Post by thread:[OT]: mp3 memory required per minute??

HI YOU GET DIFFERENT RATES BUT AVERAGE IS 1 MB PER MIN IVAN ----- Original Message ----- From: "rad0" <.....rden25KILLspam@spam@MINDSPRING.COM> To: <PICLISTKILLspamMITVMA.MIT.EDU> Sent: Thursday, December 06, 2001 12:05 PM Subject: [ot]: mp3 memory required per minute?? {Quote hidden}> hello, > > I would like to know if anyone knows how much memory is required > per minute for using an mp3 recorder? > > If you have any info on this, please let me know, and could you please > let me know the resolution of your mp3 recording? > > Thanks > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

> I would like to know if anyone knows how much memory is required > per minute for using an mp3 recorder? It depends upon the bit rate of the mp3. A 256kbps mp3 will require 32kBps, for example. Which (obviously) means 1.9MBpm. Half the bit rate, half the memory required. Approximately... The trade off is quality (high bit rates) vs quantity (file size). Decide what works for you - most personal player manufacturers seem to base their storage time on 96kbps mp3s, from what I've seen. Try this site for more info: http://www.mp3-faq.org/ HTH Peter This email, its content and any attachments is PRIVATE AND CONFIDENTIAL to TANDBERG Television. If received in error please notify the sender and destroy the original message and attachments. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

MP3's are rated in kbps (kilo bits per second) so n kbps = n/8 * 60 / 1000 mpm (megs per minute) Typically 128kbps stereo mp3 = 0.96 megs/minute. R. >> hello, >> I would like to know if anyone knows how much memory is required >> per minute for using an mp3 recorder? >> If you have any info on this, please let me know, and could you please >> let me know the resolution of your mp3 recording? >> Thanks >> -- >> http://www.piclist.com#nomail Going offline? Don't AutoReply us! >> email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email KILLspamlistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

rad0, Do you mean "bit-rate" when you mention resolution? The bit-rate determines how much memory an MP3 takes (plus the ID3 tags). Basic formula (for constant bit-rate) is: Memory(bytes) = Length of song or voice clip (seconds) * bit-rate (kilobits per second) / 8 (bits per byte). Plus a few measly hundreds of bytes for tags (ignoring all the evil new extensions like embedded images such as album covers, embedded lyrics etc!) E.g. for a 5-minute song (300 seconds), encoded at 192kbps, you get roughly (pedants forgive me if the "kilo" is 1024): 7,200,000 bytes = 300 * 192,000 / 8 i.e. about 7 MB (megabytes - note that often hardware memory is specified in megaBITS, 8 times smaller than you think!) The same applies for ABR (see below). With plain VBR you can't really calculate how much memory you'll need, except for maybe an upper limit (encoding can't ever go above 320kbps maximum MP3 bitrate, so calculate above formula using that as a CBR and you've got absolute worst-case VBR memory consumption! But you can sometimes limit the upper bitrate of VBR encoding too, so take that with a grain of salt.) What is your application? If you are recording voice, don't use MP3, use a voice-specific codec. If you are recording music, decide the quality you want, and whether you will be recording using a constant bit-rate (CBR) or variable bit-rate (VBR). Average bit-rate (ABR) is VBR that's guaranteed to take a similar amount of memory as an equivalent CBR encoding, but with the quality advantages of VBR. I can explain these further if you wish. For reasonable quality music (non-archival quality!) use about 192kbps CBR, or VBR. Do you intend making / using a hardware encoder in realtime? If so, VBR or ABR might not be available. Also note that the higher your bitrate, the harder your hardware / software that buffers the output of the encoder to your storage (memory, disk, whatever) has to work! Er, have I said enough yet? I'm happy to help with further info if I can. Please note the capital "OT" in the subject-line too (for some people's email filters). Cheers, -Dave. rad0 <rden25@MINDSP To: RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU RING.COM> cc: Sent by: pic Subject: [ot]: mp3 memory required per minute?? microcontrolle r discussion list <PICLIST@MITVM A.MIT.EDU> 12/06/01 08:05 PM Please respond to pic microcontrolle r discussion list hello, I would like to know if anyone knows how much memory is required per minute for using an mp3 recorder? If you have any info on this, please let me know, and could you please let me know the resolution of your mp3 recording? Thanks -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com hint: To leave the PICList TakeThisOuTpiclist-unsubscribe-requestEraseMEspam_OUTmitvma.mit.edu