

I tried with default option and an option with some changes (see screenshots).
 

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prime said:
Please suggest where is the option to select "keep original quality of audio and video".
Click to expand...
You cannot keep original video audio quality without simply copying audio & video stream to a new container (in this case that would be copying video & audio stream as such to .mp4 but that would not reduce the size). Just experiment with default settings & keep in mind that support for h264 video is more than h265 especially among older devices (phone, TV etc).
 
Vidcoder is another software which can be used.

Ensure that you are using QSV encoding to speed up the process if using a supported Intel processor.

Play with the different codecs, resolutions and bit rates to achieve what you get.
 
MTS is AVHCD which uses H.264 for video compression. If you copy original video quality to a mkv or mp4 wrapper using H.264 encoding only, size won't decrease by much.
That said, Avidemux has the option to copy video and audio streams and only change the wrapper.
 
prime said:
Hi.

I have many 1080p .MTS video files which HUUUGGEE is size.

I remember converting 1-2 files a couple of years ago to mp4 and the size reduced significantly. I don't remember which software I used back then.
Click to expand...
you were encoding them, changing containers wont affect size at all
prime said:
The softwares I tried give so many option to change quality instead of a single option "Keep original quality".
Click to expand...
There is none, all you can do is figure out the settings which would give you the closest quality to original also called transparent encodes.
prime said:
Please suggest me a software (windows 10/11) that converts MTS files to MP4 (HEVC / H.265) without loosing quality which is easy to use.
Click to expand...
like other peeps suggested, handbrake is definitely the easiest and the least pain in the ass for you. for a quick encode (mind you its not the best way), you can look into CRF (constant rate factor) encoding, I'm not gonna get into it too much but the gist is, its a way to set a particular value called crf value and handbrake will try to encode your video to that particular matching preset value, the lower the value the better the quality and the increase in size and conversely, higher the value, lower will be the size and quality, you can play around with it but I would recommend you sticking to anywhere from CRF 15-17 to at max 21-23.
Its been years since I used handbrake but it definitely has this option, I wont suggest converting to HEVC unless you have a beefy CPU (GPU encoding is just trash), or are fine with running your PC for a long time.
 
prime said:
Please suggest where is the option to select "keep original quality of audio and video". If it is not there, please suggest what option should I select to keep best possible results.
Click to expand...
You can't compress a video without throwing away data. Every time you re-encode a video, it loses some data - whether it is noticeable or not, that depends on a lot of things
For original quality, keep the current file you have and invest in a big HDD

To re-encode with minimal loss in quality choose:
  • Keep resolution and frame rate same as source
  • Encode speed as low as you can tolerate
  • Constant quality factor - choose higher quality, but it results in larger file size
  • 10-bit colour
  • More efficient codec. Newer codec can have better quality for a given file size/bitrate
  • Hardware encoding can be fast, but for better quality use Software encoding
Use this as a starting point: x265 10-bit, CQ=18, Speed = slow
Try changing the settings and see which you prefer
 
prime said:
Thanks.

Please suggest where is the option to select "keep original quality of audio and video". If it is not there, please suggest what option should I select to keep best possible results.

I tried with default option and an option with some changes (see screenshots).
Click to expand...
What I used to do way back:
Take a video file that has lot of action scenes or flashing lights - basically where there is a large change in pixels with each passing frame.
Fix a CRF value on handbrake (used to begin with 21 or 23), CRF works like variable bit rate hence boosts the bit rate for scenes that require heavy encoding, and vice versa.
IF the results were satisfactory, then use it for all files, otherwise increase or decrease.

There is no point in lossless archival quality unless you plan to zoom it up on a 4K 20 feet display and do pixel peeping from close distance.
The less I talk about audio, the better.
 
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