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• How to reduce latency in WebRTC streaming with ffmpeg [closed]

  14 septembre 2024, par Artem

  I have a backend written in Go that captures the screen using ffmpeg and streams it to the frontend via WebRTC. The goal is to reduce the latency in the stream.

  


  For WebRTC, I'm using the pion library, and the H264 codec. The implementation is based on this example.

  


  I’m not including the ffmpeg command since the question is more about WebRTC. Based on the logs, ffmpeg starts sending data fairly quickly (within half a second), and these bytes are sent to WebRTC immediately. However, the video does not start playing right away. I added some debug messages, and I can see that the bytes are being transmitted, but the video playback is delayed. It seems like WebRTC has some sort of buffer that needs to fill up before the video starts playing.

  


  The delay is more noticeable when using -framerate 5 with ffmpeg. If I increase the framerate to 25, the delay is much smaller, which aligns with the buffer theory, as more frequent data transmission seems to reduce the buffer filling time. However, I would prefer not to increase the framerate, as this would increase CPU usage.

  


  I experimented by sending more data as follows :

  


  rtc.videoTrack.WriteSample(media.Sample{Data: nal.Data, Duration: time.Second}) 
rtc.videoTrack.WriteSample(media.Sample{Data: nal.Data, Duration: time.Second}) 
rtc.videoTrack.WriteSample(media.Sample{Data: nal.Data, Duration: time.Second}) 


  


  This did reduce the delay, but it naturally caused errors in the video (my goal was to understand whether the delay was related to the amount of transmitted data).

  


  Could you please advise if there's something that can be done to address this issue ? Is there any way to configure the Pion library, or do you have any other ideas ?

  


  Thank you !

  


• ffmpeg - trying to output timecodes in CSV of segments between blacks

  20 juin 2022, par Soapa Tune

  I would be so glad to have some help with this.

  


  I have video rushes in this form : black > sequence > black > sequence...

  


  I need the start/end timecodes of each sequences (no black) to create segments on another software so I wondering if it's possible with the blackdetect filter of FFmpeg to output only the sequences data in a csv file. No problem with the simple command line to have the blacks but I'm still at this point with unsuccess others test.

  


  The goal is automate this for multiple files by import the csv in a RPA.

  


  Thank you very much.

  


• Ways to create animations in python ?

  21 mai 2017, par Allison123

  What is the best way to create a small animation in python ?
  So far, I have tried : tkinter and FuncAnimation (from animation in matplotlib- this is what is used in A Student’s Guide to Python for Physical Modeling).

  The goal is to make a set of simple animations, but FuncAnimation is having me install apt-get so that I can get ffmpeg so I can run the animation. It seems like a lot of downloading, which I don’t prefer if there is a similarly powerful alternative.

  If possible, I was hoping to integrate these animations into Pygame at a later time. Will that be possible ?

  YES, this is a subjective question, but I am looking for guidance from experienced python animators. What are the objective strengths and weaknesses of different methods of animating in Python ?