Interlaces video and resizing

[cd090580]

Hi have a dvd with music videos and I want to convert one video to a divx (avi) file.

The DVD is PAL 720*576 interlaced (dvd2avi tells it's interlaced and I can see the combing effect).

My target file is a divx file with a resolution of 384*288 and mp3 audio.

So Do I need to deinterlace before resizing or simply select even od odd field is enough and then only resize the width ?

Or simply resize the video without any deinterlace ?

Thanks.

[drewzor]

if its final destination is for play back on a television then keep it interlaced, however you said you are going to encode into divx so I'm guessing your keeping it for playback on pc. In that case you should de-interlace it.

De-interlace it first then resize

keep in mind that 720x576 can display a different aspect.. you may need to resize to 512x288 not 384x288

Check it with gspot and check the DAR to see if its 4:3 or 16:9

[cd090580]

My videos are 4:3 and if they are 16:9 I letterbox them to 4:3

and I encode them to divx to play on a portable multimedia player

Will it be faster to use virtualdub or avisynth to do the resize/deinterlace ?

[drewzor]

avisynth would be slightly faster but I just use the filters in VDM or even AutoGK.. VirtualDubmod is my preference tho

Its more the codec and bitrate that will slow down the encoding time.

[cd090580]

Ok Thanks.

The codec is DivX 6.2.5 at a bitrate of 800 kbps and audio 128 kbps and 1 pass only.

to make the encoding even faster, can I use the deinterlace filter of vdub and select discard one field option ?

[manono]

Hi-

AviSynth is always faster, by about 30% in your case. AviSynth produces better quality, although at that resolution and your 1-pass encoding method, I don't guess you're too concerned about quality.

Since your final height is half the source height, it's perfectly OK to throw out one of the fields as a way to deinterlace.

[cd090580]

OK Thanks a lot