CBR or CQP

[Maxpot]

what is CQP and is it better than CBR?

[Stevie Wonder]

In video encoding, CQP (Constant Quantization Parameter) and CBR (Constant Bit Rate) are both rate control methods that are used to control the bitrate and quality of the encoded video.

CQP is a rate control method that keeps the quantization parameter constant throughout the encoding process. The quantization parameter controls the amount of compression applied to each frame, with higher values resulting in more compression and lower quality, and lower values resulting in less compression and higher quality. With CQP, the encoder maintains a constant level of compression, which can result in a consistent level of video quality, but at the cost of using varying amounts of bits for each frame.

CBR, on the other hand, keeps the bitrate of the encoded video stream constant throughout the encoding process, regardless of the complexity of the scene. This can result in a consistent level of video quality, but at the cost of potentially wasting bits on simpler scenes, as the same amount of bits are allocated to every frame.

In terms of which method is better, it depends on the specific requirements of the application. CQP is commonly used in situations where consistent video quality is important, such as in video conferencing, where the bitrate can vary depending on the network conditions. CBR, on the other hand, is commonly used in situations where a fixed amount of bandwidth is available for the video stream, such as when streaming video over the internet.

It's worth noting that there are other rate control methods available in video encoding, such as Variable Bit Rate (VBR) and Average Bit Rate (ABR), which adjust the bitrate according to the complexity of the scene or maintain a constant average bitrate, respectively. The choice between rate control methods depends on the specific requirements of the application, such as the available bandwidth, the desired video quality, and the expected complexity of the video content.

[Maxpot]

Originally posted by Stevie Wonder:

In video encoding, CQP (Constant Quantization Parameter) and CBR (Constant Bit Rate) are both rate control methods that are used to control the bitrate and quality of the encoded video.

CQP is a rate control method that keeps the quantization parameter constant throughout the encoding process. The quantization parameter controls the amount of compression applied to each frame, with higher values resulting in more compression and lower quality, and lower values resulting in less compression and higher quality. With CQP, the encoder maintains a constant level of compression, which can result in a consistent level of video quality, but at the cost of using varying amounts of bits for each frame.

CBR, on the other hand, keeps the bitrate of the encoded video stream constant throughout the encoding process, regardless of the complexity of the scene. This can result in a consistent level of video quality, but at the cost of potentially wasting bits on simpler scenes, as the same amount of bits are allocated to every frame.

In terms of which method is better, it depends on the specific requirements of the application. CQP is commonly used in situations where consistent video quality is important, such as in video conferencing, where the bitrate can vary depending on the network conditions. CBR, on the other hand, is commonly used in situations where a fixed amount of bandwidth is available for the video stream, such as when streaming video over the internet.

It's worth noting that there are other rate control methods available in video encoding, such as Variable Bit Rate (VBR) and Average Bit Rate (ABR), which adjust the bitrate according to the complexity of the scene or maintain a constant average bitrate, respectively. The choice between rate control methods depends on the specific requirements of the application, such as the available bandwidth, the desired video quality, and the expected complexity of the video content.

thanks

[JaredX7]

CQP is better for local recordings, you want the utmost quality. You can always edit & render the footage in Vegas/Premier Pro afterwards if the filesize is too much for you to upload to YouTube.

CBR is more for streaming.

[Maxpot]

Originally posted by 💎 NoVa 💎:

CQP is better for local recordings, you want the utmost quality. You can always edit & render the footage in Vegas/Premier Pro afterwards if the filesize is too much for you to upload to YouTube.

CBR is more for streaming.

thanks