[gst-devel] Seek in a filesink

[sebbil at gmx.de]

Thanks for your reply! I'll just try to implement it the way you described!

Sebastian

> The function returns False to indicate that the seek fails. The reason
> it fails is because filesink knows nothing about the data it is
> storing and does not know how to use FORMAT_TIME. If you perform a
> seekon the filesink with FORMAT_BYTES it should succeed, however you
> will more than likely get a slightly corrupt file unless you know the
> location in bytes of all the audio frames and managed not to cut one
> of them in half. As well, you will probably have problems with the
> timestamps in the file being inconsistent.
> 
> I don't know of another way to do it with GStreamer but if you plan on
> doing it this way I would suggest you try wavenc since with the WAV
> format you can easily convert seconds to the position in bytes using
> the sample rate and bit width.
> 
> Laszlo
> 
> On Wed, Jun 24, 2009 at 4:42 AM, <sebbil at gmx.de> wrote:
> > Hi there!
> >
> > I'm currently writing an application in the style of an old-fashioned
> dictaphone. Basically, the application uses a filesink to write recorded data
> to a file.
> >
> > The application should have a button for "rewinding the tape" and
> anotherone for fast-forwarding it. After pressing the "record"-button, the
> application should start recording from the new position.
> >
> > Here is a little example:
> >
> > The app recorded the following:
> >
> > time: 1       2       3       4       5
> > data: bla bla bla bla bla bla foo foo foo foo
> >
> > The user rewinds 3 seconds and goes on recording "bar":
> >
> > time: 1       2       3       4       5
> > data: bla bla bla bla bar bar bar bar bar bar
> >
> > => It overwrites the previous recorded stuff.
> >
> > I tried to do so by using gst.Element.seek_simple, but it returns
> False...
> >
> > Here is the relevant code:
> >
> > The pipeline: "pulsesrc ! audioconvert ! vorbisenc ! oggmux ! filesink
> location=/tmp/test.ogg"
> >
> > The seeking stuff:
> self.pipeline.get_by_name('filesink0').seek_simple(gst.FORMAT_TIME, gst.SEEK_TYPE_SET, 3000)
> >
> > Thanks in advance!
> > Sebastian Billaudelle
> > --
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> >
> >
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