[FFmpeg-trac] #986(avutil:new): windows named pipe seek
FFmpeg
trac at avcodec.org
Wed Feb 8 16:08:50 CET 2012
#986: windows named pipe seek
-------------------------------------+-------------------------------------
Reporter: setosha | Owner: michael
Type: defect | Status: new
Priority: normal | Component: avutil
Version: | Keywords: windows
unspecified | named pipe seek
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
-------------------------------------+-------------------------------------
I trying to use ffmpeg as fast video codec under windows. But windows
standard input is very slow. So I switched to named pipes. It's up to 10x
faster then standart input (pipe:). Don't ask me why...
Using windows [http://msdn.microsoft.com/en-
us/library/windows/desktop/aa365780(v=vs.85).aspx named pipes] its
possible to crate pipe with [http://msdn.microsoft.com/en-
us/library/windows/desktop/aa365150(v=vs.85).aspx CreateNamedPipe] in
server side. Then using [http://msdn.microsoft.com/en-
us/library/windows/desktop/aa363858(v=vs.85).aspx CreateFile] in client
side open pipe exactly as usual file.
So it's works just fine
{{{ffmpeg -y -vcodec rawvideo -f rawvideo -pix_fmt rgb32 -r 60 -s 800x600
-i \\.\pipe\pipename out.mkv}}}
But when I try to use it like this
{{{ffmpeg -i \\.\pipe\pipename out.mkv}}}
on some input formats ffmpeg says about bad input. Same binary stream
transfered as
{{{ffmpeg -i pipe: out.mkv}}}
works just fine (not so fast, but works). Seems ffmpeg trying to seek, but
fails.
Is it possible to disable file seeking?
You can use file name to check pipe it or not {{{\\.\pipe\*}}}
Or use [http://msdn.microsoft.com/en-
us/library/windows/desktop/aa364960(v=vs.85).aspx GetFileType] function.
Or test file seeking abilities with [http://msdn.microsoft.com/en-
us/library/windows/desktop/aa365542(v=vs.85).aspx SetFilePointer]
Or just add command line argument -noseek or something
Or somthing like {{{pipe:\\.\pipe\pipename}}} (now not working now) or
like {{{pipe:pipename}}} (not working too)
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/986>
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