I can see MACROBLOCKS in a DV file , why??

[junkmalle]

i got my Aiw card , and i have to say that it is 1000 times better!
I dont have any mc's problems now

Fos, could you post samples made with your AIW card? If possible, the exact same frames you posted earlier would be the most useful. Thanks!

[Fos]

yes , of course
1.rar

[junkmalle]

Fos, Thanks for the new image. There's quite a difference from the earlier DV500 image. I can see they aren't exactly the same frame -- are these typical frames of that sequence or is the earlier DV frame one particular frame that was bad?

The reason I ask is because, in the DV frame, one field is nearly all black and the other field is over exposed. Either the light strobed off/on between those two fields or there was something really wrong with your DV500.

[vhelp]

Yeah. I agree with junkmalle.

The pic you U/L 'ed looked better in that there were no macro
blocks in that frame that I could see. But..

As a side note.. its always a good idea to follow your issues
time-line. If you demo frame 103, then you should follow your
new 'er pic, using the same frame number. Otherwise..

-->

I too, also think that there was an issue with your DV500 device.
Either that or, (and/or) screwy driver/codec/installation with
your given setup. But, more likely a driver issue, imo.

- If you repost a pic, be sure to not "taint" it with color
correction or what-have-you. Keep it untouched and clean.

-->

But, as long as you are satisifed, that is all that really matters
here.

Thanks.

-vhelp 3322

[Fos]

yes i like more the ati but when the video jumps it dropped frames , and with my dv500 it didnt drop frames

[Fos]

returning to this thread....
I got the other day a canopus advc 50. I don't know why , but i am having the same problems that i had with the dv500. They are much less , but with ohter tapes appear exactly the same macroblocks.
I am using other computer.
Other thing is that when i see the video in the morning is very difficult to see some macroblocks but in the night is easy(the illumination).
I can't see these macroblocks in my tv , like the others one created with the dv500.
There is clip in mpeg2 uploaded.
Thanks
http://s4.yousendit.com/d.aspx?id=3L84L3YKJOG521AZ9FK6JLXG6H

[junkmalle]

For a noisy VHS cap converted to DVD MPEG that clip had the expected amount of macroblocking.

The worst parts are when lights are flashing but that's exactly where you expect to see macroblocks. A large part of MPEG compression involves encoding only parts of the picture that change between frames. Unfortunately, when the picture is fading in or fading out, almost every pixel is changing, so MPEG can't handle it well. Add to that the general noise from the VHS tape (most pixels vary a little in intensity and color from frame to frame) and small timinging errors and you get MPEG footage with macroblocks.

Some things you can do: get a high quality VHS player with noise reduction and a line based TBC. Get a full frame TBC. In lieu of new hardware a little software spatial and temporal noise filtering will help.

You can also try encoding at 352x576. Your VHS source doesn't really have any more resolution than that so you don't really need to encode at 720x576. Reducing the resolution does two things for you. First, there are half as many pixels to compress so your bitrate goes farther. Second, you get some noise reduction if you use a proper resizing filter.

[Fos]

Some things you can do: get a high quality VHS player with noise reduction and a line based TBC

I used a jvc Hr-s7700 for playback the tape wich is vid(2)[ Master->copy->copy] with the DNR/TBC ON . You say that it have noise , but it could have more noise with a panasonic or an older vhs , like the others that i have so i don't think that i need other VCR.
Also these macroblocks appear too in the DV clip , but the result is not so bad , it could have be worse with the dv500.

[junkmalle]

I used a jvc Hr-s7700 for playback the tape wich is vid(2)[ Master->copy->copy] with the DNR/TBC ON .

The line TBC should have gotten rid of the little timing errors. For example, here is a 8x enlargment of a crop of the top right corner of the doorway near the center of the screen in the first part of the video, three consecutive frames:



As you can see, what should have been a nice straight vertical edge has become jagged and wavey -- and it changes with each frame (the camera was still during this sequence). This kind of problem absolutely kills MPEG.

[Fos]

i wanted ask you why i dont have this problem capturing with the ati