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• Mobile Camera live audio/video streaming and encoding

  7 juin 2015, par Strikecounter2

  I know this question has been asked a couple of times, but I still haven’t found the right answer for my question.

  I would like to code an app that is able to live-stream audio and video while the content is being recorded and then uploaded to a server. I’d prefer to have my own back-end using Parse, because I want a high scalability. I know that the video has to be encoded to a h.264 codec and the audio to an AAC codec, but I don’t know how to achieve this. I have heard of the FFmpeg framework, but I am not sure if I would violate their license if I distribute my app or even sell it to somebody else.
  I would then like to receive the stream from the server to open it on the iPhone/android phone.

  They key requirements would be :

  • Low Latency
  • About 24 fps
  • Audio/Video in sync
  • No buffering while watching

  I would like to use Swift as a programming language, but if there is no way to use a swift-wrapper for any frameworks I would focus on Objective-C too.

  I am willing to learn everything that is needed, but I don’t know where to start.

• ffmpeg convert any user video file to run on mobiles h264 mp4

  24 octobre 2014, par tobros91

  So, i have kind of accepted this task on work but im really not sure if its possible.

  We are going to build a website where users can upload videos from their computers and mobile phone browsers. The video files can be a large range of aspect ratios, width, height, codex and file formats.

  I will have access to ffmpeg from php exec command on a web server.

  Is it possible to use this to convert the user files to one file format that works on computers, android and iphone.

  The requirements is that we can set a max width, to witch the video will be scaled, dynamically to match height.

  Does anyone know is this can be done, and be done in a reasonable amount of time. Will do project on 2 days. And if so some pointers in the right direction would be nice.

• FFMPEG eats all the memory

  19 mai 2021, par Abhinandan Chakraborty

  Probably one of the most cliche question but here is the problem : So I have a Ubuntu Server running as an isolated machine only to handle FFMPEG jobs. It has 4 vCPU, 4GB RAM, 80GB storage. I am currently using this script to convert a video into HLS playlist : https://gist.github.com/maitrungduc1410/9c640c61a7871390843af00ae1d8758e This works fine for all video including 4K recorded from iPhone. However, I am trying to add watermark so I changed the line 106 of this script

  


  from :

  


  cmd+=" ${static_params} -vf scale=w=${widthParam}:h=${heightParam}"


  


  to :

  


  cmd+=" ${static_params} -filter_complex [1]colorchannelmixer=aa=0.5,scale=iw*0.1:-1[wm];[0][wm]overlay=W-w-5:H-h-5[out];[out]scale=w=${widthParam}:h=${heightParam}[final] -map [final]"


  


  Now this works flawlessly in videos from Youtube or other sources but as soon as I am trying to use 4K videos from iPhone, the RAM usage grows from 250MB to 3.8GB in less than minute and crashes the entire process. So I looked out for some similar question :

  


  

  1. FFmpeg Concat Filter High Memory Usage

  


  2. https://github.com/jitsi/jibri/issues/269

  


  3. https://superuser.com/questions/1509906/reduce-ffmpeg-memory-usage-when-joining-videos

  


  4. ffmpeg amerge Error while filtering : Cannot allocate memory

  


  


  I understand that FFMPEG requires high amount of memory consumption but I am unsure what's the exact way to process video without holding the stream in the memory but instead release any memory allocation in real-time. Even if we decide to work without watermark, It still hangs around 1.8GB RAM for processing 5 seconds 4K video and this create a risk of what if our user upload rather longer video than it will eventually crash down the server. I have thought about ulimit but this does seem like restricting FFMPEG instead of writing an improved command. Let me know how I can tackle this problem. Thanks