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• Is there a way to extract a video frame, encode a sentence behind it, put it back, and then decode it ?

  29 juillet 2021, par Jesse Hix

  I am trying to do stenography on an MP4 video where I am pulling a frame out at a certain time, 5.52 sec, saving that frame as a jpg or jpeg using any image stenography tool, in this case stegosuite, to encode a sentence behind the image and then reinsert that image back into the video at the same time and then extract it again with the same command and using the same steno tool read the message.

  


  Up until decoding the message everything runs without issue.
I know that it is not working because the videos are not the same in size meaning that the frankenstein video is not the same as the original and thus messing up the frame extraction.

  


  Question :
  Is there a way to extract a frame encode a sentence behind it put it back and then decode it ?

  


  What I tried :
  
Used to extract the frame both times :

  


  ffmpeg -ss 5.52 -i original.mp4 -vframes 1 frames_%d.jpg


  


  Used to combine the image back into the video :

  


  ffmpeg -i original.mp4 -i frames_1_embed.jpg -filter_complex "[1]setpts=5.52/TB[im];[0][im]overlay=eof_action=pass" -c:a copy out_1.mp4


  


• doc/ffmpeg : improve -disposition, -stats, and -progress documentation

  17 octobre 2024, par Soma Lucz

  doc/ffmpeg : improve -disposition, -stats, and -progress documentation
   disposition :
  
  Clarify the meaning of the default value, and how the '+' and '-'
  
  prefixes work. Add more examples.
   stats :
  
  Clarify that it appears as an "info"-level log.
   progress :
  
  Add info about the "progress" key's value being "continue" or "end".
  
  Add an example of logging to stdout.
  Signed-off-by : Soma Lucz <luczsoma@gmail.com>
  
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DH] doc/ffmpeg.texi

• Solution Merge mp3+mp4 together with FFMPEG or other

  7 juin 2018, par SandyUgale

  I have been working on a project where I have .mp3 and video file (.MP4). I have FFMG on my AWS server and I’m providing both to FFMPEG give me complete video file with provided audio file. Then I send this file to my AWS S3 and then fetch this video as needed in my web app.

  Problem/Use Case :

  If I have 10 mp3 and 10 mp4 video files then I have to wait the until it complete all videos then only I can send them on S3, so Im waiting for long as number goes up.

  Can I control this ?

  Solution-1 : Don’t need to wait for loop

  Meaning instead of starting all merging together parallel I would like merging to be done one by one. Referencing above example

  First merge of 1.mp3 + 1. Mp4= 1.mp4 (complete file) –upload s3.  
  
  Second merge of 2.mp3 + 2. Mp4= 2.mp4 (complete file) –upload s3.  
  
  Tenth merge of 10.mp3 + 10. Mp4= 10.mp4 (complete file) –upload s3.  

  Solution-2 : send video as they ready

  How I can know which video has been ready to send to s3 ?

  Solution-3 : other service

  Is there any other online API or services where I can pass mp3 + mp4 and give me video url simply after merging so technically video will hosted on either their platform or on my S3 doest matter.