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#1 MP4

Posted: Fri Oct 23, 2015 3:43 pm
by acorn
I have compared MP4 to wave and I must say it seems much cleaner, does MP4 use AAC or something else for the audio tracks, could some one explain why it should sound better ?

Acorn

#2 Re: MP4

Posted: Fri Oct 23, 2015 8:32 pm
by Mike H
MP4 is an encapsulation, so could almost be anything in it, but according to my VLCplayer converter profiles:


Profile: "Video - H.264 + MP3 (MP4)"

In the Edit window:
Video Codec: "H-264"
bitrate: "not used"
Quality: "not used"
Frame Rate: "same as source"

Audio Codec: "MPEG Audio"
bitrate: "128 kb/s"
Channels: "2" (stereo)
Sample Rate: "44100 Hz"

So by default it's mp3.

Looking at actual mp4 files there's slight variation in bitrate value, otherwise the same.

#3 Re: MP4

Posted: Fri Oct 23, 2015 10:09 pm
by The Stratmangler

#4 Re: MP4

Posted: Sat Oct 24, 2015 12:10 am
by Mike H
Clear as mud! :D


Whatever, it's compressed.

#5 Re: MP4

Posted: Sat Oct 24, 2015 12:49 am
by The Stratmangler
Mike H wrote:Clear as mud! :D


Whatever, it's compressed.
Sometimes losslessly - ALAC is MP4
Sometimes lossily - AAC can be MP4

#6 Re: MP4

Posted: Sat Oct 24, 2015 12:10 pm
by pre65
I always thought MP4 was for video. :?

#7 Re: MP4

Posted: Sat Oct 24, 2015 1:20 pm
by The Stratmangler
pre65 wrote:I always thought MP4 was for video. :?
It is.
It's a general format container - you can encapsulate whatever you want into it :)

#8 Re: MP4

Posted: Sat Oct 24, 2015 5:44 pm
by Mike H
So re the original question, depends what format is actually in it. Need to look at the file properties?