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• FFMpeg - moving overlay smoothly across background - ex. on Youtube

  12 septembre 2017, par techr

  Can somebody help me out with this. I was able to create a sliding video overlay on top of a background screen and moved it from point a to point b. However, the resulting video produces choppy movement. The overlay moves step at a time instead of one continous motion. Here’s an example of the code :

  ffmpeg -y -stream_loop -1 -i b.mpg -i bg.jpg -filter_complex "
  
  [0:v]scale=320:240[vid];[1][vid]overlay=x='(180+(30-180)*(t-
  
  0)/60)*between(t,0,60)+(30+(290-30)*(t-60)/60)*between(t,60,120)':y='(120+
  
  (120-120)*(t-0)/60)*between(t,0,60)+(120+(30-120)*(t-
  
  60)/60)*between(t,60,120)'[out]" -map "[out]" -r 29.97 -aspect 4:3 -b:v 
  
  4000k -minrate 4000k -maxrate 4000k -bufsize 2000k -t 64 t.mpg
  
  
  
  Input #0, mpegvideo, from 'b.mpg':
  
  Duration: 00:00:32.34, bitrate: 4000 kb/s
  
  Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 720x480 
  
  [SAR 32:27 DAR 16:9], 4000 kb/s, 29.97 fps, 29.97 tbr, 1200k tbn, 59.94 tbc
  
  Input #1, image2, from 'bg.jpg':
  
  Duration: 00:00:00.04, start: 0.000000, bitrate: 19637 kb/s
  
  Stream #1:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 640x480, 
  
  25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
  Stream #0:0 (mpeg2video) -> scale
  
  Stream #1:0 (mjpeg) -> overlay:main
  
  overlay -> Stream #0:0 (mpeg1video)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000000002adc740] deprecated pixel format used, make sure you 
  
  did set range correctly
  
  Output #0, mpeg, to 't.mpg':
  
  Metadata:
  
  encoder         : Lavf57.73.100
  
  Stream #0:0: Video: mpeg1video, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-31, 
  
  4000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc (default)
  
  Metadata:
  
  encoder         : Lavc57.99.100 mpeg1video
  
  Side data:
  
  cpb: bitrate max/min/avg: 4000000/4000000/4000000 buffer size: 2000000 
  
  vbv_delay: -1
  
  warning, clipping 1 dct coefficients to -255..255repeated 2 timesnter

  Link to video here : https://youtu.be/EE_hrjy4ilg

• Stream RTSP from ONVIF general camera to Youtube

  4 septembre 2017, par Samul

  I have a wifi camera that uses RTSP/ONVIF protocol and after reading FFMPEG docs and some threads at Google I am trying to broadcast the stream to Youtube. So I started a broadcast at youtube and in my computer in ffmpeg I executed this command :

  ffmpeg -f lavfi -i anullsrc -rtsp_transport udp -i rtsp://200.193.21.176:6002/onvif1 -tune zerolatency -vcodec libx264 -t 12:00:00 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp://x.rtmp.youtube.com/live2/private_key

  The command above looks like it’s correct cause it ouputs constantly something like this :

  

  The problem is that at YOUTUBE it still says I am offline. Why ?

• Bash : bash script to download trimmed mp3 from youtube url

  25 août 2017, par Bhishan Poudel

  I would like to download the initially x seconds trimmed mp3 from a video url of youtube.
  I found that youtube-dl can download the video from youtube to local machine. But, when I looked at the man pages of youtube-dl, I could not find any trim options.

  So I tried to use the ffmpeg to trim downloaded mp3 file.
  Instead of doing this is two steps, I like to write one bash script which does the same thing.
  My attempt is given below.

  However, I was stuck at one place :
  "HOW TO GET THE VARIABLE NAME OF OUTPUT MP3 FILE FROM YOUTUBE-DL ?"
  The script is given below :

  # trim initial x seconds of mp3 file
  
  # e.g. mytrim https://www.youtube.com/watch?v=dD5RgCf1hrI 30
  
  function mytrim() {
  
      youtube-dl --extract-audio --embed-thumbnail --audio-format mp3 -o "%(title)s.%(ext)s" $1
  
      ffmpeg -ss $2 -i $OUTPUT_MP3 -acodec copy -y temp.mp3
  
      mv temp.mp3 $OUTPUT_MP3
  
      }

  How to get the variable value $OUTPUT_MP3 ?
  echo "%(title)s.%(ext)s" gives the verbatim output, does not give the output filename.

  How could we make the script work ?

  The help will be appreciated.