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• Can I use ffmpeg to output JPEGs to a memory stream instead of a file ?

  10 juillet 2024, par Andrew Simpson

  I have a C# app. I have 100 JPEGs (for an example).

  



  I can easily encode this into a video file.

  



  When it has finished encoding on the client app I FTP upload to my server.

  



  It would be 'neater' if I could not write the video file to a disc but instead write it to a memory stream (or array of bytes) and upload via web service perhaps ?

  



  I have checked out the ffmpeg documentation but as a C# developer I do not find it natural to understand the C examples.

  



  I guess my first question is it possible, and if so can anyone post an example code in C# ? At the moment I am using the process class in C# to execute ffmpeg.

  


• ChromaKey FLV Transparency

  1er décembre 2012, par Mr D

  I have over 20000 FLV's at the moment. They currently have no alpha channel and are all CGI generated text on a black background.

  My issue :
  I need to be able to remove the black background and make it transparent, so I can use these videos to layer over pictures in my flash project.

  It needs to be an automated process, that can go through the whole dir of videos and remove the backgrounds

  What I've tried ?

  I have spent the last three days pulling my hair out. Currently the option I see is to write a custom filter for ffmpeg.

  The end goal :

  Layer the flv videos over randomly generated videos in an adobe air application built in flex.

• Why isn't the 'wrap' option recognized in FFmpeg's drawtext filter ?

  24 février 2023, par eugene_prg

  I'm trying to add text to a video using FFmpeg's drawtext filter, but I'm running into an issue with the 'wrap' option. Whenever I include 'wrap=500' in the filtergraph, I get the following error message :

  


  [Parsed_drawtext_1 @ 0x563e23b1f500] Option 'wrap' not found
[AVFilterGraph @ 0x563e23b18d00] Error initializing filter 'drawtext' with args 'enable=between(t,0,4):text=one day you wake up and...:x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5:wrap=500'
Error reinitializing filters !
Failed to inject frame into filter network : Option not found
Error while processing the decoded data for stream #0:0

  


  Here's the full command I'm using :

  


  ffmpeg -y -i "./videos/pexels-ivan-samkov-6689156.mp4" -vf "drawtext=fontfile=./fonts/DejaVuSans.ttf:text='DID U KNOW':x=(w-text_w)/2:y=200:fontsize=72:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=10, drawtext='enable=between(t,0,4)':text='do you know that girls...':x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5:wrap=500, drawtext='enable=between(t,4,8)':text='are smarter than guys?':x=(w-text_w)/2:y=570:fontsize=48:fontcolor=white:box=1:boxcolor=black@0.5:boxborderw=5" -c:a copy "pexels-ivan-samkov-6689156.mp4_with_labels.mp4"


  


  I'm not sure why the 'wrap' option isn't recognized. Can anyone help me figure out what's going on ?