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• ffmpeg converting video to images while video file is being written

  20 décembre 2018, par user3398227

  Hopefully an easy question for an ffmpeg expert !

  I’m currently converting large (+6GB) mpeg video into an image sequence - which is working well using the below ffmpeg command :

  ffmpeg -i "input.mpeg" -vf - fps=fps=2 -f image2 -qscale 1 -s 1026x768
  "output%6d.jpg"

  however i have to wait for the file to finish being written to disk before i kick off ffmpeg - but this takes a good hour or so to finish writing, but what i’ve noticed is that ffmpeg can start reading the file while its being written to disk - the only snag here is it gets to the end of the file and stops before the file has finished being written...

  Question is, is there a way that ffmpeg can convert to an image sequence at the same pace the video is being written (and not exit out ?)... or know to wait for the next frame to be written from the source. (unfortunately the input doesn’t support streaming, I only get a network drive and file to work off.. ) I thought i read somewhere that ffmpeg can process at the video frame rate but cant seem to find this command for love or money in the doco !!

  Thanks !

• Grid/Mesh warping of videos with OpenCV

  2 février 2017, par andreas

  I would like to do some warping with OpenCV applied on Videos. Here is a demo in Javascript which perfectly explains what I want to achieve via OpenCV :

  http://persistent.info/web-experiments/distortion/
  Please select "Tron Legacy" in the drop down menu "Datasource"

  Here is also screenshot of the demo :

  Screenshot of the Demo

  I am not an expert in OpenCV, but as far as I know there are only methods about camera calibration which deals with distortions (but only with special ones like radial and tangential distortions). For my purpose, I need a more general approach.

  The overall goal : apply some kind of "filter" on any video which generates this kind of distortion, based on a grid which can be adjusted via drag and drop by a user. This filter does not have to work in real time. Hence, if you know any other frameworks which can be used for this, please let me know :-) I´ve checked the filter section of FFMPEG, but it seems that also these filters are not appropriate.

  Thanks for your help !!

• How do I fix HTTP 404 error message using FFMPEG command ? [on hold]

  18 décembre 2018, par Noob

  I am trying to download a video from this site (https://ffmovies.ru/film/night-school.kk6y4/16qmpp) and have tried using ffmpeg but it always returns an "HTTP Error 404 Forbidden." I’ve also tried using the wget command to consolidate all the ts files but that didn’t work either (I get the same error message). I am not on expert in this and was hoping someone out there can help me fix this problem. Here is the ffmpeg code that I inputed :

  ffmpeg -i https://cdn.mcloud.to/stream/sf:i0:q2:h5:p23:l1/vtYB9rGpyklG1sxXqgdmXg/1545238800/g/9/b/pj11w4/hls/480/480.m3u8 -c copy -bsf:a aac_adtstoasc output.mp4

  I have also attached a picture of the error message for reference. I really appreciate someone showing me what I am doing wrong.

  Cheers.