[gstreamer-bugs] [Bug 556648] New: [decodebin] jpegdec fails to decode ljpeg

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: HEAD CVS
           Summary: [decodebin] jpegdec fails to decode ljpeg
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Hi,

Using playbin or decodebin on an avi file (for example) containing encoded
video with ljpeg, the playbin prefers jpegdec than ffdec_mjpeg and it fails.

I do not know if jpegdec can or cannot decode ljpeg in abosulte way but:

gst-launch-0.10 videotestsrc ! ffenc_ljpeg ! jpegdec ! fakesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /pipeline0/jpegdec0: Failed to decode JPEG image
Additional debug info:
E:\devel-cvs\src\gst-plugins-good\ext\jpeg\gstjpegdec.c(1043): ??? ():
/pipeline0/jpegdec0:
Error #60: Unsupported JPEG process: SOF type 0x%02x
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
FREEING pipeline ...

whereas this one works:
gst-launch-0.10 videotestsrc ! ffenc_ljpeg ! ffdec_mjpeg ! fakesink

Anyway, if jpegdec never decodes ljpeg it should have something in the caps to
make the link impossible because the media type is "image/jpeg" for both of
them.

For now I do not know if it's but or something else so some clarifications
about that from experts would be apreciated.

(more infos, the 2 followings pipelines work:
gst-launch-0.10 videotestsrc ! ffenc_mjpeg ! jpegdec ! fakesink and
gst-launch-0.10 videotestsrc ! jpegenc ! ffdec_mjpeg ! fakesink )

Sincerely

Julien


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