[gstreamer-bugs] [Bug 500258] Buffer is not writable in do_transform_ip in gst.BaseTransform with passthrough=False and in_place=True

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-python | Ver: 0.10.9

Stefan Wehner changed:

           What    |Removed                     |Added
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                 CC|                            |stefan.wehner at gmail.com




------- Comment #2 from Stefan Wehner  2008-01-18 10:01 UTC -------
Carlos and I tracked this bug down to
gstbasetransform.c:gst_base_transform_prepare_output_buffer. 
For a writable input buffer with different caps, a new subbuffer is created (to
replace the caps), rendering the buffer readonly.

Changing the behaviour of subbuffers and making them writable is probably a
pretty radical change, and we don't have the sufficient knowledge about
gstreamer to change that, so I think we're left with two options:

 1) Replace the caps directly on the in buffer and pass it on
 2) Copy the in buffer, and repalce the caps on the copy

If it's be possible I'd go with 1) as it'd be more efficient.
In case anyone thinks/knows that this is not a good idea, and a copy should be
made instead, let us know.

I'll attach a proposed patch to the latest stable version.


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