Bit Rate and Video Quality
CORRELATION BETWEEN BIT RATE & VIDEO QUALITY
When dealing with video quality and file size, it is important to understand how bit rate affects your video. Bit rate refers to the amount of data used to encode video or audio. A higher bit rate will product a higher quality video/audio. However, a higher bit rate will also mean a much larger file size.
The type of codec will also affect the quality of your video. For example, if you have the same bit rate but if you output your video with an older codec such as H.263 instead of H.264, your video will have a considerably lower quality.
Note: Bit rate is independent of the resolution, the type of hardware your dash cam uses, frame rate, and codec.
WHAT IS THE DIFFERENCE BETWEEN CBR AND VBR ENCODING?
CBR vs VBR
CBR (Constant Bit Rate)
When you choose to output your video with a target constant bit rate, the same bit rate is maintained throughout the entire clip. This is ideal when streaming videos to prevent lag.
VBR (Variable Bit Rate)
With a variable bit rate, a target minimum and a maximum bit rate is set. Each frame is calculated and determined if it needs a lot of compression or little compression. With this type of processing, you will typically see a higher quality video.
Uploading Videos to YouTube
Many users have noted that videos uploaded to YouTube never have the same type of quality as the original. This is because YouTube compresses your video to optimize for streaming. Whenever uploading to YouTube, upload your video with the highest bit rate possible.
DETERMINING THE Bit Rate of Your Video
Below we compare 2 other popular dash cams at max resolution. From left to right we have the DEFENDR+, the Blackvue dr650s and the Thinkware f770. To view the bit rate of your video, right click to view the videos properties.