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• avcodec/ff_init_vlc_sparse : use a local array for static vlcs avoiding malloc()

  13 juillet 2013, par Michael Niedermayer

  avcodec/ff_init_vlc_sparse : use a local array for static vlcs avoiding malloc()
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/bitstream.c

• Making colour of MP4 video consistent in Chrome

  21 septembre 2021, par OneWorld

  I see a difference in the colour of a video between different machines using different browsers. I was wondering what the cause of the difference is ?

  


  I use FFMPEG to create the video. I sent the video to three different people with slightly different machines, and slightly different Chrome versions, to try and see where the differences are.

  


  The FFMPEG output from the video is as follows :-

  


  ffmpeg version 3.2.2-static http://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.4.1 (Debian 5.4.1-4) 20161202
  configuration: --enable-gpl --enable-version3 --enable-static --disable-debug --disable-ffplay --disable-indev=sndio --disable-outdev=sndio --cc=gcc-5 --enable-fontconfig --enable-frei0r --enable-gnutls --enable-gray --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg
  libavutil      55. 34.100 / 55. 34.100
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.100 / 57. 56.100
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'red_and_yellow_uat.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.56.100
  Duration: 00:00:03.00, start: 0.000000, bitrate: 84 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, unknown/bt709/bt709), 1080x1080, 81 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler


  


  From the same UAT rendered Video, with screenshots taken in Chrome from person 1, person 2, person 3, and person 4, and using GIMP colour picker on my machine from the screenshots, the results for red, and yellow are as follows.

  


  Person 1:- #A83833  and  #FFCB2E  Chrome Version 92.0.4515.131 (Official Build) (64-bit)
Person 2:- #AB3334  and  #FFCA38  Chrome Version 92.0.4515.107


  


  (Note : these colours Match / are very close to the original).

  


  Both these machines above are 64 bit Ubuntu machines, using Ubuntu 18.04.5 LTS
We both use the gnome screenshot tool in Ubuntu to take the screenshot, which creates an 8bit PNG.

  


  Person 3:-    #B14039  and  #FED303  Chrome Version 93.0.4577.63 (Official Build) (x86_64)
Person 4:-    #B2403A  and  #FFD201  Chrome Version 92.0.4515.159 (Official Build) (x86_64)


  


  Mac screenshots are taken using cmd shift 4, and generate an 8bit PNG file.

  


  Person 3 Machine Spec :-
Machine :- Macbook Pro (2019)
OS : macOS Big Sur Version 11.5.2
Processor :- 2.6Ghz Intel Core i7 processor. 32bit architecture (typing arch in her tty terminal returns i386).
Graphics :- Intel UHD Graphics 630 1536

  


  Person 4 Machine Spec :-
Machine :- Macbook Pro (Retina, 2015)
OS :- MacOS Mojave, Version 10.14.6
Processor :- 2.5GHz, Intel Core i7
Graphics :- AMD Radeon R9, M370X 2 GB Intel Iris Pro 1536 MB

  


  Person 1 screenshot

  


  

  


  Person 2 screenshot

  


  

  


  Person 3 screenshot

  


  

  


  Person 4 screenshot

  


  

  


  Any suggestions anyone has to make these colours consistent would be much appreciated. Would love to know why it happens also ? If anyone can explain ?

  


• Making a timelapse by drag and drop - A rebuild of an old script using ImageMagick

  14 août 2019, par cursor_major

  I have written an apple script previously to automate a task I do in my work many times.

  I shoot Raw + JPG in camera, copy to hard drive.

  I then drag named and dated folder eg. "2019_08_14_CAM_A_CARD_01" on to an automator app and it divides the files in to folders "NEF" and "JPG" respectively.

  I then drag the appropriate "JPG" folder onto my Timelapse app and it runs the image sequence process in QT7 and then saves the file with the parent folder name in the grandparent folder. This keeps things super organised for when I want to re link to the original RAW files.

  [code below]

  It is a 2 step process and works well for my needs, however, Apple are going to be resigning Quicktime 7 Pro so my app has a foreseeable end of life.

  I want to take this opportunity to refine and improve the process using terminal and ImageMagick.

  I have managed to work some code that runs well in terminal, but I have to navigate to the folder first then run a script. It doesn’t do the file renaming and doesn’t save in the right place.

  Also, when I try and run the simple script in an automator ’App’ it throws up errors even before trying to add anything clever with the file naming.

  Later, once I have recreated my timelapse. maker app I want to get clever with more of ImageMagicks commands and overlay a small super of the original frame name in the corner so I can expedite my reconnecting workflow.

  I’m sorry, I’m a photographer not a coder but I’ve been bashing my head trying to work this out and I’ve hit a brick wall.

  File Sorter

      repeat with d in dd
  
          do shell script "d=" & d's POSIX path's quoted form & "
  
  cd \"$d\" || exit
  
  
  
  mkdir -p {MOV,JPG,NEF,CR2}
  
  find . -type f -depth 1 -iname '*.mov' -print0 | xargs -0 -J % mv % MOV
  
  find . -type f -depth 1 -iname '*.cr2' -print0 | xargs -0 -J % mv % CR2
  
  find . -type f -depth 1 -iname '*.jpg' -print0 | xargs -0 -J % mv % JPG
  
  find . -type f -depth 1 -iname '*.nef' -print0 | xargs -0 -J % mv % NEF
  
  
  
  for folder in `ls`; 
  
  do if [ `ls $folder | wc -l` == 0 ]; then 
  
      rmdir $folder;
  
  fi; done;
  
  
  
  "
  
      end repeat
  
  end open```
  
  
  
  
  
  
  
  Timelapse Compiler
  
  
  
  ```on run {input, parameters}
  
      repeat with d in input
  
          set d to d's contents
  
          tell application "Finder"
  
              set seq1 to (d's file 1 as alias)
  
              set dparent to d's container as alias
  
              set mov to "" & dparent & (dparent's name) & ".mov"
  
          end tell
  
          tell application "QuickTime Player 7"
  
              activate
  
              open image sequence seq1 frames per second 25
  
              tell document 1
  
                  with timeout of 500 seconds
  
                      save self contained in file mov
  
                  end timeout
  
                  quit
  
              end tell
  
          end tell
  
      end repeat
  
      return input
  
  end run```
  
  
  
  
  
  Current code that runs from within Terminal after I have navigated to folder of JPGs
  
  
  
  ```ffmpeg -r 25 -f image2 -pattern_type glob -i '*.JPG' -codec:v prores_ks -profile:v 0 imagemagick_TL_Test_01.mov```