The basic formula is: File Size (bits) = Duration (seconds) * Bit Rate (bits per second). It’s important to realise that mp3 file codecs (CODEC is short for encode/decode) are usually expressed in kbps, which stands for kilobits PER SECOND, in other words, this is the amount of data which is streamed per-second when you play the file, which is why it’s called the bit rate – it DOES NOT refer to the total number of bits in the file itself the file size is determined by the duration of the encoded audio multiplied by the bit rate. It sounds as though you have recorded your audio book as mp3 files, yes? In terms of mp3 file encoding, describing a file as 128 or 129 “bits” makes no sense. 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). Good online access to stats.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. And I did, a little peace of mind is always nice.ħ-Zip: is nice as a benchmark tool since I know of a couple websites that will throw that in when testing the latest and greatest.įurmark: lightweight GPU benchmark. I absolutely wanted to verify that I got what I paid for. My old Win7 laptop got some love with an SSD upgrade. An HDD in an enclosure for a backup drive. Is CPU and GPU envy an illness or a disease? Either way I seem to have been afflicted for years!ĬrystalDiskMark: used to verify read/write speeds on drives.
If I want to do an upgrade it’s nice to be able to see what different hardware configurations are seeing compared to current hardware. Wow! That’s a big download! I’ll have to pass. Now You: do you run benchmarks? If so, which do you use? It does not run gaming related benchmarks however, so keep that in mind. The benchmark is well designed and covers several core home use scenarios.
It focuses on benchmarking home PC use scenarios, and includes the Essentials and Productivity test groups only. PCMark 10 Express - This benchmark has a shorter run time than the other two benchmarks.It is the most complete benchmark of the application. PCMark 10 Extended - This benchmark expands the main benchmark of PCMark 10 Basic by running gaming tests that measure GPU and CPU performance.These are locked, and become available when you upgrade the program to the Advanced version. The application highlights two additional benchmarks. Since there is no way of saving a result, you may want to capture a screenshot of it if you plan to compare the run to future benchmark runs. The options to load and save the benchmark, and to view it online, are only available in the Advanced version. There is little else that PCMark 10 Basic users can do at this point. The benchmark displays a final score, scores for each test group, and scores for each individual test in the end.