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• Encoding 20MB flv video into mp4 aac using FFMPEG

  2 juin 2014, par Pus

  I have make a shell script for encoding flv video to mp4 video :

  shell_exec('/usr/local/bin/ffmpeg -y -i /destination/filename -c:a aac -strict -2 -b:a 128k -c:v libx264 -profile:v baseline -vf "movie=/img/logo.png [watermark];[in][watermark] overlay=10:10 [out]" /destination/filename.mp4 2>&1')

  I have issue while large size flv files, then it could not encode. In the case of 5 flv files with each 20MB could not encode. (I am trying to encode these 1 by one)

  Is there any fault in my script ?

• 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)

• Does ffmpeg rewrite the header after finish transcoding ? [closed]

  11 janvier 2013, par jAckOdE

  Our client sends a request to download a movie file from a server. As the server receives the request, it will start a ffmpeg process to transcode the movie. The output of ffmpeg is temporarily saved to harddisk. We dont want to make client to wait to download the file after transcoding finish, so we send output data as its generated.

  The problem is that ffmpeg seem to rewrite the output file header after finish transcoding, so the downloaded file (on client side) doesnt have correct file header, and player can not play it.

  My question is that there is any way to make ffmpeg not to rewrite the header ? What should be the solution for this ?

  EDIT : the command is to transcode to H264/AAC in mp4 container