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• Deal with resolution changed while decoding ?

  30 juillet 2024, par TTGroup

  I'm using FFMPEG with C++ to read frames and decode them from RTSP Stream on IP Camera.

  


  Anything is ok, but while decoding, I try to change stream resolution config on IP Camera (ex : change from 1280x720 to 1920x1080).

  


  The result is av_read_frame() in while loop still read successful next frames (with new resolution) without error. So I can not detect that change to reinit buffer or reconnect stream to update other stream's information.

  


  av_read_frame() will read an AVPacket, If I can read resolution info in the AVPacket, then I can detect that change and reinit buffer. But I can't see any resolution info in AVPacket struct.

  


  How do I detect a resolution change while reading and decoding the stream ?

  


  ---

  


  I'm using many codecs as H264 and H265/H265+. This case happened with all 3 codecs above.

  


  In many cases, I also store the AVPacket for later playback, so there's no need for decode. I need to detect the resolution change immediately to be able to properly build header information to store on the HDD.

  


• Is there any (or possible) html5 player that play videos on different resolution without convertion the media file ?

  1er avril 2020, par In-my-country-we-dont-use-name

  I want to play videos on my website with a html5 media player.I found this for an example :

  



  https://plyr.io/

  



  but it needs different videos for every resolution with these codes :

  



   
                        
                        
                        


  



  I dont want convert media files with some convertion technologies for example ffMpeg, IF IT IS POSSIBLE.So, I want to learn how to play videos on different resolution without convertion.If you know a html5 player, you can suggest me.

  



  Its urgent.My company loses many thousand dollars everyday because of this problem.If we cant solve this, we cant save us from bankrupt.I dont want go to jail because of depts.

  


• Getting video dimension / resolution / width x height from ffmpeg

  17 octobre 2023, par David542

  How would I get the height and width of a video from ffmpeg's information output. For example, with the following output :

  



  $ ffmpeg -i video.mp4
...
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isomavc1
    creation_time   : 2010-01-24 00:55:16
  Duration: 00:00:35.08, start: 0.000000, bitrate: 354 kb/s
    Stream #0.0(und): Video: h264 (High), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 597 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
    Metadata:
      creation_time   : 2010-01-24 00:55:16
    Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 109 kb/s
    Metadata:
      creation_time   : 2010-01-24 00:55:17
At least one output file must be specified


  



  How would I get height = 640, width= 360 ?