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Wo steht in einer AVI Datei das Aspect Ratio?

Where is it in an AVI file that aspect ratio?



Frage von ilpfi:
Dezember 2005

For a 16:9 movie, I have DV in 16:9 and 4:3 material. I have decided to cut off the 4:3 material above and below each of 72 rows, and then extrapolate the Height to 576 lines. After studying this forum I would have to have an anamorphic 16:9 DV material. The transformation I have hinbekommen both with Virtual Dub as synonymous with the filters of Tmpgenc 3.x. As a compressor, I have both the Panasonic as synonymous to the Pinnacle DV codec available.

Now it is so that the Windows Media Player, the material easy to interpret as the (crushed) 4:3 material, while for the "true" 16:9 material of my Camera "16:9 display, 4:3 actually" prints And the Picture synonymous auseinanderzieht correctly.

When I cut in Premiere 6, I can then force the 16:9 Interpretation and after one export MPG2 then everything is forgiven and forgotten.

Yet, where is actually stored in the AVI file information such as the material is to be interpreted? What I had in Virtual Dub or TMPGEnc otherwise have to do? Are there any DV codec, which you can give to the interpretation as a parameter? Just as this must be synonymous to tell each MPG encoder?

Thanks and greetings
Thomas



Antwort von Stefan:

In the "true" 16:9 material is recorded in compressed DV frame in s.verschiedenen positions of the data area that it is 16:9 material.

You may make a request of Mediaplyer First s.den DV Decoder and ask for the same flag or the "real" image size.

The MP receives the flag equivalent 16:9 or a 16:9 picture size, then the MP rejects the info on the buckling picture size, which is in the AVI file s.Anfang available. If not, do not stop ...

Now the question would be how you reinbekommst the 16:9 flag in the self-made pictures ... a really good solution because I do not know.

Try it with a 16:9 Project of AP? A safe 16:9, DV frame as the first "black" frame mount? A modern DV codec search, where you can set the flag? On the first replay Sclive 16:9 to Camera and then repeat?

BTW. which makes the Panasonic DV codec from your true 16:9 material when it is changed and new needs to be compressed?

Good luck
The fat Stefan



Antwort von ilpfi:

My previous knowledge is:

- The 16:9 information is not available in a header, but the data stream. Reason: Combining any two anamorphic DV clips, of which recognizes one as 16:9 and the other as 4:3 in the Premiere timeline and exortiert everything to DV AVI, turns the media player just s.der body back.

- Some leave a DV codec when you export the flag (for example, the Concept of Media, which is probably the premiere in my version (6.0) here)

- Some media players handle the 16:9 information at all, and always show the bulged version. Others leave a manual forced display in one direction or another

- All major codecs for exports to MPG2 or 4 target formats so do not cause trouble, as that you can set a 16:9 info as ticks.

- Modify A utility or Tweak to) the 16:9 information (without recompression I have not found on the Internet.

Greeting
Thomas








Antwort von Markus:

Hello Thomas,

if you get into premier a 16:9 Project want to spend as such, then sit in the export setting under video filters, new in the box to compress "a hook. Are the project settings, all on a widescreen (D1 / DV PAL Widescreen 16:9 (1.422)), then even a true 4:3-Picture breitgezogenes output as 16:9. ;-)

A better solution, Adobe After Effects: Here I can mix it 16:9 and 4:3, 4:3 simply that black (or otherwise shaped) bar on the left and right, receives, while 16:9 fills the entire picture.



Antwort von ilpfi:

Hi Mark,

Thanks! Everything perfectly so.

Greeting
Thomas




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