The mpegEncoder F.A.Q. ------------------------------------------------------------------ written and maintained by SoloH dated: 02-22-1998 -------------------------------------------------------------------------- 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 -------------------------------------------------------------------------- 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. -------------------------------------------------------------------------- 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. -------------------------------------------------------------------------- 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). -------------------------------------------------------------------------- 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. -------------------------------------------------------------------------- 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. -------------------------------------------------------------------------- Q007 There is no help, will there be one in the future? A007 Yes, but how soon...:( -------------------------------------------------------------------------- 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) -------------------------------------------------------------------------- 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. -------------------------------------------------------------------------- Q100 What is the structure of audio mpeg files? A100 You can look it up in the file "mpeg-AFS.txt" -------------------------------------------------------------------------- Q101 How can you calculate the duration of a audio mpeg file? A101 DurationInSec = (FileLength * 8) / (TotaleBitRate * 1024) --------------------------------------------------------------------------