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• Fixing MP3 duration (stop) with ffmpeg or another library [closed]

  9 janvier 2024, par knagode

  I have a mp3 file (which is concatenated from 2 files. First file is 15 seconds long, second file is 2 minutes long).

  


  ffmpeg -i "concat:first.mp3|second.mp3" -acodec copy -y final.mp3


  


  I noticed that generated file only plays for 15 seconds on some mobile devices or in iTunes. It seems like meta data is not propery stored on concatenated file even thought ffprobe returns valid info.

  


  In iTunes I found that there "stop" attribute but I do not know how can I remove it programatically :

  


  

  


  Any idea how to deal with this ?

  


• ffmpeg convert image sequence into h264 Constrained Baseline

  18 juillet 2020, par Bernhard Bodenstorfer

  When I convert a 352×640 image or sequence into a video, I successfully use the command

  


  ffmpeg -r 1/10 -i 0_%02d.bmp -vcodec libx264 -vf fps=29.68 -metadata:s:v:0 rotate=270 -y 00_video.mp4


  


  Unfortunately, the mobile device to show the video only supports Constrained Baseline profile. So I try to add the option -profile:v baseline and ffmpeg fails and tells me :

  


  


  Error initializing output stream 0:0 — Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  


  


  I also tried fps=25 and no rotation flag in the metadata and some but obviously not infinitely many changes of image format and size ; all these attempts yield the same error.

  


  Any ideas what I could do ? I use ffmpeg version 4.2.4.

  


• How can I watch my video from a sdp file ?

  7 avril 2019, par Marco Peca

  I’m using ffmpeg to create a streaming. It works fine. I have a server and with ffplay I can watch my stream.
  My only (big) constraint is real time.

  I have to embed it into an HTML page accessible from mobile devices.
  I tried with HTML5 video tag but I can’t include sdp files into it.

  With ffmpeg I create a stream from my webcam. I have also created the sdp file but in HTML5 doesn’t work.

  The code is here :

  ffmpeg server :

  sudo ffmpeg -re -f video4linux2 -i /dev/video0 -fflags no buffer rtp://224.10.20.30:20000

  file.sdp

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 224.10.20.30
  
  t=0 0
  
  a=tool:libavformat 55.7.100
  
  m=video 20000 RTP/AVP 96
  
  b=AS:200
  
  a=rtpmap:96 MP4V-ES/90000
  
  a=fmtp:96 profile-level-id=1

  ffplay : (It works)

  ffplay file.sdp

  How can I view the stream in a browser ?