MP4

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acorn
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MP4

Post by acorn » Fri Oct 23, 2015 3:43 pm

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

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Mike H
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Re: MP4

Post by Mike H » Fri Oct 23, 2015 8:32 pm

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.
 
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The Stratmangler
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Re: MP4

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

Chris :happy3:

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Mike H
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Re: MP4

Post by Mike H » Sat Oct 24, 2015 12:10 am

Clear as mud! :D


Whatever, it's compressed.
 
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The Stratmangler
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Re: MP4

Post by The Stratmangler » Sat Oct 24, 2015 12:49 am

Mike H wrote:Clear as mud! :D


Whatever, it's compressed.
Sometimes losslessly - ALAC is MP4
Sometimes lossily - AAC can be MP4
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pre65
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Re: MP4

Post by pre65 » Sat Oct 24, 2015 12:10 pm

I always thought MP4 was for video. :?
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The Stratmangler
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Re: MP4

Post by The Stratmangler » Sat Oct 24, 2015 1:20 pm

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 :)
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Mike H
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Re: MP4

Post by Mike H » Sat Oct 24, 2015 5:44 pm

So re the original question, depends what format is actually in it. Need to look at the file properties?
 
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