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• FFMPEG - Flaky internet for streaming, fallback stream or image

  15 juillet 2016, par jonathan tan

  I am using NGINX to receive rtmp and output to hls.

  rtmp {
  
      server {
  
          listen 1935;
  
          ...
  
          application rtmp {
  
              live on;
  
              ...
  
              exec ffmpeg -re -i rtmp://127.0.0.1/rtmp/$name -threads 1 -c:a aac -ac 1 -strict -2 -b:a 64k -c:v libx264 -profile:v baseline -g 10 -b:v 300K -s 480x240 -f flv rtmp://127.0.0.1/hls/$name;
  
          }
  
          application hls {
  
              live on;
  
              hls on;
  
              hls_path /tmp/hls;
  
              ...
  
          }
  
      }
  
  }

  My stream comes from Flash Media Live Encoder. But sometimes I have flaky internet because my connection comes from mobile. Sometimes internet drops for 3-5 seconds every 5 minutes. But this is enough to disrupt the stream. Is it possible for me to make it run continuously even when my FMLE is disconnected ?

  I am thinking of executing an FFMPEG from the server box to stream continuously an image as a fallback when FMLE is disconnected, then combine the 2 RTMP streams. Perhaps favoring the one from FMLE if available, and the other as fallback. But I am not sure how to combine using FFMPEG.

  Or is there another hack I can try ?

• Inconsistent Rotation of Output Video OpenCV

  27 avril 2021, par user530316

  I am reading in mobile videos shot on an iphone (.MOV format). When the video is shot upright, ffmpeg meta data states the video frames are rotated 90 clockwise. When I read the video in with opencv as a .MOV and then outwrite again with opencv as a .mp4, both the input and output videos appear upright. Note I display the video frames using opencv via a while loop :
 cap = cv2.VideoCapture("video.MOV")

  


  ret,frame=cap.read()

  


  while ret:
    cv2.imshow('',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
    ret,frame = cap.read()
cap.release()
cv2.destroyAllWindows() 


  


  This is not the problem. The problem is that when the same video is run on another machine with the same os and same virtual environment, the videos come out rotated by 90 degrees. Any reason this should happen ?

  


  Both machines are using opencv-python version 4.5.1, ffmpeg 4.2.2, and ffmpeg-python 0.2.0.

  


• Ffmpeg hardware acceleration unsupported formats betwen tranpose and auto_scaler_0

  11 août 2021, par Eduard6421

  I am trying to develop a transoding service which makes use of nvidia hardware acceleration capabilities ( The gpu used in this process is a Tesla T4) ; I want to generate a mpeg-dash playlist for my video so that i can stream it ;

  


  ffmpeg -y -hwaccel cuda -hwaccel_output_format cuda -i mobil1.mp4 -c:v h264_nvenc -c:a aac  \
-map v:0 -b:v:0 1000k -maxrate:0 1500k -bufsize:0 2500k -filter:v:0 "scale_npp=1920:1080:force_original_aspect_ratio=decrease" -map 0:a -b:a 128k \
-f dash dash.mpd


  


  But when mobile videos are uploaded ( which have rotation metadata ) I encounter the following error :

  


  Impossible to convert between the formats supported by the filter 'transpose' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  


  How can i solve this issue ?