Elisa doesn't decode interlaced videos properly

[m0sia]

I have a lot of interlaced mpeg2 videos. It would be great, if elisa apply deinterlacing filter above such files.

[Olivier Tilloy (osomon)]

Elisa uses gstreamer's playbin to reproduce media. So I guess the issue is in playbin itself that doesn't add the deinterlacer element to the pipeline when needed.

Can you run the following command and attach the output:

    gst-inspect | grep deinterlace

Does playing the file with totem-gstreamer deinterlace it?

[m0sia (m0sia)]

$ gst-inspect | grep deinterlace
ffmpeg: ffdeinterlace: FFMPEG Deinterlace element
gstinterlace: deinterlace: Deinterlace
deinterlace2: deinterlace2: Deinterlacer

totem-gstreamer doesn't deinterlace it. I googled and found bug report that gstreamer playbin doesn't attach deinterlace filters in pipeline. https://bugs.launchpad.net/ubuntu/+source/gstreamer0.10/+bug/257818 And until now bug in gstreamer exist and still not fixed.

So this problem is not elisa trouble.

It's a pity, because i have a lot of video from my camcorder, that is interlaced. And i am using mostly elisa for my home theater pc.

[Olivier Tilloy (osomon)]

Setting the status to confirmed. But as we are using playbin in Elisa, there is no chance this will be fixed until playbin itself is fixed.

[Jonathan Rauprich (joni-noplu)]

In the next version of gstreamer this is likely fixed, see: https://bugzilla.gnome.org/show_bug.cgi?id=547603
However this can be fixed with the current playbin too. The solution is using a Gst.Bin with a Gst.Ghostpad instead of the current video-sink.

The Bin could look like this ffdeinterlace -> pgmsink but i got better results with the following Bin: ffmpegcolorspace -> deinterlace -> ffmpegcolorspace -> video-sink

The deinterlace element can automatic detect if a stream is interlaced or not, however i din't know how well that is working.

[Jonathan Rauprich (joni-noplu)]

I've made a branch for it: https://code.launchpad.net/~joni-noplu/elisa/deinterlacing_support
This adds a option deinterlace to the PlayableModel, when its True, the video will be deinterlaced.

That helps for my DVB plugin, but if u watch interlaced streams from other sources (like the bug
opener) that dosn't help. Maybe add a button to the player do enable/disable deinterlacing.

Next Gstreamer versions, have deinterlace in playbin2 (see: https://bugzilla.gnome.org/show_bug.cgi?id=547603)
 that makes the code shorter, but the issue to turn it on/off still is there.

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