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• download hls from m3u8 file with a particular resolution with ffmpeg [on hold]

  22 octobre 2018, par C.J.

  hi i am a new member of this site after looking at this site for hours i found how to download HLS from a site and it works also. but one thing i could not find is if a particular site has available video in more than one resolution say 1280*720 and 1920*1080. so how do i tell FFMPEG to download 1280*720 and not 1920*1080. this is the code i tried.

  ffmpeg i "https://hsprepack.akamaized.net/videos/hotstarint/world/kwks6/1_2/master.m3u8?hdnea=st=1540178095 exp=1540179895 acl=/* hmac=ee2361306de510cf4f372c359b5ec21fd3d3b61d65b6f5e2f16259508e08c625" output.mp4

• How I can receive MJPEG stream via RTSP with resolution more than 1080p

  21 septembre 2018, par chuchuchu

  There is a problem :
  When I get a video stream with a resolution of 1080 and below - everything is fine.
  But if I select a stream with a resolution higher than 1080 on the camera, an error occurs.
  FFMPEG :

  [mjpeg @ 0x7f5488003e40] [IMGUTILS @ 0x7f5494acb4f0] Picture size 0x0 is invalid

  If I open a stream in the player I get a disparate image :

  [mjpeg @ 0x7fd9f8043b20] error y=91 x=16
  
  [mjpeg @ 0x7fd9f8043b20] error dc

  I repeatedly recompiled and reinstalled various versions of the ffmpeg, the problem is not solved.

  I suspect that there is a restriction for video stream over 1080p, but I can not find any description or solution.
  And I found next string in rfc "RTP Payload Format for JPEG" :

  The maximum width is 2040 pixels.

  but it is dated 1998. I know for certain that this stream on the RTSP receives in the resolution I need, but I can not understand how.

  Please, tell me the way to the solution. I’m using Ubuntu 16.04 amd64.
  Perhaps there is an alternative way to receive a rtsp-stream without using a ffmpeg ?? Since all ways known to me are using ffmpeg.

• FFmpeg - Change resolution of the video with aspect ratio

  18 septembre 2024, par Arthur

  all.

  



  How to change resolution of the video with aspect ratio with FFmpeg ?

  



  There are options 
http://manpages.ubuntu.com/manpages/oneiric/man1/ffmpeg.1.html

  



         -s size
       Set frame size. The format is wxh (ffserver default = 160x128,
       ffmpeg default = same as source).  The following abbreviations are
       recognized:


  



  and

  



         -aspect aspect
       Set the video display aspect ratio specified by aspect.

       aspect can be a floating point number string, or a string of the
       form num:den, where num and den are the numerator and denominator
       of the aspect ratio. For example "4:3", "16:9", "1.3333", and
       "1.7777" are valid argument values.


  



  For example, I have two input videos :

  



  

  • with 200*400 resolution

  


  • with 400*700 resolution

  


  



  I need to make output video with 100*200 resolution.

  



  If I will run ffmpeg with -s 100x200, then second video will have bad aspect ratio.

  



  How can I limit output video by width, with auto aspect ratio by height ?

  



  For example, I want specify for the output video only width 100px and ffmpeg must automatically calculate height with right aspect ratio.

  



  For first video it will be :

  



  200/100=2

  



  400/2=200

  



  Ie 100x200

  



  For second video it will be :

  



  400/100=4

  



  700/4=75

  



  Ie 100x75

  



  Is it possible ?