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To play it back, you have to
- use an audio player that supports the format, e.g. foobar2000 or winamp (with plugin) or
- just drag'n'drop the compressed file again on the speex frontent - the result will be a .wav file again that can be played back with any media player :)
! BE CAREFUL - IF YOU DON'T SELECT AN OUTPUT DIRECTORY ENCODING -> DECODING WILL OVERWRITE YOUR SOURCE FILE ! So either rename the encoded file after encoding, e.g. from test.spx to test_.spx, or move the encoded files to another folder for decoding (that would happen automatically if you e-mail them to someone else ;) ).
This means the recipient of your mails must have "Speex drag'n'drop frontend" too.
Another option would be using the frontent for playback directly:
Rightclick -> Decoding options -> Check "Playback"
While we're at it...
some decoding options that might be important for you:
- Pre-Amp: You can use it to adjust the volume of the decoded file / playback volume
- Dither: It adds a small portion of noise to avoid truncation distortion. Recommendable if you choose "Unsigned 8 bit PCM" as output.
- Output Wave Format Settings:
16 bit PCM is CD resolution and recommendable quality-wise. It won't sound better with higher resolution. If you want smaller output files (1/2 size) use "Unsigned 8 bit PCM (default). Drawback: There'll be either some audible noise added (if Dither is used) or some distortion (without dither). If you run into playback problems with 8 bit try 16 bit.
Encoding options:
- Encoding quality: Lower: smaller files, Higher: better quality
- Encoding complexity: Lower: faster en/decoding Higher: better quality
- Downmix Stereo to Mono: Recommendable (If there's only one person speaking, stereo is useless and only wastes space).
- ABR: "Average Bitrate", gives you total control over bitrate -> filesize. Try it if you need to reach a certain target filesize (e.g. your email attatchments must be smaller than 2 MB)
- VBR: "Variable Bitrate" might increase quality/size ratio
- Resample Output to: If your source .wav files are sampled at other sampling rates than 8000/16000/32000 Hz, e.g.44100Hz = CD quality, check this box and choose 8, 16 or 32. Lower will cut off high frequencies but give lower filesize/better compression. The best compromise will be 16000 IMO.
Don't worry: If you don't want to mess with those options just try the default ones and only change something if you're not satisfied with the result.
This message has been edited since posting. Last time this message was edited on 15. March 2004 @ 22:48
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