[MEncoder-users] Xvid bff/tff field order issue

[Dr.O.Muth at habmalnefrage.de]

Am Dienstag, den 15.02.2011, 20:48 +0100 schrieb Moritz Barsnick:
On Sat, Feb 12, 2011 at 15:08:16 +0100, Dr.O.Muth at habmalnefrage.de wrote:
> I have a classic "SD" interlaced CRT TV set. I fed these files to my
> (HD capable) HDD receiver's media player, which I assume can output
> interlaced content as interlaced on the SD baseband output. And indeed,
> the original file looks fine, both AVIs look very jumpy.

Thank you!
At least my dvd-player is Ok then.

But this means that mencoder - with or without patch - is simply not capable of encoding interlaced PAL source files with the xvid codec??
That's a shame!

Especially since my dvd-player rejects libav encoded mpeg4. I have not yet figured out why...

> While deinterlacing seems to be recommended by every one, 
Well, some do some don't. 
In this old thread http://lists.mplayerhq.hu/pipermail/mencoder-users/2007-October/007217.html
you seem to be on the "don't deinterlace" side yourself. ;-)
So was Reimar: http://lists.mplayerhq.hu/pipermail/mencoder-users/2007-September/007023.html

Maybe this is just like: If you are interested enough in video encoding to volunteer to write encoding software, then you are interested enough to buy yourself a fancy big ultra HD plasma TV and just don't care about interlaced content. ;-)

However, if all your sources are interlaced and all your hardware (only) supports interlaced content, then I don't see the point in wasting processing power and time on a deinterlacing filter. 
Only to get fewer pictures per second...?


Off topic:

> I also want to do some analog captures to disk, and burn them to DVD
> while keeping them interlaced. Alas, I have yet to find the absolutely
> correct capture and conversion settings for mencoder and ffmpeg. :)
The main reason why I bought a capture card was to "secure" my VHS collection.
So far the best solution I found was to capture losslessly as ffv1 in a matroska container, like in this profile:
[VHS-roh]
profile-desc="capture losslessly from VHS"
tv=driver=v4l2:normid=5:quality=0:width=768:height=576:fps=25:freq=601.125:alsa=1:adevice=hw.1:amode=1:forceaudio=1:immediatemode=0:audiorate=48000
oac=lavc=yes
ovc=lavc=yes
lavcopts=vcodec=ffv1:acodec=ac3:abitrate=192:threads=2
of=lavf=yes
lavfopts=format=matroska
srate=48000
ofps=25
vf=harddup=1
noskip=1
endpos=1:31:00

This allows for 2-pass encoding or experimenting with filters, without having to re-play an ageing tape on an ageing player again and again.

Videos I'll probably only watch on a computer I encode as x264/matroska.
For a DVD with a nice menu I scale to 352x576 interlaced, playable on any DVD-player.
I feel that this is enough resolution for an old low quality VHS (which is not 720x576 anyway).
mencoder -oac copy -ovc lavc -lavcopts \ vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=8500:ilme=1:ildct=1:keyint=15:vstrict=0:trell=1:mbd=2:autoaspect=1:threads=2:psnr=1 .....\ 
-vf crop=704:576:8:0,il=d,hqdn3d=2:1:2,il=i,scale=352:576:1
...

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