ittigson at pobox.com
Fri Mar 7 22:57:33 CET 2003
i'm interested in using mplayer as a means of gathering file
attributes about movies. the -identify flag is pretty much perfect
for what i'm looking for. my question relates to exactly what some of
the fields mean.
i have a file with an mpg extension. calling identify, i get possibly
three responses to the question of, "what kind of file is this?"
first is the demuxer deciding and reporting that it's an MPEG-PS file
(what does that mean?) in demux_open_stream. in the next line of the
-identify output it's described as MPEG1 (in video_read_properties).
then the ID_VIDEO_FORMAT field reports that it's 0x10000001. which
should i take as the general video format (for a non-mplayer
classification of that video)?
then there's the ID_VIDEO_ASPECT field. in this same mpg, where the
aspect is described as 12 in the video_read_properties call it's
reported as 1.3333 in the identify code.
finally, on the audio side. the ID_AUDIO_CODEC is described as mp3.
the ID_AUDIO_FORMAT is described as 80. and there's a whole mess of
information printed out above while the audio codec is being
initialized (in init_best_audio_codec).
thanks for your help in describing these differences. also, if anyone
has a suggestion for better or more general ways i could be using
mplayer to accomplish my task i appreciate it. also, how "static" are
these descriptive and codec related names? if i relied on mplayer as
my "namer" for this project, is there any likelihood that, for
instance, today's MPEG-PS would be something else tomorrow?
verna: come on, tom, you know me a little. ~ matt ittigson
tom: nobody knows anybody--not that well. ~
verna: you know or you wouldn't be here. ~ ittigson at pobox.com
- miller's crossing ~
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