On Thursday 13 Feb 2003 7:31 am, you wrote:
> Hi everybody,
> each time I do something with mjpegtools, I think about
> meaning of INFO: messages from mpeg2enc.
> for ex.:
> INFO: [mpeg2enc] GOP LENGTH = 12
> INFO: [mpeg2enc] Frame start 262 I 2 264
> INFO: [mpeg2enc] Frame end 262 307.19 14390.01 10.0 2652.17
> INFO: [mpeg2enc] Frame start 263 B 0 262
> INFO: [mpeg2enc] Frame end 263 34.73 14424.74 10.0 2662.17
Format:
frame activity (an internel measure roughly proportional to the number of
bits required to encode it).
total activity so far
frame quantisation (how accurately the DCT coefficients of the encoded image
could, on average, be coded whilst staying within the maximum bitrate
specified).
Total frame quantisation so far.
> It is possible to read from these numbers something useful about
> encoding process? For example, I'm interested how to detect high motion
> scenes in material, may I find them by inspecting mpeg2enc log?
Motion not directly, but a high activity indicates a frame with a lot of
changes over its neighbours. A quantisation indicates that the mpeg2enc is
having trouble encoding without significant quality loss...
cheers,
Andrew
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