Changing black levels doesn´t work anymore

Started by qqqavi, April 07, 2017, 09:14:40 AM

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qqqavi

Hi everyone.

For some reason, changing the black level with mlv_dump doesn´t work anymore. It did work before.



I always used this command as in the thread http://www.magiclantern.fm/forum/index.php?topic=11664.0:
mlv_dump --black-fix=2048 -o out.mlv in.mlv

It creates a new mlv, but with no changes at all. It drives me crazy....

If I export to .dng (Raw2cdng) and I use the exiftool command -BlackLevel=2048 input.dng , I get the ¨0 images updated¨ message. Someone knows why?

Here you can download a .dng file:
https://file.town/download/m1smv1v2a3sck3qh0x93ji5kd

Is there  way to fix this?

I´m on a Windows 8.1 machine.
Thank you.


a1ex

Can you upload a small MLV so others can try reproducing the issue?

If you cannot change the black level on a DNG, it's a problem with the DNG converter (and you should report it in the relevant thread).

qqqavi

Hi there.

I´ve just upload a mlv  file   ( 134MB - that´s the smallest one I  have) with the wrong  black levels.

You can download it here:

https://expirebox.com/download/f56643f020df06a01ae63f07756d9f43.html

As I said, I´m not able to change the black level with mlv_dump anymore, no matter what value I put. A new mlv is created, no errors, just that the new mlv looks exactly the same.  It never happened to me before.

Thank you. 


Danne

Black level 2289 and it works perfectly well to change it to 2048 in mlv_dump over here.

qqqavi

How did you do it?

My workflow is (on Win):

1.  I copy the mlv_dump.exe on the same folder as the mlv file
2. I run ¨cmd¨ to open the command window
3. Go to the mlv file location (e.g. C:\Folder>)
4. I run the c:\Folder>mlv_dump --black-fix=2048 -o b.mlv m01-1526.mlv

That´s  the  message I get after, however the new mlv looks the same:

Mode of operation:
   - Input MLV file: 'm01-1526.mlv'
   - Setting black level to 2048
   - Rewrite MLV
   - Output into 'b.mlv'
File m01-1526.mlv opened
File m01-1526.m00 not existing.
Processing...
Reached end of chunk 1/1 after 264 blocks
Processed 46 video frames
Done

Danne

Don,t think you can rewrite the MLV file with new black level. Try:
mlv_dump --dng --black-fix=2048 m01-1526.mlv

qqqavi

It worked!!!

The problem was that on this thread http://www.magiclantern.fm/forum/index.php?topic=7122.0
there are two links to download the mlv_dump:


BAD VERSION where it says WIN ONLY (didn´t worked for me):
mlv_dump: most recent nightly download page. (binary for WINDOWS only)

GOOD VERSION: mlv_dump: or here (binaries for WINDOWS, LINUX and OSX)

I´ve tried the second  one and it worked. I don´t know why, perhaps the two .exe are different. So frustrating.

Thank you.

Danne


qqqavi

Thank you very much  for your time and support.
Best.