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• frame rate converter to increase or decrease the fps count [on hold]

  30 juin 2017, par Siddharth

  I am trying to create a frame rate converter, specifically in C++. the objective is to either decrease the frame rate of a Video segment(example 29.97 fps to 25 fps by deleting frames which are redundant or reused) or to increase the frame rate of a Video segment(25 fps to 30 fps by inserting frames to increase frame rate count). I would ideally like to load the video file, check its fps, then increase or decrease the fps respectively. Is there any way to achieve this with ffmpeg or opencv ?

• Convert image sequence to video using ffmpeg and list of files

  13 mai 2015, par rensa

  I have a camera taking time-lapse shots every 2–3 seconds, and I keep a rolling record of a few days’ worth. Because that’s a lot of files, I keep them in subdirectories by day and hour :

  images/
  
      2015-05-02/
  
          00/
  
              2015-05-02-0000-02
  
              2015-05-02-0000-05
  
              2015-05-02-0000-07
  
          01/
  
              (etc.)
  
      2015-05-03/

  I’m writing a script to automatically upload a timelapse of the sunrise to YouTube each day. I can get the sunrise time from the web in advance, then go back after the sunrise and get a list of the files that were taken in that period using find :

  touch -d "$SUNRISE_START" sunrise-start.txt
  
  touch -d "$SUNRISE_END" sunrise-end.txt
  
  find images/"$TODAY" -type f -anewer sunrise-start.txt ! -anewer sunrise-end.txt

  Now I want to convert those files to a video with ffmpeg. Ideally I’d like to do this without making a copy of all the files (because we’re talking 3.5 GB per hour of images), and I’d prefer not to rename them to something like image000n.jpg because other users may want to access the images. Copying the images is my fallback.

  But I’m getting stuck sending the results of find to ffmpeg. I understand that ffmpeg can expand wildcards internally, but I’m not sure that this is going to work where the files aren’t all in one directory. I also see a few people using find’s --exec option with ffmpeg to do batch conversions, but I’m not sure if this is going to work with image sequence input (as opposed to, say, converting 1000 images into 1000 single-frame videos).

  Any ideas on how I can connect the two—or, failing that, a better way to get files in a date range across several subdirectories into ffmpeg as an image sequence ?

• Redirect video stream from an Ip

  23 juin 2017, par Psykomusic

  I’m developping an embded device with Yocto (krogoth) OS. The device belong to a network with IpCamera. I’m looking for a light solution to redirect the stream received from a port and forward it to an other IP.
  I don’t know if it clear enought but for the moment I use GStreamer and this command :
  gst-launch-0.10 udpsrc port=myport ! udpsink host=xxx.xxx.xxx.xxx port=otherport.

  I hope there is an other solution because this command requires GStreamer and it’s quit heavy on my device.

  I have already ffmpeg on it maybe ffmpeg offers a solution for this.
  How can I do this redirection without Gstreamer ?

  Thank you,
  Antoine