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How does bitrate work? (1 Viewer)

Allan^L

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On my JVC DVD player, there's a button that lets me see the bitrate of the DVD currently playing. When I read reviews, the bitrate is mentioned as being 6.5 or 8.0 or whatever. When I press this button though, the bitrate fluctuates wildly, changing every second. How do you know the bitrate is 6.5 (for example) when the number keeps changing?
 

Allan^L

Stunt Coordinator
Joined
Mar 5, 2004
Messages
106
On my JVC DVD player, there's a button that lets me see the bitrate of the DVD currently playing. When I read reviews, the bitrate is mentioned as being 6.5 or 8.0 or whatever. When I press this button though, the bitrate fluctuates wildly, changing every second. How do you know the bitrate is 6.5 (for example) when the number keeps changing?
 

Lev-S

Second Unit
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Jun 29, 2003
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What you are seeing is VBR (Variable Bit Rate). Basically, certain colors and patterns in video information contain more or less information than others and require more or less size (bits) to store it in. Just like MP3s, a higher bit rate usually means a better picture, which is co-dependant on the source material. Hope that was somewhat clear! :D
 

Lev-S

Second Unit
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Jun 29, 2003
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What you are seeing is VBR (Variable Bit Rate). Basically, certain colors and patterns in video information contain more or less information than others and require more or less size (bits) to store it in. Just like MP3s, a higher bit rate usually means a better picture, which is co-dependant on the source material. Hope that was somewhat clear! :D
 

Michael Reuben

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That's the average bitrate. I've often wondered, though, how reviewers go about determining the average.

M.
 

Michael Reuben

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That's the average bitrate. I've often wondered, though, how reviewers go about determining the average.

M.
 

Mark_vdH

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Isn't the average bitrate also easily calculated by dividing the amount space the movie takes (in Mbits) with the total length (in seconds) of the movie?
 

Mark_vdH

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Isn't the average bitrate also easily calculated by dividing the amount space the movie takes (in Mbits) with the total length (in seconds) of the movie?
 

Christ Reynolds

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if you can determine the amount of space the video material takes up, yes. since the audio is at a fixed bitrate, this shouldnt be too hard of a task.

CJ
 

Christ Reynolds

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if you can determine the amount of space the video material takes up, yes. since the audio is at a fixed bitrate, this shouldnt be too hard of a task.

CJ
 

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