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• Use WebRTC/GetUserMedia stream as input for FFMPEG

  10 février 2020, par ApplowPi

  I’m recording my screen with gerUserMedia and get my video & audio stream. I’m then using WebRTC to send/receive this stream on another device. Is there any way I can then use this incoming webrtc stream as an input for ffmpeg by converting it somehow ?

  Everything I’m working with is in javascript.

  Thanks in advance.

• hwframe : Allow hwaccel frame allocators to align surface sizes

  22 juin 2017, par Anton Khirnov

  hwframe : Allow hwaccel frame allocators to align surface sizes
  Hardware accelerated decoding generally uses AVHWFramesContext for pool
  
  allocation of hardware surfaces. These are setup to allocate surfaces
  
  aligned to hardware and hwaccel API requirements. Due to the
  
  architecture, av_hwframe_get_buffer() will return AVFrames with
  
  the dimensions set to the aligned sizes.
  This causes some decoders (like hevc) return these aligned size as
  
  final frame size, instead of cropping them to the video’s actual
  
  dimensions. To make sure this doesn’t happen, crop the frame to the
  
  size the decoder expects when ff_get_buffer() is called.
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavcodec/decode.c

• Using FFMPEG to overlay 2 concat-demux videos

  10 juin 2021, par marco

  I am making a screen recording software that captures gestures/mouse moves as coordinates+timestamps, and would like to overlay those on the screen recording. I have a folder of "Frames" that have a red circle and the rest transparent that correspond to the gestures.

  


  The way I initially got it working was to use concat-demux to generate a video of the gestures, and then I overlay it with ffmpeg by chromakeying out the black background and overlaying it, but that is very slow.

  


  Is there a better/faster way to do it that maybe doesn't make an intermediate video that I have to chromakey ? I have access to the timestamps of the gestures as well as the duration these frames should stay on screen.

  


  my pipeline :

  


  Screen Frames w/ Timestamps+durations --> Concat-demux --> ---------------------------+
                                                                                      |
Gesture Logs --> Frames w/ timestamp+duration --> Concat-demux ---> chromakey --+     |
                    (has transparency)        (loses transparency)              |     |
                                                                                V     V
                                                                               Overlay
                                                                                  |
                                                                                  V
                                                                             Final Video


  


  Example frame from gestures which is the foreground
(The white is transparent)

  


  The background has no transparency as it is a computer background

  


  The command I used to combine the videos I generated is :
ffmpeg -i gestures.mp4 -i screen.mp4 -filter_complex '[0]chromakey=0x000000:.1[bk];[1][bk]overlay' output.mp4