What is the best bit rate for video and sound and what is it?
Common characteristics of video and audio recordings include the so-called bit rate. Some users do not know how important this figure plays when playing files, along with their size and resolution.
What is the bit rate? The bitrate is the number of bits that are used to process and transmit data during a certain period of time. This measurement is used to measure the effective transmission rate on a data stream channel. In other words, this is the minimum value of the channel capable of passing the flow without delay. The measure of video bit rate is bits per second and its derivatives (kbps, Mbps, etc.). In audio and video transmissions that use degrading compression, this term refers to the degree of compression of the transmission. Consequently, it indicates the size of the channel within which compression took place. Compression modes In practice, there are three modes of stream compression that cause quality loss: Constant Bit Rate (or CBR).
In this encoding option, the initial bit rate is set by the user and then does not change for the entire duration of the audio or video. Its advantage is that it is quite easy to calculate the size of the final file. However, this encoding is not very suitable for audio files that have dynamically changing sound, as it does not provide a good size / quality ratio. Variable bit rate (or VBR). The bitrate value is selected by the codec, depending on the parameters (the expected quality level). During the encoded fragment, the value of the bit rate may change. When audio is compressed, the required bit rate is set based on the psychoacoustic model. This encoding achieves the best sound quality ratio, but it is difficult to calculate the exact size of an audio or video recording. It can be very different. Average Bit Rate (or ABR). This is a hybrid of the first two modes.
The initial value of the bit rate is set by the user, but then independently changed by the program within certain limits. At the same time, the difference with VBR is that the codec uses the maximum and minimum values within the limits set by the user, and does not exceed them. This encoding allows you to set the processing speed in the most flexible way and allows you to determine the file size with greater precision. What is the Getcontact application and how to use it
What and how is it measured? When quantifying high data rates, metric or decimal prefixes are used. It looks like this: Speed 1000 bps = 1 kbps (one kilobit or one thousand bits per second). Speed 1,000,000 bps = 1 Mbps (one megabit or one million bits per second). Speed 1,000,000,000 bps = 1 Gbps (one gigabit or one billion bits per second). What bit rate should I choose? In terms of the common MP3 audio format, it is the audio compression that results in data loss. The higher the bit rate, the better the sound quality. Speaking of the choice of the bit rate for this format, we can say the following: 32 kbps: very low quality sound (valid only for voice recording); 96 – May be applicable for low quality audio transmission or voice recording; 128 and 160: allows you to encode music recordings at an entry level; 192 – music encoding in acceptable quality; 256: high quality music recording; 320 is the highest quality you can get in MP3 format. In video formats, this value is calculated differently. For example, for videos on YouTube, a bit rate of 10-16 Mbps at 720p is sufficient. This will achieve a clear image and a small file size.
If better image quality is required, this value can be increased to 18-25 Mbps. The highest image quality will be achieved at 50 Mbps and 1080i resolution. In general, the effect of bitrate on video quality is expressed as follows: Yandex.Direct18 + Make money building websites! SITE.ONLINESCHOOL-PROFI.RU Make money writing articles COPYWRITING.ARTUR-GRANT.RU 400 kbps: low quality video at 240p; 750 kbps, 1 Mbps: can be used for some YouTube videos at 360p and 480p, respectively; up to 1.15 Mbps – compressed video in VCD format; 2.5 and 3.8 are compressed videos for YouTube, recorded at 720p; 4.5 and 6.8 are sharper YouTube videos but still compressed at 1080p resolution. 9.8 – DVD video recordings; 8-15 – high definition video recording using compression; 19 and 25 are HDV (high definition) recordings created at 720p and 1080i, respectively; 29.4 – high quality HD DVD video; 40 – Blu-Ray Disc recorded at 1080p; 250 – DCP format; 4Gbps: Uncompressed 1080p video recording.
