MKV to MP4

[tex4ever]

Hi guys,

I converted some files from MKV to MP4. I noticed with mediainfo, that the MKV files had 5957 kbps. The MP4 files have 7360 kbps.
Does the higher bitrate decrease the quality? Or does it just increase the file-size?

Thanks for your help!

Tex

[Baldrick]

It increases the size. Reconversion decreases the quality but higher bitrates = less quality loss.

BUt how did you convert?

You can use mkv to mp4-remuxers that doesn't reconvert and change the bitrate like mkvtomp4, rebox.net, etc.

[tex4ever]

Ah ok thx for your fast reply! Well I do it with Audials 9. I think the results are ok, what do you think about this product?

And are the default settings of mkvtomp4 good enough for Apple TV? I ask because when I go to the audio settings, the defaults are AAC 2.0 Quality 0,55. Why 0,55 and not 1,0?

[Baldrick]

I guess the default settings should. Try it!

And I haven't tried audials. I just use handbrake or vidcoder for mp4 video conversions.

[hello_hello]

And are the default settings of mkvtomp4 good enough for Apple TV? I ask because when I go to the audio settings, the defaults are AAC 2.0 Quality 0,55. Why 0,55 and not 1,0?

In the case of AAC most programs default to Q0.50, which is supposed to be where AAC is "transparent". Why your program defaults to Q0.55 I'm not sure as I've never used it. Personally I just encode everything using Q0.50

As suggested it might pay to try using a tool to extract the existing audio/video from the MKV and save it as an MP4. No re-encoding required so no quality loss. Whether it'll work depends on whether the MKV contains audio/video the MP4 container supports (h264 and AAC is fine). Whether it'll play on a particular device depends on the settings used when originally encoding the video (MKV) and what your player supports. YAMB is another tool which will open MKVs and save them as MP4s.