What is a bit rate?
Detailed Explanation of Bitrates for Video and Music Files Part 3
If you compare them closely, you can clearly see the difference. High-bit-rate video data is beautifully displayed on desktop wood grain and guitar string details, but on low-bit-rate video data, details are squashed and block noise appears on the front of the sofa. .
Setting a low bit rate reduces data capacity, but has the disadvantage of degrading image quality.
Block noise Noise
which appears as a square block when the display data is simplified into images.
Difference in sound quality based on bit rate
Waveform image with high audio bit rate
High bit rate audio file waveform (1536k bps)
Waveform image with low audio bit rate
Low bit rate audio file waveform (32k bps)
It is a comparison of two data with the same music data but with different bit rates. If you look at the waveform, you can clearly see that the height and density of the waveform are smaller for the music data with a lower bit rate because the data is removed.
Audio files with a low bit rate will sound like you are listening to a radio cassette player.
How does the image quality and sound quality change when the bit rate is converted?
The bit rate can be changed later by encoding work.
If you convert high bit rate video or audio data to a low bit rate, the image quality and sound quality will be reduced as the bit rate is set low for both image quality. as for sound quality. At this time, if the image quality and sound quality after conversion are within the allowable range, there is basically no problem.
Conversely, converting low bit rate video and audio data to high bit rate causes problems. If you check the converted data, the bit rate certainly becomes high, but there is no change in image quality or sound quality.
It should be noted here that it cannot be converted to a quality higher than the image quality and sound quality of the video and audio data that have already been converted to data.
If you want high image quality and high sound quality, you need to be careful about the timing of the video data creation and the setup of recording devices such as video cameras.
Note that you can basically reduce the high bitrate things, but not the low bitrate things.
Relationship between bit rate and frame rate
Simply increasing the frame rate will increase the bit rate.
For example, if you have 60fps and 30fps videos, the 60fps video will require twice the bit rate.
However, keep in mind that the actual bit rate may differ depending on the encoding method used when creating the video file. Keep it in mind as a guide.
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Finally
To summarize the bit rate
Data flow for 1 second, unit is bps
The higher the bit rate, the more data will move
If the bit rate is high, the videos and music will be beautiful. But the file size also increases
The lower the bit rate, the smaller the file size. But the videos and music deteriorate
Even if you convert a low bit rate to a high bit rate later, the quality does not change, but the file size increases.
As the frame rate increases, so does the bit rate. Simply because the amount of information (amount of data) per second increases.
This concludes the explanation of bit rates.
