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• Revision 420f58f2d2 : VP9 common for ARMv8 by using NEON intrinsics 11 Add vp9_idct16x16_1_add_neon.c

  31 janvier 2014, par James Yu

  Changed Paths :
   Delete /vp9/common/arm/neon/vp9_idct16x16_1_add_neon.asm

  
   Add /vp9/common/arm/neon/vp9_idct16x16_1_add_neon.c

  
   Add /vp9/common/arm/neon/vp9_idct16x16_1_add_neon_asm.asm
  (from /vp9/common/arm/neon/vp9_idct16x16_1_add_neon.asm
  :030ca4d0e59c68a54e6eb02cea4ab3fdc498d048)
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/vp9_common.mk

  
  
  VP9 common for ARMv8 by using NEON intrinsics 11

  Add vp9_idct16x16_1_add_neon.c
   vp9_idct16x16_1_add_neon

  Change-Id : I7c6524024ad4cb4e66aa38f1c887e733503c39df
  Signed-off-by : James Yu <james.yu@linaro.org>

• How to efficiently split a large video into multiple parts using Python ?

  7 décembre 2023, par Oleksandr

  I have large video files ( 1.5 GB) and a list of time intervals in seconds, represented as [(1.3, 2.6), ..., (433.1, 455.2)].

  &#xA;

  The objective is to split the video into segments based on the specified time intervals. Currently, I am using the ffmpeg-python library for this task, as shown below :

  &#xA;

  import ffmpeg

parts = [(1.3, 2.6), ..., (433.1, 455.2)]

for index, part in enumerate(parts):
    file_name = f"video{index}.mp4"
    start_time, end_time = part
    
    input_file = ffmpeg.input(movie_path, ss=start_time, to=end_time)
    input_file.output(file_name).run()


  &#xA;

  That works, but it is relatively slow, processing only 1-2 segments per second.

  &#xA;

  What is a more efficient way or library that can potentially load the entire video into memory and perform the cutting operation with multiple outputs or something like that ?

  &#xA;

• Live streaming video on multiple platforms [closed]

  4 mars 2019, par Nikolay Nikolov

  I want to build an application similar to Twitch/YouTube, which mainly offers two things (and a couple of other, but they are not related to the question) - to record and send live streams and to watch other people’s live streams. Basically, if I wanted to build Twitch, where would I start in terms of protocols and back-end libraries for the processing and sending/receiving of video segments (more detailed questions follow) ? I am new to the video streaming software development and need a bit of guidance on where/how to start.

  Here are the details/requirements :

  • Video and audio
  • Scalability and low latency are more important than supreme quality
  • Adaptive bit-rate
  • No services like Wowza and such (I am willing to build the whole structure)
  • Has to work on iOS and Android (Desktop support is not as important)
  • The users should be able to watch every stream and every user should be able to stream through his camera
  • VOD is not as important
  • Going back in the stream is not as important

  If I have it right, this is how the whole process should work :

  • Android/iOS camera records video
  • Simultaneously the app saves every x seconds as a single segment and sends it to the server
  • Server processes the video in different bit rates and saves them
  • Another user requests stream based on the bandwidth of its internet connection
  • Server responds with a playlist of segments and sends each new chunk of video to the user

  Questions :

  • What protocols should I be using (HLS, MPEG-DASH, WebRTC, RTSP, etc.) and do these protocols have implementations on Android/iOS or do I have to implement them myself ?
  • What books/other resources would you recommend ?

  Thank you very much for reading my question and I look forward to reading your answers !