[gstreamer-bugs] [Bug 578966] New: Using seek to segment video produces garbage

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: 0.10.21
           Summary: Using seek to segment video produces garbage
           Product: GStreamer
           Version: 0.10.21
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: shawn_mcmurdo at yahoo.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.23/2.24
   GNOME milestone: Unspecified


Please describe the problem:
I am trying to segment a video using gstreamer (via gstreamer-java).
I have the equivalent of this pipeline:

filesrc location=${input} ! decodebin name=dec ffmux_asf name=mux ! filesink
location=${output} dec. ! queue ! ffmpegcolorspace ! ffenc_wmv2 ! queue ! mux.
dec. ! queue ! audioconvert ! lame ! mp3parse ! queue ! mux.

This pipeline works if I don't do a seek but if I do a seek it produces a file
that is not identifiable as a video although it seems to be about the right
size.

Here's the seek code which works on other pipelines:

int flags = SeekFlags.FLUSH | SeekFlags.SEGMENT | SeekFlags.KEY_UNIT;
boolean success = gpipe.seek(1.0, Format.TIME, flags,
                                    SeekType.SET, startClock.toNanos(),
                                    SeekType.SET, endClock.toNanos());


Steps to reproduce:
1. I am trying to segment a video using gstreamer (via gstreamer-java).
I have the equivalent of this pipeline:

filesrc location=${input} ! decodebin name=dec ffmux_asf name=mux ! filesink
location=${output} dec. ! queue ! ffmpegcolorspace ! ffenc_wmv2 ! queue ! mux.
dec. ! queue ! audioconvert ! lame ! mp3parse ! queue ! mux.

This pipeline works if I don't do a seek but if I do a seek it produces a file
that is not identifiable as a video although it seems to be about the right
size.

Here's the seek code which works on other pipelines:

int flags = SeekFlags.FLUSH | SeekFlags.SEGMENT | SeekFlags.KEY_UNIT;
boolean success = gpipe.seek(1.0, Format.TIME, flags,
                                    SeekType.SET, startClock.toNanos(),        
                         SeekType.SET, endClock.toNanos());

2. This produces an output file that is not recognizable or playable via
gstreamer or other video players.
3. 


Actual results:
An output file of approximately the correct size is generated but it is
unplayable.

Expected results:
I expect the generated video segment to be playable.

Does this happen every time?
yes

Other information:
This happens on Fedora 10 64 bit and Ubuntu 8.10 32 bit.


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