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| malky |
| Posted: Nov 27 2011, 11:51 AM |
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What's the difference (except for the file extension) between:
File > Save Wav.
and
File > Export > Raw audio.
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| dloneranger |
| Posted: Nov 27 2011, 12:43 PM |
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Wav is a file format, with headers etc about whats in the file itself (Hz, channels etc) and it's usually saved as uncompressed pcm (that is, users, normally save wavs in uncompressed pcm format)
Raw audio is just a straight dump of whatever the audio stream is
If the video already had mp3 audio in it and the audio processing mode was full processing
save as wav would give a valid wav file in whatever format selected in the processing mode
export raw audio would just be the raw audio in whatever format selected in the processing mode
If the video already had mp3 audio in it and the audio processing mode was direct stream copy
save as wav would give a valid wav file with an mp3 in it (this file may be unusable depending on the importing program)
export raw audio would just be the raw mp3 file
etc
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| ale5000 |
| Posted: Nov 27 2011, 03:39 PM |
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@dloneranger: If the audio is mp3, "save as wav" add wav headers to mp3 audio.
To get uncompressed PCM audio you must select Audio => Full processing mode before "save as wav".
Yes - that's why I said 'its usually saved as pcm'
I meant, that people usually save wavs as uncompressed pcm
It didn't really read that way, so I've edited the post for accuracy and readability (I hope)
If it still sounds off, let me know and I'll have a go at re-editing
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| malky |
| Posted: Nov 28 2011, 01:22 AM |
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Yet the raw mp3 file from VirtualDub does contain information (according to mediaInfo).
So in what sense is it 'raw'.
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| dloneranger |
| Posted: Nov 28 2011, 07:28 AM |
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Raw, as in, no extra bits added or taken away
Yes - that's right, thats an mp3 file, so it has the mp3 information
the save raw file saved the audio stream directly out of the file
it doesnt have the wav header around it that save as wav would have done
if it was pcm audio, it would look like gibberish, if it was an ac3 file it would have ac3 information etc
If you do the same with save as wav, you'll have a wav file with an mp3 in it
Mp3's have their information in them already, but if you'd chosen to convert the audio to pcm uncompressed, then you'd have a gibberish looking file, as it would be the raw pcm bytes, and pcm doesn't have any information about it actually in it (channels, duration, frequency etc),
So for pcm, you'd normally save as wav, to put the wav header on it, which would have the frrequency, duration etc in it
raw audio - the audio stream extracted from the avi (depending of the format, it may or may not have useful information)
save as wav - the same thing wrapped in a wav container http://en.wikipedia.org/wiki/WAV
here's an idea
you know what a .zip file is yeah?
well... save as wav is like that, the wav information is wrapped around the audio stream
and raw audio - is the audio stream
I might give up trying to explain this any further, as I'm obviously doing a bad job 
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MultiAdjust JoinWav WavNormalize FFMPeg Input Plugin v1827 UnSharpMask
Windows7/8 Codec Chooser
All FccHandlers Stuff inc. Installers for acm codecs AAC, AC3, LameMp3 |
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| malky |
| Posted: Nov 28 2011, 10:35 AM |
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| QUOTE | | Mp3's have their information in them already, but if you'd chosen to convert the audio to pcm uncompressed, then you'd have a gibberish looking file, as it would be the raw pcm bytes, and pcm doesn't have any information about it actually in it (channels, duration, frequency etc), |
So I did that and opened it in Audacity and it was a collection of squeaks.
I like the cut of your gibberish - thanks for the assist. |
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| ale5000 |
| Posted: Nov 28 2011, 01:12 PM |
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To be sure to have a file that work everywhere select "Audio => Full processing mode" and then "File > Save Wav".
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