[gstreamer-bugs] [Bug 568555] New: Interlaced MJPEG files not handled correctly by jpegdec
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Wed Jan 21 06:53:49 PST 2009
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GStreamer | gst-plugins-good | Ver: git
Summary: Interlaced MJPEG files not handled correctly by jpegdec
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: thaytan at mad.scientist.com
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME version: Unspecified
GNOME milestone: Unspecified
For example: http://gstreamer.freedesktop.org/media/incoming/douche.MJPEG-A.mov
With this kind of file, each packet from qtdemux contains 2 sequential jpeg
images, one per field.
jpegdec detects that it is running in 'packetised' mode, and only decodes the
first jpeg image in each packet, resulting in half-height output of online the
first field. It needs to allocate a buffer twice the height and then decode
each field into that buffer.
I'm not sure what happens with the sub-sampled chroma planes in this case. I
guess each field contains a subsampled version of that field only.
ffdec_mjpeg correctly decodes both jpeg images in the packet, and outputs a
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