Thanks for your help:
according to media info from mpchc the m2ts reports nothing (maybe there is a better tool to extract info from m2ts stream)
the source is bluray
i have doubts with these options:
videoformat -> undef / unknown
fullrange -> on?
colorprim ->bt709? (do al the bluray discs use bt709?)
transfer ->bt709? (do al the bluray discs use bt709?)
colormatrix->bt709? (do al the bluray discs use bt709?)
chromaloc = 0?
nal-hrd->none?
i found this info, dont know if its accurate:
Quote:
More specifically:
–colormatrix specifies what coefficients are used when converting YUV to RGB. This is the one you want to use.
–colorprim specifies what color primaries (see for example the Wikipedia page about sRGB) the RGB uses. Setting this properly most likely requires knowledge of the studio equipment used to master the stream and/or its settings, so just leave it undefined. No one without a color calibrated monitor would ever notice or care, even if decoders/renderers actually supported this.
–transfer specifies the gamma curve used for the RGB. Like –colorprim, setting this correctly probably requires knowledge you don’t have, so don’t set it at all. Again, only people with calibrated studio monitors will ever notice or care.
TL;DR: Use --colormatrix bt709 if your source is a HD transport stream; --colormatrix bt470bg if it is an SD transport stream.
source: http://mod16.org/hurfdurf/?p=116
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thanks again