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- The mpegEncoder F.A.Q.
-
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- written and maintained by SoloH
- dated: 02-22-1998
-
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- Q001 I've just tried to convert a .wav to an .mp3. The resulting file
- plays really fast......like its on mega-fast forward!
- What am I doing wrong??
-
- A001 Your wave-file isn't recorded with the correct sample rate.
- For layer 1, 2 and 3 you can encode wave-file with sample rates of:
- 38000 Hz, 44100 Hz or 48000 Hz.
- For layer 1 and 2 you can also use 16000 Hz, 22050 Hz or 24000 Hz.
- You can view the sample rate of a wave-file by using explorer and
- right-clicking on the wave-file and choosing the properties
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- Q002 Why does encoding of a .cda file (cdrom) not work?
-
- A002 This .cda file is some sort of windows shortcut to show audiotrax.
- The .cda file is very short and contains no wave-data.
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- Q003 According to notes on your website, v0.06 should encode directly
- from cd...but when I attempt this, I get the message that
- 'Encoding from cd is not supported'.......
-
- A003 v0.06
- You'll have to select a scsi cdrom device in the source
- drive combo. Don't select the drive letter, but the ha:id:lun.
- You'll see a track-list displayed. If you have a mp3 codec (like
- opticom's mp3 producer) you can select one or more tracks and
- press the left-pane top-most button to encode. This is just a
- test version, that's why the encode button is on a different
- place.
- Options, like bitrate, don't work when using the codec. It will
- use the best settings the codec supports.
- If you don't see scsi addresses in the source drive combobox,
- then your cdrom isn't supported with my encoder.
- If you don't have a codec than no cd-trax will be encoded.
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- Q004 When trying to encode from a cd.. nothing happens..
-
- A004-1 You're probably trying to encode the *.cda files which are only
- windows shortcuts to audio trax. It's not a wave-file.
-
- A004-2 v0.06: You either don't have a scsi cdrom or don't have a
- mp3-codec (or both).
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- Q005 I saw something about codec support, but I couldn't seem to get it
- to work.
-
- A005 v0.06 shows an option to select codec support, but this is not
- functionally. It will be removed in newer versions, because I'm
- going to build a seperate encoder with only codec support. Some
- sort of front-end.
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- Q006 v0.06 will not rip any CD-DA tracks beyond track 09.
-
- A006 There is a bug, so you can't encode CD-DA track 10, but you can
- do a second run in which you can select CD-DA tracks > 10.
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- Q007 There is no help, will there be one in the future?
-
- A007 Yes, but how soon...:(
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- Q008 I just realised that your app does MPEG-II, not MPEG-I.
-
- A008 Wrong. The mpegEncoder does encode MPEG-I and MPEG-II, but doesn't
- support layer-3 with MPEG-II. (see Q009)
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- Q009 What's the main difference between MPEG-I and MPEG-II?
-
- A009 Standard sample rates for MPEG-I are 38000, 44100 and 48000 Hz.
- MPEG-II is designed for lower sample rates, which are 16000, 22000
- and 24000 Hz.
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- Q100 What is the structure of audio mpeg files?
-
- A100 You can look it up in the file "mpeg-AFS.txt"
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- Q101 How can you calculate the duration of a audio mpeg file?
-
- A101 DurationInSec = (FileLength * 8) / (TotaleBitRate * 1024)
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