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• Merge commit ’80fefbed623491b92fe59ead99225f99c0d0ca08’

  4 octobre 2013, par Michael Niedermayer

  Merge commit ’80fefbed623491b92fe59ead99225f99c0d0ca08’
  * commit ’80fefbed623491b92fe59ead99225f99c0d0ca08’ :
  
    x86 : cpu : Restore some explanatory comments removed in 7160bb7
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavutil/cpu.h

• Writing Live-Multimedia-Application using OpenGL & Co. saving output to disc [closed]

  21 janvier 2013, par user1997286

  I want to write an application that does the following thing :

  • Getting Commands via ArtNET (DMX over Ethernet, a Control Protocol) for each object (called Layer)
  • each Layer could be one of the following : Live Camera Stream, Movie, Image
  • each layer could be translated, rotated or stretched
  • on each layer I can set filters (Like a Kaleidoscope Effect, Blur, Color Correction, etc.)
  • the rsulting video-stream is in the 3d-space
  • I want to display each part of the image on one Projector (in total up to 3 ones) using a TripleHead2GO (3 Projectors display a different region of my DVI-Output). Each Projecector-Image should have own Soft-Edge and Keystone parameters.
  • the resulting image will also be shown on a Preview-Screen with some Information overlay.

  I think all that should be possible with opengl and openal (for the movie audio)

  I think I'll use C++, OpenGL for Graphics, OpenAL for Audio, if needed ffmpeg for Video conversion, Ubuntu/Debian as OS.

  The software is used to do Multimedia-Shows on Concerts including Cameras & Co.

  All that should happen Live (On a FullHD output), Having i7 3770, GLX 670 and 16GB of Ram for at least 8 Layers. (4 Live-Images at once + Some Overlays like the Actors Name and some Logos)

  But now comes the question.

  Is it also Posible to do the following with that setting :

  • Writing the output Image with all the 3d translations to a Movie File (To Master a DVD later) with Audio
  • Mixing Audio from different Inputs & Files (Ambience Mics, Signal from the Sound Mixer, Playbacks from my own application) to more than one Mix (eg. one Mix for the Recording, one Mix for Live)
  • Stream that Output Complete or in Parts (e.g. the left Part of the Image) over the Network (For example, Projector 1 is near the Server, so I connect it using DVI, Projector 2+3 is connected to a Computer that receives the streams for that two projectors (with soft edge on each stream) and Screen 4 is outside the Concert Hall and shows the complete Live-Stream.
  • What GUI-Framework should I use for that ?
  • is it perhaps event performant enough to use Java for that ?
  • is it posible to use that mechanism for just rendering (eg. I have stored the cut points on Disc and saved every single camera stream to change some errors later or cut out some parts)

• Parsing splitted video with ffmpeg

  12 mai 2016, par mtomy

  I have video file split into few chunks. Split done and random file positions, but chunks are large enough.

  I need to parse every part with different instances of AVFormatContext. Chunks come one after another in right order. I think there are two options here :

  1. Being able to save and restore AVFormatContext state ;
  2. Save video file header (from first chunk) and attach it to every chunk.

  I tried both but no success. First approach requires to go too deeply beyond public API of ffmpeg. With second approach I am unable to merge header with new chunk so that ffmpeg can handle it.

  Can you help me with this ?

  Thank you.