No Auto-DVD

The whole "Auto" menu has been revamped in Avidemux 2.5

Instead of a few hardcoded presets, the "Auto" wizards are now scripted. Look in the "scripts\auto" folder.
This allows people to easily make their own wizards and share them with the community.

As you have noticed, a "DVD" wizard is still missing at the moment...

Yep. Something like http://avidemux.org/admForum/viewtopic. … 729#p34729

So there is no way to create a DVD until someone creates a script for that purpose and shares it. I happen to be a programmer, and I'll tell you that the only people who could create such a script "easily" are those have been involved with Avidemux development. I have read the scripting tutorial and compared Microsoft Zune.js with Sony PlayStation Portable.js. I'm guessing that a script to create a DVD would call app.setContainer("DVD") or something like that. But no help for videoAutoWizard() is given by the tutorial and I don't understand exactly what its parameters mean. Given that each failed attempt at creating a correct script takes an hour to create an MPEG from an AVI and may waste a DVD-R attempting to see if the MPEG can actually be authored into a DVD that works in a DVD player, I would expect to spend several days writing and debugging the script. Does anybody happen to have a script to create a DVD from an AVI?

Hello ,

I also came acrosss the missing auto->DVD  script. Its hard to believe that in 2.5 there is no script that allows you to find the correct DVD settings whereas in 2.4 there was already help available.

Is there such a script available somewhere in between? 

I think if its as easy as described above there should be one by now?  Or is the only solution to go back to 2.4 or use another encoding software like devede or similar?

Thanks
Rainer

Hmm, it seems your script won't even resize the video, if the resolution is neither 720x576 nor 720x480.

So this won't give Video-DVD compliant output, if the source isn't already in PAL or NTSC resolution!

Hello DarkZell666,

I used your script to transcode a DVB-S recording to DVD format. It worked with no problems. Thank you very much for your script!

Have a nice day
Rainer

You really shouldn't blindly insert a deinterlace filter!

Applying a deinterlacer on progressive content destroys quality for no benefit.

Also if I wanted to burn interlaced content on a Video-DVD, I'd prefer creating an interlaced DVD for fluid motion

But if you really want to deinterlace, YADIF will give much better quality than libavcodec deinterlacer.

Why not use Lanczos method? It preserves much more detail.

Hmm. too bad.

I think Xvid rate control was added to the MPEG-2 encoder, because the original RC often failed to hit the target size.

Last edited by LoRd_MuldeR (2009-08-10 22:52:11)

Slightly blurry? IMO you loose a whole lot of quality when "deinterlacing" a progressive source, especially with a "dumb" deinterlacer, such as libavcodec's "linear blend".

Also interlaced DVD's aren't unusual, even some "original" discs are interlaced...

Does it? If at all, you need to set the field order. But I think this has no significant effect as long as we aren't using Yadif in "Bob" mode. And we certainly won't use "Bob" mode here, since Video-DVD can't handle 50 fps progressive frames.

Well, some rining is the price for detail retention, and I think it's worth the trade-off in case of Lanczos3.

Spline36 may perform even better than Lanczos, but isn't exposed in Avidemux...

Yes. We could simply use the "Convert FPS" filter to convert the fps while keeping the duration (audio in sync). Unfortunately it produces jerky motion. So I prefer to simply speed-up/slow-down the FPS and then resample the audio to fix the sync. As long as the difference in FPS isn't too huge, this works perfectly fine (TV stations do the same).

Yes. I think the old "built-in" Auto DVD wizard did do that.

Sure. But you also sacrifice a lot of quality. People may complain that Avidemux produces less quality DVD's than other tools.

So these are just suggestions to make script even better...

Last edited by LoRd_MuldeR (2009-08-11 11:21:36)

Well, after a couple headaches, here's my first attempt at an actual Auto DVD wizard.

This is only half-tested, and I needed to duplicate the code from filters.js just for the sake of using lanczos3
It somewhat works. The thing that isn't dealt with AT ALL is de-interlacing, since there's no way to detect if a source is interlaced or not via scripting. I hesitate to add yet another drop-down box in there. If I did, I suppose it would have to have three options :
- Deinterlace + Encode progressive
- Encode progressive (no de-interlacing)
- Encode interlaced

Copy/paste in a file named DVD.js, and place it in <avidemux_install_directory>/scripts/auto to use it.

//AD
include("video/autoWizard.js");
include("video/functions.js");

//
// Auto DVD Wizard v1.0 contributed by DarkZell666
// http://avidemux.org/admForum/viewtopic.php?id=6278
//
var app = new Avidemux();

if (app.video == null)
    displayError("A video file must be open to use this Auto Wizard.");
else
{
    var result = videoAutoWizard("DVD Auto Wizard", [[720, 480], [720, 576]]);

    if (result)
    {
        var targetX = result[0][0];
        var targetY = result[0][1];
        var sourceRatio = result[1][0] + ":" + result[1][1];
        var destinationRatio = result[2][0] + ":" + result[2][1];

        _resizeAndFillVideo(targetX, targetY, sourceRatio, destinationRatio);

        var ratio169="00"; // 4:3 by default for DVD (lavc) encoder, 16:9 if specified.
        if (destinationRatio == "16:9")
            ratio169="01";
        
        var lastFilter = app.video.appliedFilters[app.video.appliedFilters.length - 1];
        
        if (targetY == 480 || getColourEncodingSystem(lastFilter.fps1000) != "NTSC")
            app.video.addFilter("resamplefps","newfps=30000","use_linear=0");
        else if (targetY == 576) {
            if (getColourEncodingSystem(lastFilter.fps1000) == "FILM") {
                app.audio.film2pal=true;
            } else if (getColourEncodingSystem(lastFilter.fps1000) != "PAL") {
                app.video.addFilter("resamplefps","newfps=25000","use_linear=0");
            }
        }
        
        app.video.codec("XDVD", "2PASS=4000", "160 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 1f 00 00 00 03 00 00 00 02 00 00 00 01 00 00 00 01 00 00 00 fe ff ff ff 01 00 00 00 fb ff ff ff cd cc 4c 3d 01 00 00 00 0a d7 23 3c 01 00 00 00 00 00 00 3f 00 00 00 3f 00 00 00 00 40 1f 00 00 00 00 00 00 0c 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 "+ratio169+" 00 00 00 02 00 00 00 40 1f 00 00 00 00 00 00 00 00 00 3f 00 00 00 00 00 00 00 3f 00 00 00 00 00 00 00 00 e0 00 00 00 00 00 00 00 00 00 00 00 ");
        
        if (app.audio.targetTrackInfo.length > 0)
        {
            if (app.audio.targetTrackInfo[0].codec != "AC3" || app.audio.targetTrackInfo[0].channelCount != 2 || app.audio.targetTrackInfo[0].frequency != 48000)
            {
                app.audio.codec("Aften",160,8,"a0 00 00 00 00 00 00 00 ");
                app.audio.resample = 48000;
                if (app.audio.targetTrackInfo[0].channelCount == 2)
                    app.audio.mixer = "NONE";
                else
                    app.audio.mixer = "STEREO";
            }
        }

        app.setContainer("PS");
    }
}




// Modded version with lanczos3 resize instead of bilinear
function _resizeAndFillVideo(targetX, targetY, sourceRatio, destinationRatio)
{
    var app = new Avidemux();
    var filters = app.video.appliedFilters;
    var width, height, fps1000;

    if (filters.length > 0)
    {
        var lastFilter = app.video.appliedFilters[filters.length - 1];

        width = lastFilter.width;
        height = lastFilter.height;
        fps1000 = lastFilter.fps1000;
    }
    else
    {
        width = app.video.width;
        height = app.video.height;
        fps1000 = app.video.fps1000;
    }

    // Resizing
    var scaledWidth = rescaleVideoDimension(width, sourceRatio, destinationRatio, getColourEncodingSystem(fps1000));
    var rX = scaledWidth / targetX;
    var rY = height / targetY;
    var newX;
    var newY;

    if (rX > rY)
    {
        // resize by X
        newX = targetX;
        newY = Math.round(height / rX);
    }
    else
    {
        // resize by Y
        newY = targetY;
        newX = Math.round(scaledWidth / rY);
    }

    // resize to multiple of 4
    newX -= newX % 4;
    newY -= newY % 4;

    if (newX != width || newY != height)
        app.video.addFilter("mpresize", "w=" + newX, "h=" + newY, "algo=2");

    // Black bars
    var barX = targetX - newX;
    var barY = targetY - newY;

    if (barX || barY)
        app.video.addFilter("addblack", "left=" + (barX >> 1), "right=" + (barX >> 1), "top=" + (barY >> 1), "bottom=" + (barY >> 1));
}

Comments/suggestions welcome

The wizard relies on rescaleVideoDimension (via getPixelAspectRatio) method in video/functions.js, which seemed to already take care of that. Could you detail a bit further ?