[MEncoder-users] Can you feed a named pipe into mencoder?

[David Liontooth]

On 11/11/2010 11:24 PM, Reimar Döffinger wrote:
> On Thu, Nov 11, 2010 at 05:30:28PM -0800, David Liontooth wrote:
>> On 11/11/2010 03:57 PM, Angel wrote:
>>> David Liontooth<lionteeth at cogweb.net>   wrote:
>>>>   cat /dev/dvb/adapter0/dvr0 | tee p1>   p2 | paste p1>   $FIL.mpeg | \
>>>> zvbi-atsc-cc --atsc -T -C $FIL.txt CBS-HD<   p2
>>>>
>>> That seems an awfully complex line ... isn't it equivalent to something like
>>>
>>> cat /dev/dvb/adapter0/dvr0 | tee $FIL.mpeg | zvbi-atsc-cc --atsc -T -C $FIL.txt CBS-HD
>>>
>>> (Just off the top of my head ... but redirecting the output from tee is normally redundant IME, as is using>   or<   in the middle of a pipeline)
>> You're right; the simpler version does exactly the same thing; cool.
>>
>> This also works -- one named pipe is enough, unnamed pipes work
>> great with mencoder:
>>
>> cat /dev/dvb/adapter0/dvr0 | tee p1 | mencoder - -cache 2048 -ovc
>> copy -oac copy -o out.avi&  zvbi-atsc-cc --atsc -T -m -C out.txt
>> CBS-HD<  p1
>>
>>> As far as using mencoder goes, I know of no reason the input can't be a named pipe
>> Now, the named pipe works with mencoder too, but doesn't exit
>> cleanly on Ctrl-c and has to be killed:
>>
>> cat /dev/dvb/adapter0/dvr0 | tee p1 | zvbi-atsc-cc --atsc -T -m -C
>> out.txt CBS-HD&  mencoder p1 -cache 2048 -ovc copy -oac copy -o
>> out.avi
>>
>> All I did was invert the position of mencoder and zvbi-atsc-cc.
>> Looks like a bug?
> I don't think so. I suspect that with your shell mencoder does not
> get a signal with ctrl+c. mencoder should quit as soon as "tee"
> quits though, although there could be some missing EOF checks in
> the MPEG-parsing code.
Thanks. Angel suggested removing the pipe to get a clean exit.