Ok, ho rifatto tutto su un PC nuovo di zecca.
Probabilmente ecco cosa manca:
devi copiare i filesinttypes.h
estdint.h
in
C:\Users\<Nome utente>\AppData\Local\Programs\Common\Microsoft\Visual C++ for Python\9.0\VC\include
I files li puoi prendere qui
Fammi sapere!
... scaricato e installato VC for Python e copiato i files nel folder da te indicato ... ancora nulla ... stesso (o quasi ...) errore

running config
looking for avformat_open_input... missing
looking for pyav_function_should_not_exist... missing
looking for av_calloc... missing
looking for av_frame_get_best_effort_timestamp... missing
looking for avformat_alloc_output_context2... missing
looking for avformat_close_input... missing
looking for avcodec_send_packet... missing
looking for AV_OPT_TYPE_INT...missing
looking for PYAV_ENUM_SHOULD_NOT_EXIST...missing
looking for AV_OPT_TYPE_BOOL...missing
looking for AVStream.index... missing
looking for PyAV.struct_should_not_exist... missing
looking for AVFrame.mb_type... missing
We didn't find `AV_OPT_TYPE_INT` in the libraries.
We look for it only as a sanity check to make sure the build
process is working as expected. It is not, so we must abort.
AD MAIORA
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