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H.264 compression ratio
Two questions:
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?
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?
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5 Replies
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1. Depends on the specs of the camera.
2. Depends on the source.
A = source
B = compressed outputCompression 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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Daniel,
Thanks for your response. I am still unable to get even approximate answers to my two questions from those links though.
Mike S.
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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?
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Actually, thinking about it, it’s impossible to answer question 1 without specific technical specifications for the camera.
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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. =============
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