int mk_write_header( mk_writer *w, const char *writing_app,
const char *codec_id,
const void *codec_private, unsigned codec_private_size,
int64_t default_frame_duration,
int64_t timescale,
unsigned width, unsigned height,
int mk_write_header( mk_writer *w, const char *writing_app,
const char *codec_id,
const void *codec_private, unsigned codec_private_size,
int64_t default_frame_duration,
int64_t timescale,
unsigned width, unsigned height,