Soft subs are discarded on copy, but when encoding they remain (to mp4)

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open a file any mkv (it seems)
2. Select the Format for mp4
3. Go to video encoding and select copy
4. In the preview window the preview works exactly the way I want it too
5. When the file is done copying the soft subtitles are gone, and only the 
hardcoded files are added.

What is the expected output? What do you see instead?
I want xvid4psp to encode the soft subtitles with an MKV (usually anime) to an 
mp4 with subtitles so I can use it on my diskstation.

What version of the product are you using? On what operating system?
Current - 5.10.346.0

Please provide any additional information below.
The copy method is SO much faster and produces good quality with a smaller file 
size. I batch encode hundreds at a time so I really want this to work. Just so 
you know if I encode the file the soft subs are added.

Original issue reported on code.google.com by uomarkym...@gmail.com on 28 Apr 2015 at 3:48

[GoogleCodeExporter]

I have CCCP installed, and I've played around with the codecs to see if this 
corrected the issue, but it doesn't seem to be an issue with codecs as it's 
loading the matroska codec when the file is loaded in xvid.

Original comment by uomarkym...@gmail.com on 28 Apr 2015 at 3:51

[GoogleCodeExporter]

what's the point of changing the container if you're not encoding the video?
if you want to make it mp4 container and ignore what's inside just change the 
filename from .mkv to .mp4 if that's make you happy. in xvid4psp when you 
encode you're actually burning the subtitles into the video 

Cheers

Original comment by Ashur.Ir...@gmail.com on 17 May 2015 at 1:27

[GoogleCodeExporter]

Yeah... I don't understand what you're really trying to accomplish here

you say that the "copy" method produces good quality... well of course it does 
since its not actually changing anything.

MP4s can have soft subtitle tracks but there isn't any point to using the mp4 
container over mkv if you aren't hardcoding the subtitles.

Original comment by b...@live.com on 21 May 2015 at 8:17