How to improve video sound quality? – Sample size, sample rate, bit rate
Sound is an integral part of video.
As was the case with the author, initially I will handle the video with the stance that it is only necessary to make a sound.
However, as I went over and over again, I gradually began to wonder “how can I make a good sound” and “what kind of knowledge do I need to have to optimize the sound parameters?” I will come.
In this article, we will explain the sound of videos, learn how to make it “sound good”, and what kind of knowledge should be used to control the sound quality and amount of audio data.
What is “video sound”?
There are several types of voice data.
Parameters related to the sound quality of audio data
Sample size (bit depth)
Sampling rate
Bit rate
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What is “video sound”?
Video is a combination of video and audio data.
Video and audio are separate, and a video file is a combination of different data methods (codecs).
You already covered this in detail in a previous article, so check it out.
http://blog.socialcast.jp/06/post-198/
Since the video file has the above structure, the image quality and sound quality can be adjusted separately.
Therefore, the sound quality of the video depends on the audio data part. .
There are several types of voice data.
There are several data methods for voice data.
There are two main types, each of which has multiple codecs (data methods).
lossless codec
A data method that has a low compression rate but can restore the original sound quality.
FLAC, ALAC, etc
lossy codec
A data method that has a high compression rate but cannot restore the original sound quality when played back.
MP3, AAC, WMA, etc
What is used in Internet video is a lossy codec with a high compression ratio.
There is a lot of AAC and MP3, and it seems that most of the videos that are generally seen these days are AAC.
Therefore, to aim for high sound quality in Internet video distribution, it is important to understand how the sound quality of AAC or MP3 (lossy codec) goes up or down.
