H.264 compression ratio

[Daniel Low]

1. Depends on the specs of the camera.

2. Depends on the source.

A = source
B = compressed output

Compression ratio is how much is ‘A’ compressed by to become ‘B’

https://en.wikipedia.org/wiki/Ratio
https://en.wikipedia.org/wiki/Video_compression
https://en.wikipedia.org/wiki/Image_compression

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[Mike Sato]

Daniel,

Thanks for your response. I am still unable to get even approximate answers to my two questions from those links though.

Mike S.

[Daniel Low]

OK

I’ll try answering it in this way:

1. How many Megapixels is the camera and how many megabytes does 1 minute of 1280×720 H.264 video from that camera take up in space?

2. What is the format, frame size and datarate of the source you used to create the MPEG-2 and how long is it in total?

__________________________________________________________________
Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!

[Daniel Low]

Actually, thinking about it, it’s impossible to answer question 1 without specific technical specifications for the camera.

__________________________________________________________________
Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!

[Mike Sato]

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> 1. Anyone know what the approximate compression ratio is when a digital still camera uses H.264 to compress a 1280×720 video into a .mov file? < >> Actually, thinking about it, it’s impossible to answer question 1 without specific technical specifications for the camera. << OK. Just looking for a ballpark answer if anyone has an idea. ============= > 2. If the average playback bit rate for 720×480 video on a standard DVD is 5 Mb/sec, what would the approximate MPEG-2 compression ratio be? < >> 2. What is the format, frame size and datarate of the source you used to create the MPEG-2 and how long is it in total? << Say a commercial DVD movie that is 2 hours long and has wide screen or 4:3 full screen pan & scan viewing options. =============