Adobe Media Encoder CS4 resizing

[dedek74]

Hi,

I have a problem in AME CS4 when I want to encode video from my DV Camcoder to any of the .MP4, .FLV or .F4V format. My source is 16:9 video in DV AVI format of 720x576 and par 1.422. When I want to export to some square pixel format, the source is interpreted by AME as 1050x576, which is not 16:9 (correct value for 16:9 should be 1024x576)! When setting output size to 16:9, it results in tiny black bars on top and bottom, which is a little embarrasing. I didn't find a way how to tell AME that the source is 16:9 format. I hadn't this problem in CS3.

Does someone has the same problem?

Thank you for any ideas. I moved this problem here from thread https://forum.videohelp.com/topic370717.html.[/url]

[poisondeathray]

I can confirm this odd behaviour with pal 16:9 dv footage. I have all current updates. The source preview window looks ok, but the output preview window shows tiny letterboxing despite playing with different settings (but according to jagabo's explanation in the other thread, this behaviour is normal).

this is because in a 720x576 frame the 16:9 image is contained in the inner 704x576 pixels. So the full 720x576 frame is slightly wider than 16:9. Same for 4:3.

I think this has to do with the ITU and non-ITU specs that manono was talking about e.g. 65:45 (1.445) vs 16:11 (1.422) for the pixel aspect ratio. Although Premiere can interpret footage (or "conform file"), it doesn't seem to have the ability to do the aspect ratio in such a manner (as far as I can tell)

You can get around this by using avisynth, the premiere avs import plugin (do all your resizing and deinterlacing in avisynth using square pixels, besides, the deinterlacing in adobe is horrible quality drop field). Then import your resized, 1:1 footage into premiere for editing using custom settings.

Or if you have multiple projects from the same footage, leave the DV settings, export your edited project as a lossless format, then do the deinterlacing and resizing 1:1 with avisynth, then use that .avs as input into any encoder (you can use AME as well)

[dedek74]

Thank you, poisondeathray, it sounds as a good solution, avisynth seems to be a usefull tool
I am working on it (avisynth don't want to open my sony DV videos yet).

[poisondeathray]

For DV files, you open them up with AVISource(). You need a vfw DV decoder, such as cedocida installed. FFDshow has one as well, but limits to YV12 colorspace. Cedocida has more configuration options.

AVISource("myvideo.avi")

You can find the Premiere AVS Import plugin on sourceforge
http://videoeditorskit.sourceforge.net/

I would deinterlace and resize within the avs script (I'm assuming your DV is interlaced) e.g.

Load_Stdcall_Plugin("C:\Program Files\AviSynth 2.5\plugins\yadif.dll")
AVISource("myvideo.avi")
Yadif(order=0) #bottom field first
LanczosResize(640,360)

There are many choices for deinterlacers, some are much better (but slower to process) than others. Yadif gives decent quality/speed ratio. e.g. You can use yadifmod+nnedi2 for better quality (but slower). And you can resize to whatever 1:1 pixel dimension (16:9 AR) you want, in this example I used 640x360

Cheers

[Gavino]

For DV files, you open them up with AVISource().

If you're processing the audio inside Avisynth as well, your DV file needs to be Type 2 DV.
For Type 1, AVISource ignores the audio.