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• ffmpeg-X264 encode —BGRA to AVFrame(ffmpeg) and viceversa ? for IOS

  6 avril 2012, par Asta ni enohpi

  Am working Video Processing in IOS(iphone/ipod/ipad) Using Objective c. i am using AVFoundation Framework to Capture Video . i want to Encode/decode those video frame using ffmpeg-libx264. i have compiled ffmpeg-x264 lib for ios. i got kCVPixelFormatType_32BGRA from AVFoundation.

  my problem is
  1.How to convert kCVPixelFormatType_32BGRA to AVFrame for enode using avcodec_encode_video ?

  2.How to convert AVFrame to kCVPixelFormatType_32BGRA @ decode side from avcodec_decode_video2 ?

  Please help me to start above process or give path for working tutorial .Thanks in advance.

• RTSP to RTMP in iOS as Transcoding

  15 mars 2019, par Naman Sheth

  I am getting live feed from some IP camera as an RTSP url and then i want to convert it to RTMP.

  Here is two aspects that we have to implement

  1. What we convert from RTSP to RTMP is transcoding.
  2. I have my iPad/iPhone Camera that user can switch and add live feed to RTMP url at this point I want to stop RTSP feed. i.e. Encoding

  This all scenario want to do with FFMPEG

  I have searched on this url but not able to figure out in iOS

  ffmpeg -i "[your rtsp link]" -f flv -r -s -an "[Your rtmp link]"

  RTSP to RTMP streaming

  Thanks in Advance !

• 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