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• AVPlayer won't play audio files from FFMPEG

  18 janvier 2021, par Marcus

  Before requesting audio data AVPlayer requests byte range 0-1 from FFMPEG.

  


  FFMPEG gives a 200 response, but AVPlayer requires a 206 response.

  


  This results in the request failing and audio can't be played.

  


  Expected behavior :
Play tracks when streaming through ffmpeg

  


  Current behavior : When trying to stream with ffmpeg we get "Operation Stopped"

  


  Sample FFMPEG command :

  


  ffmpeg -i "/path/to/audio/track.mp3" -vn -strict -2 -acodec pcm_u8 -f wav -listen 1 -seekable 1 http://localhost:8090/restream.wav


  


  Player Log :

  


  Error Domain=AVFoundationErrorDomain Code=-11850 "Operation Stopped" UserInfo={NSLocalizedFailureReason=The server is not correctly configured., NSLocalizedDescription=Operation Stopped, NSUnderlyingError=0x600003bcc4b0 {Error Domain=NSOSStatusErrorDomain Code=-12939 "(null)"}}
!av_interleaved_write_frame(): Broken pipe

!Connection to tcp://localhost:8090 failed: Connection refused

!Connection to tcp://localhost:8090 failed: Connection refused

!Connection to tcp://localhost:8090 failed: Connection refused

!Error writing trailer of http://localhost:8090/restream.wav: Broken pipe


  


  This error is defined by Apple as :

  


  +"The HTTP server sending the media resource is not configured as expected. This might mean that the server does not support byte range requests."


  


  And summarised nicely in this StackOverflow post :

  


  when AVPlayerItem receive a video URL , it do the following task:

    Send a bytes request HTTP Request, and range = 0 -1
    If the response code is 206 and return 1 bytes data, It do the 3th task, if not, AVErrorServerIncorrectlyConfigured error occurred.
    continue send other HTTP Request, to download segment of All duration. and the response of VideoData code must be 206

In my situation , when send range[0-1] HTTP request, the server side give me a 200 OK response, So error occurred.


  


  Network Log :

  


  GET /file.wav HTTP/1.1
Host: localhost:1234
X-Playback-Session-Id: F72F1139-6F4C-4A22-B334-407672045A86
Range: bytes=0-1
Accept: */*
User-Agent: AppleCoreMedia/1.0.0.18C61 (iPhone; U; CPU OS 14_3 like Mac OS X; en_us)
Accept-Language: en-us
Accept-Encoding: identity
Connection: keep-alive

HTTP/1.1 200 OK
Content-Type: application/octet-stream
Transfer-Encoding: chunked


  


  Reproduce using this sample app :

  


  This can also be reproduced using standard ffmpeg and adding URL to local or remote ffmpeg URL

  


  Can we solve this by making changes to FFMPEG or AVPlayer ?

  


• FFMPEG throws error can not open display error for :1

  2 décembre 2020, par Krishna

  i am using Xvfb for starting X server on display 1 and x11vnc is also set for -display :1 along with fluxbox as window manager on Ubuntu 20.04 LTS like using below commands

  


  sudo -i -u ubuntu Xvfb :1 +extension GLX -screen 0 1440x1080x16 -ac sudo -i -u ubuntu DISPLAY=:1 fluxbox sudo -i -u ubuntu x11vnc -forever -display :1

  


  and when i run command : "ffmpeg -video_size 1440x1080 -framerate 25 -f x11grab -i :1.0 -c:v libx264rgb -crf 0 -preset ultrafast sample.mp4" it runs, however when i execute programmatically through processbuilder i see that in output buffer stream log file as :1 : Invalid argument and doesn't start recording,

  


  Command sent to processBuilder is like below :

  


  pb = new ProcessBuilder(ffmpegLocation, "-video_size", "1440x1080x16",
"-f", "x11grab", "-i", ":1", "-c:v libx264 -crf 0 -preset ultrafast", "-framerate","25", outputfilepath()) ;

  


  -FYI i have tried setting environmental variable as export DISPLAY=:1 , but still same error and also do i need to set the DISPLAY=:1, since i am setting up display number when i start Xvfb ? this used to work using avconv on older version of ubuntu but i am stuck on display issue for ffmpeg, anyone has idea how to resolve this ?

  


• Raspberry Pi cannot connect to IP camera, while Windows PC can ?

  28 novembre 2020, par gf000

  I have an IP camera (Provision ISR, DI-320IPS-VF, 2MP IR Vari-Focal Dome IP Camera). When I connect it to my router (it is a 10 or 12 years old TP-LINK TL-WR1043ND), it will immediately show up in "IP Manager" (this is a program by the manufacturer) on my Windows PC. If I double click on the camera's row, Internet Explorer opens up, and everything is working fine. On the same Windows PC, if I open VLC Media Player, and paste this URL : rtsp ://username:password@localipaddress:554/profile1
It works fine.

  


  I have also a "Raspberry Pi 4 model B 4 GB RAM", which is connected to the same router. If I open VLC Media Player, and I paste the same URL, it doesn't work. I also created an ffmpeg one-liner, which would take a photo, but that is also not working.

  


  My final goal would be to be able to take photos with that ffmpeg one-liner, on the Raspberry Pi.

  


  Maybe the Raspberry Pi is not powerful enough to handle the stream ? Or, could it be the problem that the IP-camera is sending H-264 / H-265 video stream, and the Raspberry Pi cannot handle it ?

  


  Thank you for your help. Any idea could help me.