Suggestions for QuEnc

[Borat Sagdiyev]

First of all: Nic, thanks for this great program!

I have a few suggestions for QuEnc:

* A "Always / Never rewrite existing file" option
* Save first pass file ( I know it goes to some temp flder, but I can't seem to find it.) This would be useful if one want to do the second pass again but at a different bitrate.
* A pause button (wouldbe very handy)
* Log file (for when a crash or error occures)
* show the exact command for QuEnc in the bottom of the program
And of course multiple passes, but that's probably too difficult.

Thanks in advance,
Chenqui!

EDIT: spelling errors

[Encoder Master]

* A "Always / Never rewrite existing file" option
A pause button (wouldbe very handy)

This is very usefull.

And of course multiple passes, but that's probably too difficult.

I think not needed because in my tests 2pass gives the best quality. I tested with MEncoder till 10 Passes and FreeEnc/NuEnc and after 2passes the quality will not be better.

[Borat Sagdiyev]

Another suggestion is to show the exact command for QuEnc in the bottom of the program, so that one can write it's own batch files.

(Or to be implemented in QuEnc itself ;) )

[Borat Sagdiyev]

Originally posted by Encoder Master
This is very usefull.



I think not needed because in my tests 2pass gives the best quality. I tested with MEncoder till 10 Passes and FreeEnc/NuEnc and after 2passes the quality will not be better.

OK, will do.

[Koepi]

You didn't use the search it seems.

You can pause QuEnc by hitting the "PAUSE" key on your keyboard (!).

Multipass (>2) isn't necessary for XviD's ratecontrol (wich gets used in QuEnc >= 0.60), you would gain nothing.

If you're on a NT system, you will find the temp-folder here:
<system drive>:\<documents and settings>\<user-name>\<local settings>\temp

i.e.: c:\dokumente und einstellungen\koepi\lokale einstellungen\temp

(local settings is a hidden dir, you need to unhide hidden files and folders in your windows explorer to see it)

[Borat Sagdiyev]

Koepi, thanks for the reply.

But is it possible to load the pass file, and re-encode at a different bitrate?

[Mug Funky]

an option to set VBV size could be handy. SVCD and DVD use different ones

[Nic]

@mug funky: Didn't realise that, do you have a link to the exact numbers?

[Mug Funky]

from memory it's 112 kb for DVD and 224 for SVCD. i don't know the exact numbers...

[Encoder Master]

And also possible for MPEG-1 VCD res 48KB.

[Pookie]

Yes, OT, but just wanted to say thanks for the link to Borat. LOL.

[danpos]

Originally posted by Mug Funky
from memory it's 112 kb for DVD and 224 for SVCD. i don't know the exact numbers...

Nope: 224 KB for DVD, 112 KB for SVCD and 40 KB for VCD ... ;)

Cheers,

[Encoder Master]

40 KB for VCD ...

But 48Kb is better for MPEG-1 in VCD res. with VBR. For CBR 40Kb is OK.

[dragongodz]

Didn't realise that
Nic - yes you did. you just forgot. :D

But 48Kb is better for MPEG-1 in VCD res. with VBR. For CBR 40Kb is OK.
and since VCD is CBR danpos is correct in what he actually said. :)

[Encoder Master]

and since VCD is CBR danpos is correct in what he actually said.

Yes, but if we want a VCD with VBR then 48KB is perfect. I heard some experience about this and 48KB seems to be better for the most.

[4N]

HI,

I think there's some heavy limitation in QuEnc interface:

1) no "costant quality" parameter
2) no tools to convert quantization matrices,
or at least an example so people could get an idea about how to write them.
Furthermore QuEnc doesn't report errors if the matrix is bad/corrupted...
3) no "channels range" (0-255 or 16-235)
4) support of YUY2 color space for videos with better quality
5) mp2 audio type support: joint stereo, stereo, dual channel

It shouldn't be that hard to code them (except 4) and 5) ) so
I hope we (users) could see them solved in a close future.

Best regards.

[lithoc]

I think there's some heavy limitation in QuEnc interface:

1) no "costant quality" parameter



Bitrate <= 31 will change to Constant Quality.

[Inc]

@ Lithoc

He means "ConstantQuality".
The actual Option in Qenc you refer to is ConstantQuantizer ;)

PeterCheat did implement a CQ Option in Nuenc which works from 0 to 100 like in CCE.
So "IF" Theres a source available for that Version incl. the ConstantQuality approach, Nic could integrate it.

@ 4N

Refering to ...

2) Look for Ligh's Quantmatrix Editor which is capable to import and export to all useful qmatrix formats. And ... TmpgEnc or CCE also do not report if a Inter or Intra Matrix is corrupted or freaky in its values ;)
3) Couldnt that be done in the avs script? Using the Levels or ColorYUV Commands.
4) You mean mpeg2 4:2:2 High profile? That depends on the Libavcodec core and AFAIK this isnt supported yet. Only 4:2:2 mpeg decoding IMHO.
BUT it would be great if ffmpeg Team would integrate it. Also that would mean if it will be supported in the future FFdshow could integrate it which results in a nice capture codec option alternative. Means I/P/B in 4:2:2! incl. mpeg2source() 4:2:2 support.
5) I didnt thought about these options. Means: Nic, whats the one used actually? Stereo, JointStereo or DualChannel?

[4N]

Hi,

thanks for your replies :thanks:

@ Lithoc
costant quantizer isn't costant quality but it's good to know that ther's that option.
Pause button to pause the encoding process is another hidden option.
I wonder if there are other options like that and why they aren't documented into the readme file :confused:

@ incredible
2) it's what I was looking for, btw since QuEnc supports txt files an example could be nice ;)
3) this means that QuEnc uses range [0,255] ?
If that's the case than it's fine.
4) :(
5) they're enough important because you can/must change the bitrate depending of the option you use

Bye

[JoeBG]

* show the exact command for QuEnc in the bottom of the program


Any news in this topic? I´m interestet in commands for QuEnc :)

[Mug Funky]

it's a simple matter to write a batch file based on the nice list that "quenc -?" gives. if you want more automation, try making a batch that loads when you right-click a file, which prompts for bitrate and aspect ratio, and uses preset commandline settings for the rest...

[JoeBG]

it's a simple matter to write a batch file based on the nice list that "quenc -?" gives. if you want more automation, try making a batch that loads when you right-click a file, which prompts for bitrate and aspect ratio, and uses preset commandline settings for the rest...

Thanks you very much :)