beginning of a encoded video looks pixeled

Apr 6, 2012 at 11:06 PM
Edited Apr 7, 2012 at 6:44 PM

Hello and sorry if my english its not too good:

Many times when i encode a video with a 1280x720 resolution, the beginning of the video looks pixel for the first 40 seconds, the principal settings i changed and used are these:

"video":

-Constant Quality: 20 (default)

-Avg bitrate: 500kbps

-profile: high

-preset: very slow

-Tune: Animation

"audio":

-Bitrate: 64kbps

Now, i used an other program to encode the same video with same settings  except that the audio bitrate was changed for 48kbps, it took more time to encode the video (preset: very slow in both cases) but didnt have the same problem, the program its called "CYKO" based in bencos or real anime and handbrake (uses CLI).

If someones knows why this happend and how to fixed i would be very grateful.

Coordinator
Apr 7, 2012 at 1:53 AM

The first thing I would do is try Constant Quality for the video. 50 kbps seems extremely low for 1280x720!

Apr 7, 2012 at 3:09 AM

Im sorry, it wasnt 50, are 500 kbps

Coordinator
Apr 7, 2012 at 6:06 AM

Well, my advice still stands.

Apr 7, 2012 at 6:49 AM

OK, i'll try it, but the problem its that with the other program took more time but the results were less MB and better qualty with the SAME settings, i like this program so i want to know if there is a way to get the same results. Thanks

Coordinator
Apr 7, 2012 at 5:37 PM

I have no way of telling you what exactly went wrong since you have posted no encode log. Specifying Average bitrate instead of Constant Quality isn't likely to do you any favors in the quality department though.

Apr 7, 2012 at 6:43 PM

Constant Quality: 20 (default), i understand that: if i put it more closer to the 0(left) the result will be a better quality because its says "high quality", im trying with 10, avg bitrate 500, audio bitrate 64  and i preset PLACEBO, if something changes for better ill post it as solved :)

Coordinator
Apr 7, 2012 at 6:54 PM

Please read the article I linked. 10 is not a good value for quality.

Apr 7, 2012 at 10:20 PM
Edited Apr 7, 2012 at 10:20 PM

Nothing worked, first cq: 10, preset: placebo = 791mb (original 290)

second cq: 18, preset: placebo = 301mb

third: cq 20, preset: very slow = 100mb but looks pixel at the beginning.

Coordinator
Apr 7, 2012 at 10:24 PM

Well I don't know what "very pixel" means so I can't help you here.

Apr 7, 2012 at 10:54 PM

its looks pixeled, thats it.

Coordinator
Apr 7, 2012 at 11:21 PM

http://vidcoder.codeplex.com/wikipage?title=Submitting%20bug%20reports

Jun 3, 2012 at 3:22 PM

Hi ! 

I also have this problem an almost every video converted with VidCoder.  The pixeled image appers at the begining of the video.

An Example here:

Original Video Image:

http://s18.postimage.org/h4n6rwi8p/Original_File.png

Converted Video Image:

http://s19.postimage.org/uhezim6k3/Connverted_File.png

I made some screenshoots of my settings:

http://postimage.org/image/rbzfpiu9b/

http://postimage.org/image/y3pusdj8v/

http://postimage.org/image/qc94ttf3j/

http://postimage.org/image/c73bs0627/

http://postimage.org/image/on01lqze7/

http://postimage.org/image/n1krtxp67/

Log Verbosity level is 2.

Here is the Log: (text or image)

http://dl.dropbox.com/u/26133258/LOG.Verbosity.2.txt

http://s19.postimage.org/58z7m27xv/Log.png

Here you can download orignal file if you want.:

http://dl.dropbox.com/u/26133258/%5BHD%5D%20%5BEnglish%5D%20Happy%20Feet%20-%20%20Somebody%20To%20Love.vob

 

Please help me. I also tried with 2 pass encoding and it's exactly the same output, i tried to change video filters, and nothing happend.

I also tried lower resolution , and nothing changed.

As an test i converted the original file with Format Factory to mp4 (H264, 1920x1080, 5000kb, 2 pass) and there is no pixeled image. The output is perfect. Please Help!!!!

Coordinator
Jun 3, 2012 at 5:50 PM

That looks like a problem with the video decoder. Which would be in the HandBrake core, not in my code.

Jun 3, 2012 at 7:29 PM

You are right. Because i test also with Handbrake, and the same pixeled image I have. Can you sugest me some good applications ? h264 or x264 cores are different on every application. Or all of  apps are based on Handbrake?

Coordinator
Jun 3, 2012 at 8:06 PM

It might not be a problem with x264, it might be a problem with the library they are using to decode the source video. It will probably be fixed in a future version.

Jun 6, 2012 at 11:47 AM
Edited Jun 6, 2012 at 11:50 AM

@blagasamuel

I looked thru your screenshots.  One thing you could try.  In the preset on the Video tab.  Try changing "Framerate" to 29.97 and checking "Peak Framerate (VFR)"  If you haven't already tried that.

I used to have a problem with some videos not playing correctly.  They would pause, stutter, and pixelate   After doing a lot of searching.  I found some suggestions to do the above suggestion.  And i have not had that problem since.

 

@duplakappa

You could try that also.

Jun 9, 2012 at 8:45 AM

 

Hi! @wisfalls sory for answering to late.

I tried with you settings and it's not working. Please download my vob file. Put the link into a downlaod accelerator , to download faster. And please try with your settings.

Absolutely nothing changed. Thanks for help

Link is from DropBox.com. It's a direct download.No waiting

Download Link:

http://dl.dropbox.com/u/26133258/%5BHD%5D%20%5BEnglish%5D%20Happy%20Feet%20-%20%20Somebody%20To%20Love.vob

Jun 9, 2012 at 11:38 PM

Well

I could not get the pixelation to go away with your file.  I could start the encode anywhere after that glitch and there would be no pixelation.  In fact it is within the first second of the video.  In vidcoder i encoded your file a couple of times using the seconds feature exp. 0 to 10 seconds 1 to 10 seconds 2 to 10 seconds.  The only one that had the glitch was the one that started at 0.

So i did some test.  I took two of my disc, one Blu-ray one DVD.  I took a small 3 min. clip and converted it to vob.  Both ntsc and pal.  I then opened them up in vidcoder and converted them to both mp4 and mkv with your settings and a few other settings.  

The results.

None of the encodes with vidcoder using my files developed the pixelation.  I am baffled, if it was the Handbrake decoder i should be able to reproduce it.

Let me clarify.  This happens to every video you try to encode with Vidcoder, and no matter what point you start a clip it occurs.  Meaning you could start a clip at 1hr or 1hr 20min into a video and it would result in pixelation at the beginning of each clip.

I downloaded Format Factory and tried your file.  The output also did not have any pixelation.

So my question to you.  Since Format Factory works for your files why do you want to use Vidcoder?

Sorry i don't have better news for you.

Jun 22, 2012 at 10:05 AM

Thanks for trying!

I want to use VidCoder because it has more options, which i don't find in format factory.