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Frage von Brockhaus:
Dezember 2008

Hi,

I want big DV files (from a mini-DV camcorder) to compress mpeg4. For this I use the program "AutoGK (Auto Gordian Knot), which is the degree of compression can be determined, as a" target quality in percentage. " But this is for me a completely abstract, I just do not know what a reasonable compression ratio for my purposes ... Ich mach das mal clearly with an example:

Output file is a 2 GB large, about 10 minutes long DV file (avi). At what size can / should you compress this file to leave the video on the home television to enjoy?

My first attempt with AutoGK showed a 365 MB file, the picture quality is excellent, however, increases the picture and the sound sometimes. If the s.meinem cheap DVD player, or is the file (365 MB for about 10 minutes) simply too big?

Thank you already for your help,
Andreas



Antwort von domain:

Why do you want to compress as ever?
Space is no longer a problem nowadays.



Antwort von B.DeKid:

Also in SUPER XVID example and then choose the XVID codec windows "Home Theater" ... choose that makes you about 10 minutes from 300MB, which should work on any player with DIVX / XVID smooth running function.

MfG

B. DeKid

@ domain

So to watch videos at home s.DVIX / XVID DVD player to watch is the kompremieren via XVID perfect sense.
10min film on standard DVD in MPEG2 mode to burn something on the other hand, I get to be too exaggerated ;-)





Antwort von LarsProgressiv:

Hello Brockhaus,

I recommend to you avidemux
Zweifach-Durchlauf Videogröße
Zielvideogröße = 1MB (ja wirklich!!)
Halbbildmodus (Falls Normal- DV )

Bewegungsgenauigkeit 6
VHQ Modus 4
I-Picture Intervall 1-250
Anzahl of B-Bildern 3
Qpel ja
GMC ja
BVHQ ja
Pixel Seitenverhältnis »wie Input«

Quantization-Typ MPEG
I-Picture Quantisierer 2 - 3
P-Picture Quantisierer 2 - 5 (je nach Kompressionswunsch höher)
B-Picture Quantisierer 2 - 7 (je nach Kompressionswunsch höher - immer höher als bei P-Picture)
Trellis Quantization ja

Bemerkung: höherer Quantisierungsfaktor = kleiner Videodatei

Ich hoffe das hilft.
here avidemux
Zweifach-Durchlauf Videogröße
Zielvideogröße = 1MB (ja wirklich!!)
Halbbildmodus (Falls Normal- DV )

Bewegungsgenauigkeit 6
VHQ Modus 4
I-Picture Intervall 1-250
Anzahl of B-Bildern 3
Qpel ja
GMC ja
BVHQ ja
Pixel Seitenverhältnis »wie Input«

Quantization-Typ MPEG
I-Picture Quantisierer 2 - 3
P-Picture Quantisierer 2 - 5 (je nach Kompressionswunsch höher)
B-Picture Quantisierer 2 - 7 (je nach Kompressionswunsch höher - immer höher als bei P-Picture)
Trellis Quantization ja

Bemerkung: höherer Quantisierungsfaktor = kleiner Videodatei

Ich hoffe das hilft.

The Kompremieren takes a little time, but it's worth it.
As an audio format, I usually Vorbis, I have often synonymous in mono, if the raw material not being made sensible:

Vorbis:
Mode qualitätsbasiert
Quality of 3.75 to 4.5
(more worthwhile for most DV cams really are not, rather less)

Regards
Lars




Antwort von tommyb:

@ LarsProgressiv
So if he actually his shots at the domestic Television wants to see, then he certainly uses a DVD player which is capable of AVI container with MPEG4 playback (umgangssprachlich DivX files).

However, your proposal would be that just the sound in such a player with the highest probability would not be played. An AVI with a compressed OGG Vorbis soundtrack would be the most players of that kind highly incompatible (there is actually the run).

@ Brockhaus
If you want the highest possible quality, then you should use XviD and not with fixed bitrate encoding but rather use the quantizer mode. Then the bit rate depending on the image content.

Thus although you have no control over the file (but should be definitely smaller than the original material), but the quality does not suffer from a possible low bitrate chosen and you must not vorallem rumraten which fits better.

For encoding, I would recommend you the following:

VirtualDub
XviD 1.2.1
MP3 Codec (Radium or similar)

The program can be your VirtualDub DV AVIs directly verwursten. Ie by drag & drop purely throw, then on Video -> Compression and go select the XviD codec.

Then do you in the main window the following:


In "Profile @ Level" You click on "more" and are a:

You can instead choose mpeg h263 synonymous, resulting in a larger file and a sharper picture.

Then in the main window to "zone option and click the Set:


In the main window in "quality preset" on "more" button:


Next to "Quantization":


This would make up almost XviD maximum configured.

Now go to Audio -> Full Processing. After you click on "Compression" and select mp3 from there. Attention, it will possibly two times mp3 occur. You choose the mp3 please, where the bitrate to 192kbit / s can be set!

If this is done only on File -> Save and render leave. Done.

If the material is on your player jerky, there are a few reasons why:

1. He can not play non-Interlaced Material (very likely), then you need to deinterlace it before it is encoded.

2. It is "Packeted Bitstream" in the activated B-VOPs. This SHOULD NOT be activated because it is for most chips Jerkiness leads.



Antwort von Brockhaus:

First many thanks for your answers!

"domain" wrote:
Why do you want to compress as ever?
Space is no longer a problem nowadays.


Mal ganz blöd asked: What would be the alternative?

I am so not about the Compression s.sich, rather, it somehow captured videos with the DVD player to play. The quality must obviously somewhat agree (I am not overly demanding). My attempts with SVCD (created with Nero) were in this respect, however, not satisfactory.
Previously, I have finished my cut DV video tape simply back up on plays and archived. The quality was super, but the handling is too cumbersome.
My DVD Burners, I have in this respect has never been used. For one, because it is usually only a short video snippets, which are to be burned, on the other hand, because I'm skeptical about what the quality: Based not synonymous to the SVCD mpeg2? Here at any rate, my attempts - as I said - absolutely unacceptable.

"B. DeKid" wrote:
Also in SUPER XVID example and then choose the XVID codec windows "Home Theater" ... choose that makes you about 10 minutes from 300MB, which should work on any player with DIVX / XVID smooth running function.


Aha, you are so mpeg4 files in this order of magnitude more in the frame. If I had not thought of. For me (tube TV) is perhaps synonymous's' ne number of small ...

"LarsProgessiv" wrote:
Target video size = 1MB (yes really!)


Thank you, Lars, for the reference to avidemux. Something like in the way I've always wanted!

For your quoted Note: this refers specifically to the size of my 10 minutes video, or is it a general one, "fixed" size?
Ever: Are all these settings (for me anything Bohemian villages) especially on large DV files tailored?

Beautiful weekend
Andreas



Antwort von tommyb:

Quote:
Is not synonymous to the SVCD mpeg2?

SVCD is based on MPEG2, but has a reduced horizontal resolution (720x576 DVD, SVCD 480x576). Therefore, synonymous of quality difference.



Antwort von LarsProgressiv:

Hello Brockhaus,

"Brockhaus" wrote:
First many thanks for your answers!

"LarsProgessiv" wrote:
Target video size = 1MB (yes really!)

For your quoted Note: this refers specifically to the size of my 10 minutes video, or is it a general one, "fixed" size?

So I suppose this size forever. The objective is to indicate that not the size but the maximum quantizer materialize.
If the size of 1MB, but setting the maximum (worst) to 7 Quantization is, the picture never worse than this suggests quantizer.

"Brockhaus" wrote:
Ever: Are all these settings (for me anything Bohemian villages) especially on large DV files tailored?

Beautiful weekend
Andreas


No, the settings are always the same. It is so synonymous always a sequence of images. And if you use the smallest file for a given quality would like to have it, use these settings always. Only the fields with the depend of the source.
And of course you can still filter installed, the black bars top and bottom or left and right cut.

@ tommyb: With the sound you have right, of course. I always watch my movies s.Calculator, because I do not have television.

Regards
Lars




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