Recherche avancée

Sur d’autres sites (11822)

• How to speed up m3u8 to mp4 conversion using ffmpeg

  17 décembre 2022, par Sahil Bagdi

  I am downloading mp4 from m3u8 using ffmpeg

  


  ffmpeg -i "https://92vod-adaptive.akamaized.net/exp=1671307488~acl=%2F48b4b587-13d3-42f9-bfb9-8a0c92876523%2F%2A~hmac=66ce19e1dc862e0b718a3eb73b42f54bf83855db43831e146252adccf0dc6f1a/48b4b587-13d3-42f9-bfb9-8a0c92876523/sep/video/67e2046f,8f9cecb7,b83b6682,0f26a563,3c957583/audio/0b5e7d8c,5f37ccc0,60c393d7/subtitles/59401986-English%20%28auto-generated%29-en-x-autogen-cc/master.m3u8?subcache=1&external-subs=1&subtoken=38c45483ebf2c8238ec8504c20207a588d72f633f79608c00f5950d0300576f3&query_string_ranges=1" -c copy -map p:0 "Testing of Hypothesis.mp4"



  


  but it is taking too long, like my speed is 10 MBps(80 mbps) size is 300MB, should be done in 30 seconds, but it takes upto 5-10 minutes sometimes, now I know it does some converting thing

  


  My question is is there any way to increase its speed ??
I have CPU- AMD Ryzen 5600H and
GPU - NVIDIA RTX 3050

  


  Some help will be really appreciated

  


  I checked some nvidia encoding and decoding things from there official website and tried many things from there but always stuck at some error

  


• Video transcoding

  12 mai 2020, par avanjv

  I have successfully implemented video compression commands for android using FFmpeg with following command :

  



  ffmpeg -i input.mp4 -vf "scale=-1:height" -vcodec h264 -b:v 1000k -acodec mp3 output.mp4


  



  It reduces video file size substantially, though after compression video was not playing on some android devices, the issue was resolved by removing codec from the command

  



  ffmpeg -i input.mp4 -vf "scale=-1:height" -b:v 1000k output.mp4


  



  But the processing time is way too longer than expected.
I have found this official linkedin library for video transcoding
https://github.com/linkedin/LiTr

  



  Which can be used for changing resolution and/or bitrate of a video track(s). Has anyone used it ? I am new in this field, I couldn't figure out the methods to be used for scaling and adjusting bitrate of a video file for this lib (Litr). Any help with these methods ?

  


• EmguCV capture rtsp ip camera stream ffmpeg

  2 février 2018, par Mr Neo

  I am working with IP camera and EmguCV to detect person in an area.
  Everything is work normally with Highgui capture source.
  But with Arlo camera which use FFMPEG format, I am unable to get stream without any exception.
  Here is the code I have tried :

  if (capture == null)
  
          {
  
              try
  
              {
  
                  capture = new Capture("rtsp://<ip>:8554/live"); 
  
                  capture.ImageGrabbed += Capture_ImageGrabbed;
  
                  capture.Grab();
  
                  capture.Start();
  
              }
  
  
  
  
  
              catch (NullReferenceException exception)
  
              {
  
                  MessageBox.Show(exception.Message);
  
              }
  
              catch (TypeInitializationException exc)
  
              {
  
                  MessageBox.Show(
  
                     "Attention: You have to copy all the assemblies and native libraries from an official release of EmguCV to the directory of the demo." +
  
                     Environment.NewLine + Environment.NewLine + exc);
  
              }
  
  }
  
  </ip>

  and here is Capture_ImageGrabbed event which is not fired.

  private void Capture_ImageGrabbed(object sender, EventArgs e)
  
      {
  
          Mat image = new Mat();
  
          capture.Retrieve(image);
  
          picCAM.Image = image.Bitmap;
  
      }

  Thanks so much for your help !