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Frame rate for analog to digital video conversion

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watertreader

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Hi,

Have a query on video encoding from analog input source, say an NTSC soucre at 30 frame per second. If I am to use an MPEG2 or MPEG4 encoder, what would be the output frame rate? Would they be in constant frame rate if they are to subject to the variable bit rate for MPEG2 and MPEG4?
 

You can decide the output frame rate yourself although there is considerably more processing needed if it's different from the input rate. Normally you want the output frame rate to be constant, otherwise it would be difficult to synchronize with display devices but the bit rate can be variable. Provided it is high enough, the bit rate determines the quality of picture rather than the quantity (frames per second) and it can change dynamically acording to picture content.

Brian.
 
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