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• Live Stream using .m3u8 and .ts files with iPhone as server

  26 février 2015, par Bhumit

  I am trying to accomplish a task to live stream from iPhone camera. I have done some research and found that i can use .m3u8 files for streaming live video with should contain .ts(Mpeg-2) files .

  Now the file which i have on my iPhone is .mp4 file and it does not work with .m3u8, so i figured out i will have to convert .mp4 to .ts for that , but i have not succeeded in doing so.

  I found that it is possible to convert video ffmpeg lib as mentioned in this article here. I have successfully imported ffmpeg library but not able figure out how can i use it to convert a video as i am using this for first time.

  One another thing apple documentation says

  There are a number of hardware and software encoders that can create
  MPEG-2 transport streams carrying MPEG-4 video and AAC audio in real
  time.

  What is being said here ? is there any other way i can use .mp4 files for live streaming without converting them from iOS ?

  Let me know if i am not clear, i can provide more information .Any suggestion is appreciated. I would like to know am i on a right path here ?

  EDIT

  I am adding more info to my question, so basically what i am asking is , we can convert .mp4 video to .ts using following command

  ffmpeg -i file.mp4 -acodec libfaac -vcodec libx264 -an -map 0 -f segment -segment_time 10 -segment_list test.m3u8 -segment_format mpegts -vbsf h264_mp4toannexb -flags -global_header stream%05d.ts

  How can i use ffmpeg library to do what this command does in iOS.

• Ramp- Slow Motion in IOS

  26 juin 2013, par 2vision2

  I have to do "ramp-slow motion" in a video file along with audio, in-between some frames and need to store the ramped video as a new video.

  Ref : http://www.youtube.com/watch?v=BJ3_xMGzauk (watch from 0 to 10s)

  From my analysis, I've found that AVFoundation framework can be helpful.

  Ref :
  http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/00_Introduction.html

  Copy and pasted from the above link :

  "
  Editing
  AV Foundation uses compositions to create new assets from existing pieces of media (typically, one or more video and audio tracks). You use a mutable composition to add and remove tracks, and adjust their temporal orderings. You can also set the relative volumes and ramping of audio tracks ; and set the opacity, and opacity ramps, of video tracks. A composition is an assemblage of pieces of media held in memory. When you export a composition using an export session, it's collapsed to a file.
  On iOS 4.1 and later, you can also create an asset from media such as sample buffers or still images using an asset writer.

  "

  Questions :
  Can I "ramp-slow mote" the video/audio file using the AVFoundation framework ? Or Is there any other package available ? If i want to handle audio and video separately, please guide me how to do ?

• avformat/movenc : use correct iTunes copyright atom

  3 avril 2018, par Timo Teräs

  avformat/movenc : use correct iTunes copyright atom
  Support for writing copyright metadata was added in commit bed4fc54c9
  
  for 3GP, MOV and iTunes metadata. 3GP and MOV cases are formally
  
  specified. However, iTunes format does not have specification, and
  
  it seems to have been assumed that it would use the same atom as
  
  MOV (both being Apple formats).
  However, Apple uses 'cprt' atom for iTunes metadata (do note that
  
  the iTunes 'cprt' encoding is generic iTunes ItemList atom, not
  
  the 3GP 'cprt' encoding. These are also inside different parent
  
  atoms).
  Most references trying to document iTunes atoms mention only
  
  the 'cprt' tag. See :
  
   - http://atomicparsley.sourceforge.net/mpeg-4files.html
  
   - http://mutagen.readthedocs.io/en/latest/api/mp4.html
  Same applies to other software supporting this tag. Most of them
  
  encode and decode only the 'cprt' atom.
  ffmpeg mov demuxer supports both atoms in this context. There are
  
  few pieces of other software that support similarly both 'cprt' and
  
  the incorrect '\251cpy' atom in this context. I believe they do it in
  
  order to read the ffmpeg encoded incorrect copyright atom.
  In light of the above this changes the copyright atom to 'cprt' as
  
  it seems to be supported univerally and is the correct atom to use.
  Signed-off-by : Timo Teräs <timo.teras@iki.fi>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/movenc.c