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• ffmpeg and 64 bit architecure

  16 avril 2015, par nevgauker

  there is a pretty old project i need to upload to the store.
  how old you ask ? 32 bit only ,no arc and no story board...

  since in this days in mandatory to make a single archive that support 32 and 64 build ...i decided to update the valid architecture of the project.
  i discovered that many frameworks do not support 64 bit and i have to update them . the most problematic is ffmpge..
  here i few things that i tried to do and fail :

  1. add ffmpeg as a static libary
  2. add ffmpeg using cocoa pods

  nothing helps...

  here are some of the errors i get :
  Undefined symbols for architecture arm64 :
  "_av_read_frame", referenced from :
  -[Demuxer readPacket :] in Demuxer.o
  "_av_malloc", referenced from :
  -[Streamer writePacket :] in Streamer.o
  "_av_register_all", referenced from :
  +[Streamer initialize] in Streamer.o
  "_avformat_write_header", referenced from :
  -[Streamer writePacket :] in Streamer.o
  "_avio_close", referenced from :
  -[Streamer dealloc] in Streamer.o
  "_av_new_stream", referenced from :
  -[Streamer writePacket :] in Streamer.o
  "_avformat_free_context", referenced from :
  -[Streamer dealloc] in Streamer.o

  any suggestion ?

  the only way i succeed is turn on the "build active architecture only" (and of course get rejected when i try to upload to the store)

  if you refer me to any shell script, please instruct me how to use it

  thanks

• Error : "from : can't read /var/mail/moviepy.editor" How to resolve ?

  23 mai 2017, par batman_rising

  I have a script using which I am editing a video, (extracting 10 clips from a video and then simply concatenating them), I am using moviepy python module as well as ffmpeg

  The script works perfectly when I run it from terminal,

  Now I wanted to run the same script on startup, so I added a path in /etc/rc.local
sudo python /home/startlord/myProject/run.py but the code doesn’t work.

  also, I tried another approach,
  sudo nano /etc/init.d/testRun and created the script executable sudo chmod 755 /etc/init.d/testRun
  but when I wanted to start the execution sudo /etc/init.d/testRun start I was getting this error

  from : can’t read /var/mail/moviepy.editor

  what should I do now ! I am using UP-board, please help, I am not from computer science background.

• Create an RTP/RTSP or HTTP stream using OpenCV frames

  1er avril 2018, par Vector

  I have a custom board which takes input stream from a IP camera and the application perform facial detection using OpenCV on the input video stream.

  My use case is to provide an output stream through network which will be accessible through VLC on any device connected in the same network.

  I tried writing OpenCV frames through VideoWriter :

  VideoWriter outStream("/home/user/frames/frame.mjpg", CV_FOURCC('M','J','P','G'), CAP_PROP_FPS, img.size(), true);
  
   if (outStream.isOpened()){
  
       outStream.write(img);

  and creating a stream using mjpg_streamer like :

  mjpg_streamer -i "input_file.so -f /home/user/frames" -o "output_http.so -w /usr/local/www -p 5241"

  But the above process shows a lot of latency.
  I can’t use imshow as my hardware does not have any video output port.

  Here is my code : https://pastebin.com/s66xGjAC