openshot.developers team mailing list archive

[Daniel Ellis <mail@xxxxxxxxxxxxxx>]

If your camcorder is PAL, then you may be seeing the same issue that I
had.  I was going to raise a bug for it, but after investigation it
seems that the output that you see is actually expected.  Sounds odd I
know, but let me try to explain.  Please note that my understanding may
be incorrect.

Traditional TV signals are interlaced, the two main encodings are NTSC
and PAL.  One key difference is that NTSC is encoded using upper field
first (UFF) and PAL is encoded using lower field first (LFF).  If you
look carefully at the output of your camcorder, you may see that the
lines are actually reversed.  The camera is recording the lower field
first, but the computer then plays the file back using upper field
first.

I have yet to determine if there is a bug with applications such as
mplayer or totem, they all play back the same way.  My guess is that a
recorded file such as mpeg may not contain the appropriate meta-data in
order for the computer to know which way to play back the file.

However, the files that I have encoded all played back correctly when I
played them back on my PAL television.  I also found that it was
possible to get mplayer to reverse the field order when playing back on
the computer.  I will see if I can find the command and post it here.

Going forward, I am not sure if there is a bug relating to OpenShot for
this issue.  I am also wondering if there is a bug with the various
media players on Linux.  If so I would like to raise the bugs, but as
yet I don't know enough about the issue to know where to raise them.

If the media containers do not contain the appropriate meta data for the
field order, then maybe applications should all contain an option to
switch the field order on playback.  OpenShot also shows the preview
with the incorrect field order, so maybe an option could be added to
OpenShot for the preview window?

-- 
Deinterlacing doesn't work
https://bugs.launchpad.net/bugs/508334
You received this bug notification because you are a member of OpenShot
Developers, which is subscribed to OpenShot Video Editor.

Status in OpenShot Video Editor: New

Bug description:
Deinterlacing doesn't seem to do anything, neither in the preview nor when the video is exported.   I tried all methods.  mplayer -vf pp=fd with the same video works fine.

I'm using OpenShot 1.0.0 on Ubuntu 9.10 and an MPG file created by a Sony handycam.

Sample MPG video:
http://home.umonkey.net/public/openshot/sample.MPG (0.9M)

This video with linear blend deinterlacing applied:
http://home.umonkey.net/public/openshot/sample.ogg (777K)

Not sure what additional information would be helpful, but I'd like to provide it.