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• Chromakey filter to display transparent keyboard while recording game screen using ffmpeg

  31 janvier 2020, par captain_majid

  I’m trying to display a transparent keyboard like this one (he is using OBS studio) :
  https://www.youtube.com/watch?v=6RCXyh2aICY

  So I’m setting all "NohBoard v1.2.2" colors to green (0x00FF00), except the letters, then :

  ffmpeg -y -f gdigrab -framerate 30 -draw_mouse 0 -i title="NohBoard v1.2.2" keyboard.mp4
  
  ffmpeg -y -i keyboard.mp4 -c: png -vf "chromakey=0x00FF00:similarity=.200" keyboard1.mp4
  
  ffmpeg -y -i gameplay.avi -i keyboard1.mp4 -filter_complex "[1:v] scale=560x180 [kb]; [0:v][kb] overlay=x=W-w-520:y=H-h-0 [done]" -shortest -map [done] test.mkv

  Everything works great so far, but can I use 1 command for this ?

• Wowza RTMP to RTSP

  3 août 2016, par Nmas

  We’re using a Raspicam to stream live video to a client using Wowza Streaming Engine. We use FFMPEG to encode and send to Wowza and we can succesfully watch the RTMP stream using JWPlayer. This is the FFMPEG command used :

  ffmpeg -t 0 -s 320x240 -f video4linux2 -i /dev/video0 -b:v 250k -tune zerolatency -preset ultrafast -f flv -r 15 rtmp://wowzaaddress:1935/live/live

  To be able to watch the stream on mobile devices we want to use RTSP or HLS which Wowza provides links to, however when we use those links (provided on the Test Player) nothing happens and we can’t even open them to test for example in VLC. We have already added the extra ports on our web server to see if that was the problem and still didn’t work.
  Does anybody know what the problem is or what could we be doing wrong ?

• How do Iuse FFMPEG API to add AV_CODEC_ID_ASS stream to my MPEGTS video format

  31 juillet 2020, par Meir Ivry

  I want to add an ASS/SSA subtitle stream to my video format using FFMPEG API.

  


  The specification for that format is in the following link :
ASS file format specification
(http://www.tcax.org/docs/ass-specs.htm)

  


  I know how to that with video, where it compirsed of the following steps

  


  

  1. get the desired AVCodec

  


  2. create new AVStream

  


  3. create new AVCodecContext

  


  4. create the proper AVFrame for each raw video frame.

  


  5. use avcodec_send_frame to encode frame

  


  6. use avcodec_receive_packet to get the frame packets

  


  7. use av_interleaved_write_frame to write the packets

  


  


  My question is the same procedure applies to subtitles and, if so, how do I initialize the AVFrame ?
Moreover, is there more to know other than that ?

  


  Thanks.