In other words, what’s important here is the time it takes to play back the audio, and not the size of the audio file(s) from which the audio CD is produced. Labelling varies between manufacturers but, for example, CDs made by TDK are labelled CD-R74 (for 74 minutes) and CD-R80 (for 80 minutes) and so on. That’s why, when you buy a CD-R for writing CD audio, you should take note of the maximum playback time the CD can hold, rather than just its’ data capacity in terms of megabytes. Because of this, the limit a disc can contain when written as an audio CD is measured in time and not in bytes/megabytes etc. This bitstream data is read by your CD player when the disc is played back. However, when you write to a CD-R as CD audio, the LPCM (Linear Pulse Code Modulation) data in the original file is used to write bitstream data to the CD-R instead. for backup or storage), then it will be able to hold the maximum number of megabytes stated by the CD-R manufacturer on the disc label (usually either 650 or 700 MB). When you simply copy data files from your computer to a CD-R (including audio files such as. You’re very welcome, William! And that’s a good question which highlights the differences between when a CD-R is used for data storage as opposed to when it’s used as an audio CD. You can just use the “compressed” result to predict their file size (you’ll notice that this compressed output file-size result is unaffected by any sample rate, bit depth, or channel information you may have entered). The number of channels in this case is effectively irrelevant in calculating their file-size – what’s important is the bit-rate. In post production however, these uncompressed mixes are often converted into a delivery format such as DTS, AC-3 or similar, and these are compressed formats (similar to mp3’s) which employ matrix technology to encode the channels. That’s why, when calculating the size of an uncompressed, multichannel audio file it’s important to specify the sample rate, bit depth and number of channels that file contains (hence the labelling in the channel drop-down menu to which you refer) as these elements can dramatically affect the file-size. wav file), a 5.1 mix always requires 6 channels, a 6.1 mix requires 7 channels and so on (the “.1” is the LFE, or Low Frequency Enhancement channel, which is designed to contain low frequency content, but the producer can decide exactly what to put there, so it needs its’ own channel). Hi Alberto, When producing surround sound audio to uncompressed audio (e.g., a multichannel. If you find this useful and/or have any comments or suggestions then do let me know via the comment section below (please read our website rules before posting). Note that the file size reported by your device may vary slightly from that shown due to file allocation methods, possible differences in the amount of header information and/or the fact that some operating systems calculate hard disk space differently from others (e.g., some calculate it in binary and call 1kB 1024 bytes whilst others – and most hard drive manufacturers – calculate it in decimal and call 1kB 1000 bytes) – this calculator handles both methods. For compressed files encoded with VBR (Variable Bit Rate), the displayed file size can be slightly less accurate because in this case the bit rate can vary depending on the programme material. For compressed files encoded with CBR (Constant Bit Rate), the displayed file size should be as accurate as possible (notwithstanding variables such as header information etc- see below). requires only the Bit Rate information (in this case the Sample Rate, Bit Depth and Channel information is ignored). In addition to the duration, calculating the size of compressed files such as MP3 etc. Calculating the size of uncompressed files also requires the Sample Rate, Bit Depth and Channel information (but not the Bit Rate, which is automatically calculated). Duration Hours: Minutes: Seconds: Milliseconds: Settings - Uncompressed (WAV, AIFF etc.) Sample Rate: Bit Depth: Channels: Settings - Compressed (MP3, AAC etc.) Bit Rate (kbps): (kilobits per-second) Reset Uncompressed (WAV, AIFF etc.) Bit Rate: 1411.2 kbpsĠ Compressed (MP3, AAC etc.) Bit Rate: 0 kbpsĮnter the duration of your file in hours, minutes, seconds and milliseconds.
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