Recherche avancée

Sur d’autres sites (5334)

• Live Video Chat for iPhone and HTTP Live Streaming

  14 janvier 2024, par mayuur

  I want to make an app which has video chat functionality for iPhone. But after many searches, I am still not able to find any successful results. Is there any public or even for that matter, private API available for doing this on iPhone ? If you have an YES answer, please help me.

  


  Basically, what I want is to read the streams of the video on both the devices connected for chatting. Please help me if you can.

  


  p.s - I have already checked iDoubs but it failed and always shows some unknown problem and for that reason, doesn't allow me to connect to anyone.

  


  ALSO : The suggested method I have found is via HTTP Live Streaming. But, in that too, I have multiple doubts.

  


  1.) I need to find how do I upload my video from iPhone to the HTTP server from where I would be broadcasting ?

  


  2.) Can you please post something related to setting up the server ? How do I feed the video to the FFMPEG Server ?

  


  Mainly, I need to find the upload method. I am right now simply sending hex-code in the form of NSDATA to the server and I am stuck there. The main problem is, It is live. How do I handle that ?

  


  It would be best, if you could help me make the iDoubs work properly.

  


• FFmpeg on iPhone - Modifying Video Orientation

  6 avril 2015, par Matthew McGoogan

  I’m messing with h264 videos loaded with FFmpeg on the iPhone 3GS. The problem is any videos recorded in "Portrait" orientation have a transformation matrix applied to them causing them to display rotated 90 degrees counter-clock.

  From what I understand thus far, I just need to modify the transform matrix in the ’tkhd’ atom. The problem is I am having trouble accessing or modifying this data. I checked out the FFmpeg implementation for :

  static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)

  which clearly shows how the matrix is accessed in avformat but when I try to access the header bytes using the same functions I am not getting any rational values. Even if I were to successfully pull the matrix I’m not sure how to replace it ? FFmpeg has functions for retrieving and appending to the track header but nothing for replace it seems ?

  Any help would be greatly appreciated.

  Thanks,
  Matt.

• Double subtitles when hardcoding from .mkv container

  4 novembre 2022, par Goran Hinic

  I'm trying to hardcode subtitles into a file that's in .mkv container, using one of the subtitle strams from the container. I want subtitles to have a black background on them. I'm also trying to keep 10bit encoding and preserve high quiality. Result is ok, except that all subtitles are doubled. So there is a layer of good subtitles in white on black background, and also, half of the font size down, same subtitles in black. Can someone point out the issue with my command ?
Thank you.

  


  Ran this command :

  


  


  ffmpeg -i movie.mkv -vf "subtitles=movie.mkv:si=0:force_style='OutlineColour=&000000000,BorderStyle=3,Outline=3,Shadow=0,MarginV=20'" -c:v libx265 -crf 23 -preset slow -x265-params profile=main10 -c:a copy movie_subs.mkv

  


  


  Expected : White subtitles on black background
Actual : White subtitles on black background with black subtitles half font size down