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• Streaming images as video on the fly using ffmpeg and ffserver

  1er décembre 2017, par AstrOne

  I have an OpenGL application that renders a 3D scene, and in every frame, it captures the OpenGL frame buffer, and saves it to a series of files (frame_1.png, frame_2.png, etc). I want to convert those images into a video stream and serve/broadcast it. From what I have read so far one solution would be to use ffmpeg and ffserver.

  There are several similar questions on StackOverflow but each one is a bit different, and they don’t ask exactly what I want. For example there are solutions to generate videos (but not streams) from images. Some others generate streams but not "live" ones. And so on.

  • I want the generated frames to be streamed as soon as possible after they are created. This is because the OpenGL application is supposed to be interactive. Latter on, a remote user should be able to send events (mouse motions and clicks) and interact with the rendered 3D scene.
  • I don’t want ffserver to do any kind of buffering because there is nothing to buffer, the frames must be served immediately.
  • Given that the frames must be served immediately, I guess I could just write the frames on top of each other. However, in that case there will be a synchronisation problem because the ffmpeg may try to read the image before the OpenGL application has finished writing on it. Any thoughts on that ?
  • In case the ffserver and the OpenGL application share the same RAM and not just the filesystem, ideally, I would like to not use files at all for the communication. I guess for my OpenGL application I could use something like mmap or some sort of shared memory, but ffmpeg can’t read from some kind of shared memory, right ?

  I would be more than grateful if someone could advice me how I need to setup the ffserver and the ffmpeg command to meet the above requirements (especially the first one).

• Suggest an Android FFMPEG Media Player App Supporting SRT Protocol for Video Streaming [closed]

  12 décembre 2023, par ChanduGudimetla

  I am currently in search of an Android application that can serve as a receiver or media player utilizing FFMPEG over the SRT (Secure Reliable Transport) protocol. My primary goal is to receive a video stream from one device (Device A) and mirror the screen onto another device (Device B).

  


  Source Application : I am using StreamPack APK on Device A, which handles the encoding of data effectively. Requirement : I need a receiver application for Device B that can decode this stream.

  


  The key requirements are : It should leverage FFMPEG for decoding. It must support the SRT protocol to ensure secure and reliable video streaming.

  


• FFMPEG Jar Library and Executable [on hold]

  27 juillet 2017, par NPE

  Currently working on FFMPEG library to create timelapse-based video creator application. Our application build on Java Environment (*.jar) and will be running on server side.

  I used FFMPEG for video compression because JMF doesn’t support for video compression.

  After reading several question on SO and doing some research, I know FFMPEG can do video compression through this command

  ffmpeg -i a.mp4 -s 640x480 -b:v 512k -vcodec mpeg1video -acodec copy b.mp4

  Our FFMPEG version

  ffmpeg version N-86848-g03a9e6f Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 7.1.0 (GCC)
  
  
  
  windows environment (*.exe)

  My question,

  1. Is there any FFMPEG jar file or library so we can call inside from our application (our code) instead of using ProcessBuilder to call exe ?
  2. Is FFMPEG provide jar executable version ? After doing some research here I not found any executable jar. We need call executable jar like this java -jar FFMPEG.jar
  3. How to packed all jar on library so when we build application will not produce any lib folder.

  Anyway, thanks.