Does a Constant quantizer of 0-0-0 mean lossless/no compression? Or is it considered “visually lossless”?
Hi
. . . . . Constant quantizer of 0-0-0 mean lossless/no compression? . . . .
There have been several, long discussions on this and related settings of advanced setting for the export codecs and the common recommendation is do not touch these settings.
The export presets are already optimized and adjusting them can make the video export worse.
When you change some of the advanced settings you are altering the encoders operating parameters which determine how data rate, bitrate,quantization, etc, are adjusted automatically eg where there is a lot of action is the video the codec can automatically compensate for movement.
Unless you have the necessary tools to analyse the video exported with different settings, then you are relying on visual perception, which is easily misled, to determine which setting change gives better quality video or not.
Also bear in mind that what you see on your monitors is not what others will see on theirs.
HTH
John EB
Hi
. . . . . Constant quantizer of 0-0-0 mean lossless/no compression? . . . .
There have been several, long discussions on this and related settings of advanced setting for the export codecs and the common recommendation is do not touch these settings.
The export presets are already optimized and adjusting them can make the video export worse.
When you change some of the advanced settings you are altering the encoders operating parameters which determine how data rate, bitrate,quantization, etc, are adjusted automatically eg where there is a lot of action is the video the codec can automatically compensate for movement.
Unless you have the necessary tools to analyse the video exported with different settings, then you are relying on visual perception, which is easily misled, to determine which setting change gives better quality video or not.
Also bear in mind that what you see on your monitors is not what others will see on theirs.
HTH
John EB
If this is the case then what is the point in allowing you to change the settings? And a lot of the time the default settings aren’t actually right for your own specific source material.
Hi Dean.
Any major software editing program, whether for video, audio or still images, allows a high degree of reconfigurability for those that need it. Normally professionals with specific needs for output to specific devices, often non-domestic products that don't conform to a mass market need or to convert older material coded in the past for older equipment with different pixel dimensions to modern standards.
Take the above original question of the 0-0-0 options. From what I have read so far (which isn't much) they are not as one may guess a quality value but an instruction set that control a group of pixels within a block, how many pixels to use and which direction to group them in, vertically or horizontally. Get it wrong and you are going to get some very strange looking artifacts apearing within the video.
There is a lot of information on the net about these settings and how they work but most of the documents are mainly math based. I know just enough to know I wouldn't know where to start.
Hi
. . . . And a lot of the time the default settings aren’t actually right for your own specific source material . . .
That depends on what you are trying to achieve in changing these advanced settings.
John EB
Hi Dean.
Any major software editing program, whether for video, audio or still images, allows a high degree of reconfigurability for those that need it. Normally professionals with specific needs for output to specific devices, often non-domestic products that don't conform to a mass market need or to convert older material coded in the past for older equipment with different pixel dimensions to modern standards.
Take the above original question of the 0-0-0 options. From what I have read so far (which isn't much) they are not as one may guess a quality value but an instruction set that control a group of pixels within a block, how many pixels to use and which direction to group them in, vertically or horizontally. Get it wrong and you are going to get some very strange looking artifacts apearing within the video.
There is a lot of information on the net about these settings and how they work but most of the documents are mainly math based. I know just enough to know I wouldn't know where to start.
I read online that the 3 numbers are the quality values for the 3 different frame types (I, P, B).
Then you are finding things I'm not. I suggest you carry on your research and maybe you will find the answer elsewhere because I for one have given you my thoughts as have others. I'm not a programmer or a software engineer but I know from past experience over a long period with other image formats that once any alteration to an original image or sound file is made that the resulting copy can never be exactly the same. If you feel differently then you should pursue your investigations but I doubt most users here will be able to help. Personally, most of my work entails using H264 with MPEG-4. I have little use for the other older options.
I do honestly wish you luck but I think you will be just chasing a hard to achieve goal with little chance of improving your situation. The fact you keep turning up here seems to suggest you aren't making much headway.
The fact you keep turning up here seems to suggest you aren't making much headway.
Hi,
I’m not too sure what you were getting at there.
Hi
. . . . I read online that the 3 numbers are the quality values for the 3 different frame types (I, P, B) . . .
Quantization works at a much lower level than frames, ie at the block level, the values are varied on a block-by-block and frame-by-frame basis to control the quality.
The bottom line is, by changing the default preset values, which are optimised to balance all the different effects on quality, bitrate allocation and file size, perceived quality etc, the encoder is being forced out of the best compromise of a series of conflicting requirements.
. . . . The fact you keep turning up here seems to suggest you aren't making much headway. . . . .
To paraphrase what @CubeAce said, by delving into these settings a great deal of time may be wasted for very little gain ie altering the video encoding strategies and parameter settings are like going down the rabbit hole.
John EB
Hi Jak.
What I meant was simply that those replying to you on this forum have stated time and again that any editing involves loss of quality and that any comparing of before and after will show differences. It's the nature of the beast so to speak.
That the controls you see don't do things the way most people think they do and are already optimised to the best of the software engineers abilities and any tampering will most probably lead to less optimal results than those already obtained but you seem to steadfastly disbelieve this.
That's fine, as those bothering to answer (or at least me) could be wrong, but on a personal level I believe the same as John EB, that you are looking for gains where there is very little chance of finding them beyond those found in the presets.
Hi Jak.
What I meant was simply that those replying to you on this forum have stated time and again that any editing involves loss of quality and that any comparing of before and after will show differences. It's the nature of the beast so to speak.
That the controls you see don't do things the way most people think they do and are already optimised to the best of the software engineers abilities and any tampering will most probably lead to less optimal results than those already obtained but you seem to steadfastly disbelieve this.
That's fine, as those bothering to answer (or at least me) could be wrong, but on a personal level I believe the same as John EB, that you are looking for gains where there is very little chance of finding them beyond those found in the presets.
Hello,
It’s not a case of disbelieving in any way. I was only giving an answer to the original question to this post regarding the 0-0-0 thing. And that answer I gave is purely based on research that I have done on the topic of the 3 quantizer values and their meanings. However, whether or not the information is accurate, I’ve no idea.