mencoder, telecine, deinterlace, and audio sync

[gondoi]

Hi, I'm trying to encode The End of Evangelion, and I'm having some troubles.

I figured out it was interlaced, that was easy. But when i tried the deinterlacing options they all looked bad. ( the best one was median deinterlace, but it was still bad ) I started reading up on interlacing, and i found a few people who feel that deinterlacing is just bad in general, and that it should be played with the inverse interlace or something.. can't remember the exact wordings. Anyway, I figured out that I can play the movie with this comand

[commanderfoxtrot]

It sounds as if you are not properly converting DVD audio (48KHz) to "normal" audio (44KHz), but just coping the samples. You need to look at the mplayer/mencoder man page under resampling filters.

[gondoi]

I'll look at the Docs but I'll go ahead and post what i'm doing.
Let me know if you need to know more.

[gondoi]

With more tests I have noticed that even regular movies are off a bit.. just barely though. Maybe half a second or so.

I tried resampling to 44KHz, but that didn't help. Does anyone know what could be causing my audio to be out of sync with my video?

[Tuna]

i dont know much about mencoder and inverse telecine (IVTC). but as far as is know its a pulldown technique that 'removes' some duplicated frames, that have been added to reach NTSC specs (30fps per second with displaying 60 half pictures each second). ok.. there are a lot of good sites out there that try to tell you what all this stuff means, but to summarize.. IVTC normally pulls down your movie from 29.97 fps to 23.97 fps, which is quite good to our normal film specs (24fps). but sice your still 29.97 fps.. maybe A/V sync suffers from that? or from that leftover 0.03 fps after pulldown? unfortunately i dont have eva dvds - i dont have ny anime dvds :/ but i like to know about your experiences and hopefully successful encodes.. maybe extract the audio.. encode the video.. and check both files playtime.. maybe the riddle's secret is kept there.

[Klepper]

It's a bit more complicated and I haven't come up with a working solution either. Audio and Video never sync, although it's only about 1-2 secs for the whole movie.

When you give a different framerate with -ofps mencoder keeps all the frames and just speeds up and slows down the movie. This applies for audio too.
When using -detc mencoder cuts out the duplicate frames and changes the framerate without changing the speed.
The right setting for detelecine is -vop detc=dr=1 -ofps 23.976 (also try switching -fps 29.97). But this will slow down the audio by factor 30/24 as nothing is cut out there.

So you'll have to encode audio and video seperately.
i.e. encoding the audio at normal framerate to keep normal speed and encoding the video with detelecine, as detelecine keeps the original speed automatically (by cutting out frames)

[gondoi]

Just an update here... I've been searching the Mplayer-user lists.. and it seems that a few people have submitted this as a bug. From what I've found so far, there wasn't a problem before, but since some release (not sure which one) the encoding of dvds has become out of sync. I have not found anything in the lists (yet) about a fix either. When/if I find something, I'll update this thread.

gondoi

[phypor]

[gondoi]

In that case, does anyone know where I could get a _rc3 ebuild?? The lowest I have in my mplayer directory is _rc4. I will go ahead and try that one and see if that version is early enough to work, but I figure that it may not knowing my luck .
Anyway, If it doesn't work, and nobody knows where to get the ebuild I'll just have to try and find the source and compile it that way.

Thanks for the info.

[gondoi]

Alright, this is about to drive me crazy...
I've downloaded the old _rc3 release, with no luck.
I still has the same delay. I found a post on the user list that says something about the 2003 01 16 cvs release was when someone noticed it. So I'm probably going to try that version and then the one for the 15th. Hopefully, I can find a version that has a good a/v sync.

Perhaps I'll even try the latest cvs... but we'll see. it's late for now, I'll have to try it tomorrow.

[Tuna]

ok its me again. luckily i got my first ntsc dvd into my hands. ok its not anime but nearly as cool: brazil criterion collection. wohoo!

anyway curious about that stupid ntsc and ivtc technique i though i give it a try, and here are my results:

[gondoi]

Hmmm.. maybe that means it is the LAME that causing the problem.. not sure. Maybe I'll try the ogg when I get a chance (I prefer ogg anyway, have my music encoded with it).

BTW, what needs to be merged to have oggenc and oggmerge? I have 'oggvorbis' and 'encode' both in my USE variable.. but I don't seem to have those programs anywhere.

Thanks,
gondoi

[Tuna]

hm.. i would wonder if it would be LAME's fault.. only FHG under windows was buggy in that behaviuor afaik. maybe the problem accurs when you dont encode video and audio at the same time. so that audio chunks wont fit in the stream anymore and have to be relocated. if your still having trouble ask the mplayer guys.. they normally know what the code

[gondoi]

Ok, Now I've got some weird stuff goin on... good weird stuff though.

Things are working for me now. Strange, but at least things work the way I want them now, at least so far. I am going to do more tests. Unfortunatly, I didn't have all the variables in control so I'm not so sure what has changed. I do know this though. I have emerged dvd::rip and transcode. Mencoder started encoding in sync AFTER emerging those. I'm assuming one has emerged something over something else mencoder uses... not sure.

Anyway, I got the ogm ones working too, I was excited about that, but then I tested the MP3 one more time with lame... and it worked.

So once again, I'm not entirely sure what has changed, but I do know I am using the same options I was using before when it did NOT work.

Anyway, there is that...

[Tuna]

hehe ok.. now send over the NGE DVDs.. pleeaasssee?