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I decided to make a short guide to checking the bitrates of songs.
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This is a relatively simple process, and only takes about a minute. If you want to check the actual bitrate of any song, it starts by downloading a program called spek. It's a free, user friendly spectogram software that is incredibly easy to use. Download it, and open it up. If you did that right, you'll see this on your screen. Click on the folder in the top left, and locate your song. I'll use a song from an album I bought and put on my computer at 320 kbps.
IMPORTANT
This is where you check the actual bitrate of your file. The reference I use is this:
MP3 file, Bitrate 64 kbps. Cut-off at 11kHz.
MP3 file, Bitrate 128 kbps. Cut-off at 16 kHz.
MP3 file, Bitrate 192 kbps. Cut-off at 19 kHz.
MP3 file, Bitrate 320 kbps. Cut-off at 20 kHz.
M4A file, Bitrate 500 kbps. Cut-off at 22 kHz.
FLAC file, Lossless quality (Bitrate usually 1000 kbps or higher). Graph's drawn continuously, no cut-off.
Now, using that as a reference, you should see [something like this.] (http://i.imgur.com/9ktfCxl.jpg) Clearly, this file is really 320 kbps, as it 'cuts off' at around 20 kHz (the numbers on the left side of the screen).
However, if you downloaded something that says 320 kbps for example, that does not necessarily mean it is 320 kbps, regardless of what iTunes will tell you. The other day I went to download the new Miguel EP, and the Datpiff download said 320 kbps. So I checked it, and this is what it looked like. It SAYS 320, but using our reference, we can tell it is actually just 128 kbps. This is called a transcode. Sites may do this to get more attention, sporting '320 kbps' looks nice even if it is actually 128 kbps. Not alot of people are gonna go the lengths to look into it if it's legit or not.
Real Time Bitrate Tool For Mac
Itool For Mac
M4A files generally don't suffer from the 'trying to trick you into files being a higher bitrate than they are', because they're usually iTunes purchases. iTunes uses AAC, and it looks something like this.
Hope this helps! If there's anything I'm wrong about or something I should add, tell me.
Snipping Tool For Mac
It can decode MPEG1, MPEG2, MPEG4 (aka DIVX4/5), VOB, AVI MS-MPEG4 V3 (aka DIVX 3), WAV, Real Audio, H263(+) (aka RealVideo 1.0), PGM, YUV, PPM, AC3, PCM8/16 bits, mulaw/Alaw, SUN AU format, MPEG audio layer 2, MPEG audio layer 3, MJPEG and even more formats.
ffmpegX can operate more than 20 powerful Unix open-source video and audio processing tools.
This GUI provides quick encoding to DivX, MPG1, MP2, MP3 & AC3. You can therefore convert DVD video to DivX, DivX to VCD or XVCD, and DVD to VCD or XVCD. Includes a bitrate calculator and an mpeg splitter for multiple CD output
When encoding to MPEG-1 it can author it as XVCD (.bin/.cue files for burning with Cdrdao, or with Toast by dropping the .bin into VCD window) or XSVCD (two .img files to be burned in Toast under Multitrack XA window)
Features:
* As simple as 1.2.3 : Drop a file, choose a destination format, and click 'Encode'.
* Reads the following input formats: MPEG-1, MPEG-2, MPEG-4, DIVX, XviD, non-encrypted VOB and VIDEO_TS, Quicktime .MOV, .DV, .WAV, Real Audio, Real Video, H.263, MP4 H.264, PGM, YUV, PPM, AC3, PCM8/16 bits, mulaw/Alaw, WMA-1/2, SUN AU format, MP2, MP3, AAC, 3GP, FPS1, ALAC, and even more formats
* Converts the above formats to DivX, AVI XviD, H.264 MP4, MOV, DV, 3GP, Sony PSP, MP2, MP3, AAC, AC3, MPEG-1, MPEG-2, VCD, CVD, SVCD, KVCD, KSVCD, DVD, KDVD and MPEG-TS with complete control over encoding options.
* Super-fast. Many conversions are faster than realtime. DIVX encoding on a G5 dual is twice as faster as realtime.
* Queue encodings in the ffmpegX Progress window.
* Includes a full-featured universal video player (mplayer) supporting VOB and text subtitles, with choice of fonts, font sizes and international text encodings including Japanese, Chinese, Russian, Greek and more.
* Supports subtitles in VobSub, SubRip, MicroDVD, SubViewer, Sami, VPlayer, RT, SSA, AQTitle, JACOsub and MPsubt formats
* Allows creation of DVD selectable subtitles
* Includes a subtitle converter with OCR from VOB image format to SRT text format.
* Includes a bitrate calculator to control best image quality and target filesize.
* Includes an automatic crop tool.
* Includes a series of video tools like split, join, fix, mux, demux.
* Compresses a non-encrypted DVD to 4GB without reencoding it.
* Reauthors SVCD as DVD.
* Creates DVD image files from VIDEO_TS folders.
* Converts SRT subtitles to DVD Studio Pro 1.5 format.
* Creates AVI or MPG files with two audio tracks.
* Authors as VCD or K/XVCD (.bin/.cue files for burning with Toast by dropping the .bin into VCD window).
* Authors as SVCD, CVD or K/XSVCD (two .img files to be burned in Toast under Multitrack XA window).
* Authors as DVD (/DVD/ folder for burning in Toast DVD mode, and .img file for burning in Disk Image app or Toast disk image mode).
What's New:
- Fixes for Leopard compatibility
- Added iPhone preset
- Added metadata in FLV encoding (to enable progress indicators in Flash video playback).