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• Full C++ example avlib\FFMPEG multi input video filtering [on hold]

  30 juillet 2018, par Stefan Pintilie

  I am asking a question and also answering to it, on how to apply a multi input video complex filter using FFMPEG/avlib/avfiler libraries. I am doing this in hope that will help you, since it took couple of days to dig into ffmpeg code source, understanding it, putting the pieces together and make it work. The same could be applied to audio filtering.

  Everything starting from translating the following ffmpeg command into C++ code :

  ffmpeg -i world.mp4 -i back.png -filter_complex "[0:v]pad=1280:1000:0:0:black[pad];[pad][1:v]overlay=140:720[out]" -map "[out]" -map 0:a output.mp4

  Is basically stacking 2 videos on top of each other. The video from bottom has bigger width, so the final video file has the width of the bottom video and the height of all 2 together.

  Anyway that is just an example, the code example I am going to give you it takes any number of input files and a complex filter description, then producing the output.

• Is it posible to add an HTML page as an overlay in a RTMP stream using Nginx and FFMPEG ?

  4 août 2021, par tanowalla

  I have already installed Nginx on a EC2 instance (Ubuntu 18.04) for livestreaming to Youtube using RTMP. I want to setup a HTML page with a world clock and transparent background.

  


  I installed Nginx using this tutorial.

  


  https://www.scaleway.com/en/docs/setup-rtmp-streaming-server/

  


  Would it be possible to load the HTML page using NGINX and FFMPEG so i can overlay it over the RTMP livestream incoming from a camera and push it to Youtube ?

  


  I hope someone gets the idea, i apologize for my english, it is not my native language and have really no idea if this is even possible.

  


  Thank you very much in advance.

  


• FFmpeg : create data streams in MP4 container

  28 mars 2022, par Soeren

  Is there a way to make FFmpeg create data streams in MP4 or Quicktime (.mov) containers ? I have tried -attach ... (works fine for Matroska containers, but not MP4/MOV) or -codec bin_data, but to no avail.

  


  -attach ... technically creates streams with codec type "attachment", which are different from data streams. And while FFmpeg isn't smart enough to directly create data streams in containers where attachment streams aren't supported (ie. MP4), a two-step approach works :

  


  ffmpeg -i <some media="media" file="file"> -attach <some file="file"> -metadata:s:2 mimetype=<data mime="mime" type="type"> -map 0:v -map 0:a -codec copy attached.mkv&#xA;ffmpeg -i attached.mkv -codec copy attached.mp4&#xA;</data></some></some>

  


  The first command creates a Matroska file that contains a stream with codec_type=attachment. The second command then simply re-packages this into an MP4 container, turning the attachment stream into a data stream (codec_type=data). So the question is : could this be combined into a single step ?