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• ffmpeg glitch while converting DNG sequence into mp4 video

  21 août 2020, par AnnoyedByAds

  I have two problems with FFmpeg, when I use it to join DNG files sequence into mp4 video file. I also need to downgrade the resolution of the video from 6016x3200 to 2030x1080.
First of all I got almost black screen in the resulting video. Had to play with gamma and brightness options. But it was not enough !

  


  New problems :

  


  


  1. something strange happens with aspect ratio in resulting video file : in the first frame aspect is normal, just like in the original picture, but all the rest frames are getting squeezed. can't figure out why this happen !? (see picture attached).

     


  


  2. colors are desaturated. despite the fact that I set "saturation" option to the maximum value. and also, the first frame of the video is different from the rest (while DNG files are all similar, first is no exception)

     


  


  


  I tried prores codec as well, with the same result.

  


  command I use is simple :

  


  ffmpeg.exe -start_number 1 -i "K:\video\copter_R%5d.dng" -c:v libx264 -vf "fps=25,format=yuv420p, eq=gamma=3.2:brightness=0.2:contrast=1.6:saturation=3, scale=w=2030:h=1080" e:\output.mp4


  


  I tried to use different variants of scale parameter : "scale=-1:1080" as well.

  


  Illustration :

  


  

  


  UPDATE : ffmpeg log report for operation :

  


  https://drive.google.com/file/d/1H6bdpU0Eo4WfR3h-SRtgf7WBNYVFRwz2/view?usp=sharing

  


• Fixing a corrupted .MP4 file. which might be a 3gp file

  2 juin 2020, par Tendekai Muchenje

  I have a file called input.MP4 and it is corrupted. It's from a CCTV camera. I tried everything, ffmpeg, VLC convert, no luck. However, I used mediainfo and exiftool and extracted the following info. I am wondering if someone can figure out if I can use any of this info to fix it or convert it to a usable format. I have a copy of it here on my Google Drive

  



  mediainfo gave me this :

  



  General
Complete name                       : input.MP4
Format                              : MPEG-4
Format profile                      : 3GPP Media Release 5
Codec ID                            : 3gp5 (3gp5/3gp4/avc1/mp42/isom)
File size                           : 5.77 MiB
IsTruncated                         : Yes


  



  exiftool gave me this :

  



  ExifTool Version Number          : 10.80
File Name                        : input.MP4
Directory                        : /home/tendi/Downloads
File Size                        : 5.8 MB
File Modification Date/Time      : 2018:07:21 19:09:03-04:00
File Access Date/Time            : 2018:07:21 19:30:48-04:00
File Inode Change Date/Time      : 2018:07:21 19:30:48-04:00
File Permissions                 : rw-rw-r--
File Type                        : 3GP
File Type Extension              : 3gp
MIME Type                        : video/3gpp
Major Brand                      : 3GPP Media (.3GP) Release 5
Minor Version                    : 0.0.0
Compatible Brands                : 3gp5, 3gp4, avc1, mp42, isom
Movie Data Size                  : 5899106
Movie Data Offset                : 44


  



  Any suggestions ?

  


• ffmpeg - prop flicker removal works but ffmpeg insists on changing framerate [closed]

  28 avril 2023, par Mutley Eugenius

  I have been researching how to use FFmpeg to do some fantastic wizardry on my cockpit videos to remove the dramatically distracting propeller, but after many hours now I cannot seem to find a way to get the program to stop stripping more than half the frames. The source video file is 1920 x 1080 @ 60fps and I believe I have my offset right (1/60= 0.0166) but the output video is always coming out at 25 fps. Can't see what element in the code is telling it to do that, or how to change it.

  


  Here's my file :

  


  https://drive.google.com/file/d/1VPttH4PHgUr0uzmsbl4Bcyg5_gAixblA/view?usp=sharing

  


  Here's my code :

  


  ffmpeg -i G:\PropFlicker.mp4 -itsoffset 0.01666 -i G:\PropFlicker.mp4 -filter_complex color=0x202020:s=1920x1080:d=24[mask];[mask][0][1]maskedmax=[out] -map [out] -crf 10 G:\PropNoFlicker.mp4


  


  I have tried adding -r 60 which gives me a 60 fps output file, but the video is still being processed at 25 and it just adds in duplicated frames after processing to pad it out to 60. The rendering shows more dropped frames than rendered frames by about a 3 to 2 ratio which matches frame drops from 60 to 25. I lose my shot fluidity and I get flickery artifacts

  


  What am I missing to get the flicker removal processing done at 60 fps and the output file rendered at 60 fps with the original smoothness ?

  


  I'm also not sure what the :d=24 is doing. I tried d=60, but it made no difference.

  


  I copied original code that I found in this link :

  


  text