remove a logo without loosing quality

[mathmax]

Hi,

I have a 5.7 Gb DVD and I would like to remove the logo on it.
My problem is not how to remove the logo... but how to do it without loosing quality since I have to re-encode after that process.
Also I could make the output version 8.5Gb to match a DVD9. In this case do you think there will be a watchable difference between the original and the no-logo version?

Any advices will be appreciated

Thank you

[hech54]

do it without loosing quality since I have to re-encode after that process.

Not gonna happen.

[mathmax]

So I'll loose quality ok... but how much?

[RabidDog]

15.875% ??

[guns1inger]

The first issue is whether or not you can even remove the logo in such a way that the results are better than having the logo there. Personally I am not convinced by the results of any delogo-ing that I have seen done. At best you are left with a blurred area instead, and depending on the size and position of the logo, this can be far more distracting and annoying than the logo itself. Then you have to re-encode the entire video. If you increase the bitrate you may not notice the difference, but there will be a quality drop to some degree. As each video is different, there is no way to quantify it. You will have to try a sample and see if you are happy with the results. Make sure you use a good encoder.

[hech54]

15.875% ??

42

[mathmax]

The first issue is whether or not you can even remove the logo in such a way that the results are better than having the logo there. Personally I am not convinced by the results of any delogo-ing that I have seen done. At best you are left with a blurred area instead, and depending on the size and position of the logo, this can be far more distracting and annoying than the logo itself. Then you have to re-encode the entire video. If you increase the bitrate you may not notice the difference, but there will be a quality drop to some degree. As each video is different, there is no way to quantify it. You will have to try a sample and see if you are happy with the results. Make sure you use a good encoder.

with logo:
http://www.youtube.com/watch?v=7lrgrwsHMSc

without logo:
http://www.youtube.com/watch?v=ifSQKGfBj1M&feature=player_embedded

[manono]

Good job. What did you use on it?

[guns1inger]

I don't see it as that much of an improvement, sorry. However if you are happier with it gone and strange blurs and blobs replacing it, that's cool. I don't have to watch it.

However everything else I said still holds - there is simply no way to quantify what, if any, difference there will be from a re-encode. There are simply too many factors involved. Cut yourself a 5 minute representative sample, run it through your script and encode it with the same settings you intend to use for your final and see what you get.

[poisondeathray]

To be fair, that example is a lot better at logo removal than what you usually see

[mathmax]

ok. I hoped the compression process was smart enough not to change much the pixels of a video that has already been encoded.
What if you encode 100 times the same video with the same compression settings... what will you get at the end?

[poisondeathray]

What if you encode 100 times the same video with the same compression settings... what will you get at the end?

It gets noticeably worse each time. It's very bad with MPEG2 (for DVD) compression, even after 1 round you can usually see the difference. Each time , data gets irreversibly thrown out. But if you use a higher bitrate like you thought of going to DVD9 - you can mimimize the quality loss

The only way is to do some tests at your target bitrate, and see if the quality loss is acceptable to you

[El Heggunte]

To be fair, that example is a lot better at logo removal than what you usually see

"Consumer-friendly" logos?

[AlanHK]

At best you are left with a blurred area instead

Alpha-blend logos can be removed almost completely, restoring the original detail.
Using e.g. Nologo in Avisynth.