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• avformat/udp : redesign threaded udp tx code

  25 mai 2016, par Michael Niedermayer

  avformat/udp : redesign threaded udp tx code
  This fixes partially completed send()
  
  Avoids holding the mutex during send()
  
  fixes race conditions in error handling
  
  removes copied non thread specific blocking code
  
  Fixes deadlocks on closure
  
  Fixes data loss on closure
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/udp.c

• Convert a Video that it can show with preview in telegram via bot api

  7 avril 2016, par siavashg

  I Have a video and i want to send it with telegram bot api by pytelegrambotapi library so i write this code for send video by bot :

  import telebot
  
  
  
  bot = telebot.TeleBot("TOKEN")
  
  
  
  @bot.message_handler(commands=['start'])
  
  def send_welcome(message):
  
      video = open('1.mp4', 'rb')
  
      bot.send_video(message.chat.id,video, duration=)
  
  
  
  bot.polling(none_stop=True)

  but I send a video and it has been sent successfully but telegram show black screen for my video like this picture
  Telegram With Black Scrreen preview of video.
  I think this is about the encoding . I found this site for encoding and it said the videos in telegram have specific format.

  Conditions to trim a video

  • Audio codec = mp4a
  • Video codec = supported by the device
  • Any side of the video more than 640px
  • Or if a side is less than 640px but video codec is h264

  Conditions to compress a video

  • Any side of the video over 640px
  • Audio codec = mp4a
  • A video encoder different than :
  • OMX.google.h264.encoder
  • OMX.ST.VFM.H264Enc
  • OMX.Exynos.avc.enc
  • OMX.MARVELL.VIDEO.HW.CODA7542ENCODER
  • OMX.MARVELL.VIDEO.H264ENCODER

  How can I send Video with blur image preview of that in telegram with telegram bot api ?

• recording video in real-time with OpevCV VideoWriter

  19 février 2016, par nick topper

  I have a few OpenCV projects that analyze video over USB, and in certain conditions must record the video stream to a file. People using my software complain that 10+ minute recordings yield video files that are about 20 seconds longer than they should be.

  I’m using openCV’s VideoWriter. Iv’e tried things like setting CV2_CAP_PROP_FPS to a very low setting, and iv’e tried getting the average frame rate over a few seconds to find a good setting for my frame rate of the output file. Still not close enough to real time for my needs.

  Does anyone know of a good way to make sure my video is recording close to real time ? Should I use something like time.sleep (in python) to cap my framerate ? Or is there a better way to do this ?