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Thread: Re: -ss and -endpos not exact




Re: -ss and -endpos not exact
country flaguser name
Hungary
2007-12-28 03:00:54
Dear Stefan,

thank Yor for the idea! Maybe I'll try it, but at first I
try to solve this
problem with mencoder and cygwin having the chance that I'll
fail... 

After a while I had some progress. Reading the man page
again I found a solution
for the part of my proble. It is possible to cut different
parts from a file or
several files and concatenate this chunks to one file. So
this

>> mencoder -oac copy -ovc copy -ss $time1 -endpos
$len1 -o fifo patch.avi;
>> mencoder -oac copy -ovc copy -ss $time2 -endpos
$len2 -o fifo patch.avi;

can be done in one step.

I found in the man page: 

"mencoder [options] file1 [specific options] [file2]
[specific options]"

I tried like this:

mencoder -oac copy -ovc copy patch.avi -ss $time1 -endpos
$len1 patch.avi -ss
$time2 -endpos $len2 -o test.avi

and it does work!

I even tried if it is possible to write several files using
several "-o file"
arguments, but mencoder uses only the last "-o".
:-( Fortunatelly this is not too
serious problem... 

Then I tried to write to the fifo, but the reading part
failed:

mknod fifo p
mencoder ... vpass=1 ... -o xTest.avi fifo&
| 
but it fails stating that mencoder is not able to open the
specified file/device
(error message: "cannot open file/device").

I tried to use 

mencoder ... vpass=1 ... -o xTest.avi - >fifo&

or even the not so nice

cat fifo|mencoder ... vpass=1 ... -o xTest.avi -&

I this case mencoder sais that it can not specify the file
type and fails...

Does anybody knows why mencoder can not handle fifo file? Is
it the problem of
cygwin? I read a specific doc about the difference of NT
named pipes and UN*X
fifos. Maybe this is not implemented.

If I get home I'll try to use a normal pipe like this:

mencoder -oac copy -ovc copy -really-quiet patch.avi
 -ss $time1 -endpos $len1 patch.avi -ss $time2 -endpos $len2
-o - |
 mencoder ... vpass=1 ... -o xTest.avi -

I hope this will work!

Thanx again!

Good byte!

TT
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