Hi,
Am 23.02.2010 15:41, schrieb Andy Walls:
On Tue, 2010-02-23 at 14:55 +0100, Johan Persson wrote:
Since my knowledge of the details of the MP2 stream produced by a caputure card
(+ ivtv) driver is rather vague so before I start to immerse myself in standards
documents I was wondering if there is some "shortcut" to find out the overall
length (in min or sec) for a saved MP2 file from the capture card without having
to write a (semi-) complete MP2 decoder onseself?
I'm thinking of using the libmpeg2 but before I start analysing the headers and
example programs (there is no documentation) I thought I would ask.
In the ivtv-utils source, there is a ps-analyzer utility which dumps out
a lot of information (e.g. timestamps of every frame), but at the end
you get this:
Statistics:
video frames: 554
audio frames: 436
private packets: 554
total time: 18.35 seconds
It doesn't have ot be precise on the second; +/- 1 min accuracy is good enough
for my purposes.
A fellow on the linux-media list just provided a patch to correct some
time reference decoding problems in ps-analyzer, but I have not checked
it in yet.
You find the patch here:
http://www.spinics.net/lists/linux-media/msg15744.html
Regards,
Lars.
Check the output of the current ps-analyzer against known sample mpegs
that you have timed yourself.
Regards,
Andy
/Johan
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