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• ffmpeg show wrong with/height of video

  6 mai 2020, par boygiandi

  I have this video : https://media.gostream.co/uploads/gostream/9wkBeGM7lOfxT902V86hzI22Baj2/23-4-2020/videos/263a34c5a2fe61b33fe17e090893c04e-1587640618504_fs.mp4

  



  When I play it on Google Chrome, it's vertical video. But when I check with ffmpeg

  



  ffmpeg -i "https://media.gostream.co/uploads/gostream/9wkBeGM7lOfxT902V86hzI22Baj2/23-4-2020/videos/263a34c5a2fe61b33fe17e090893c04e-1587640618504_fs.mp4"


  



  It show video dimensions are 1080x1080

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.35.101
  Duration: 00:00:39.51, start: 0.000000, bitrate: 1577 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1080 [SAR 9:16 DAR 9:16], 1464 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
At least one output file must be specified


  



  And when I livestream this video to Facebook, it scaled vertical video into square form : https://imgur.com/a/A8dQ7j7

  



  How can I correct video size when livestream ?

  


• FFMPEG show audio frequency waves with border

  13 juillet 2020, par Nikhil Solanki

  I am trying to generate sine waves or audio frequency like using this command :

  


  ffmpeg -i combine2.mp4 -i image1.png -i song.mp3 -t 20 -filter_complex "[0]split=2[color][alpha]; [color]crop=iw/2:ih:0:0[color]; [alpha]crop=iw/2:ih:iw/2:ih[alpha]; [color][alpha]alphamerge[v1];
[1]scale=540:960, setsar=1[v2];
[2]showfreqs=s=540x100:mode=line:ascale=sqrt:colors=white|red[v3];
[v2][v3] overlay=main_w-overlay_w:main_h-overlay_h-10[v4];
[v4][v1] overlay=1" output_video2.mp4 -y


  


  This command shows frequency of audio with white colour only and also its not smooth as above image. So, how can I generate waves like above image smooth and bordered ?

  


  Output video :


  


• Use ffmpeg to show a webcam live stream in a browser

  20 juillet 2020, par Toast

  I have a webcam that is connected to a server and I'd like to view a live stream of it in a web browser.

  


  I'd like to include a video tag like this :

  


  <video></video>&#xA;

  


  What is an ffmpeg command that will send a video stream to browser clients ?
I managed to record a video to disk with this command :

  


  ffmpeg -f v4l2 -i /dev/video0 output.mkv


  


  I'm not sure if rtsp and ffmpeg are a good choice and I'm open for alternative suggestions.
I'm looking for a solution that is simple to setup and demo. Scalability and support for older browsers don't matter and audio isn't needed. I'd prefer a solution that sends compressed video instead of individual images (MJPG).