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• FFMPEG- force abortion on certain conditions

  18 juin 2023, par POL

  FFMPEG shows various errors, once in a while, during which the video is stuck or choppy. I couldn't find a way to fix it, but I figured that if I start the process again, it gets fixed.
The errors are like :
timestamp discontinuity for stream
New video stream with index 6

  


  This is what I run :

  


  ffmpeg -xerror -abort_on empty_output_stream+empty_output -fflags +discardcorrupt -http_persistent false -i URL -c:v libx264 -c:a aac -preset superfast -copyts -f mpegts udp://localhost:1937?pkt_size=1316


  


  How can I force FFMPEG to abort ?

  


• Error when trying to launch ffplay on Ubuntu server 16

  18 décembre 2019, par Nicolas

  For work I need to get a video+audio link working between a machine running Ubuntu server 16 and a client machine running Ubuntu 18.04.
  On the server side we have a webcam (with a microphone) and a speaker. The idea is that the client can see and hear what happens in front of the webcam, and can talk to whoever is next to the server.

  For this purpose, I run ffserver+ffmpeg on the server side to stream video and audio (that works, the client can see and hear what happens around the server), and the client also runs ffserver+ffmpeg on a different port, so that the server can use ffplay to hear what the client says.
  Unfortunately for some reason at the moment the server cannot run ffplay. I get the following error :

   # ffplay -probesize 32 -sync ext http://localhost:8090/camera.rm
  
     ffplay version 2.8.15-0ubuntu0.16.04.1 Copyright (c) 2003-2018 the FFmpeg developers
  
     built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
     configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enableopengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
     libavutil      54. 31.100 / 54. 31.100
  
     libavcodec     56. 60.100 / 56. 60.100
  
     libavformat    56. 40.101 / 56. 40.101
  
     libavdevice    56.  4.100 / 56.  4.100
  
     libavfilter     5. 40.101 /  5. 40.101
  
     libavresample   2.  1.  0 /  2.  1.  0
  
     libswscale      3.  1.101 /  3.  1.101
  
     libswresample   1.  2.101 /  1.  2.101
  
     libpostproc    53.  3.100 / 53.  3.100
  
   ALSA lib pcm_dmix.c:1029:(snd_pcm_dmix_open) unable to open slave
  
   Input #0, rm, from 'http://localhost:8090/camera.rm':    0B f=0/0   
  
     Metadata:
  
       title           : 
  
       author          : 
  
       copyright       : 
  
       comment         : 
  
     Duration: 01:00:00.00, start: 0.000000, bitrate: N/A
  
       Stream #0:0: Audio: ac3 (dnet / 0x74656E64), 22050 Hz, mono, fltp, 32 kb/s
  
       Stream #0:1: Video: rv10 (RV10 / 0x30315652), yuv420p, 640x480, 2048 kb/s, 24464 fps, 24464 tbr, 1k tbn, 1k tbc
  
   SDL_OpenAudio (1 channels, 22050 Hz): 
  
   No more combinations to try, audio open failed

  To be noted : ffplay has worked in the past on this server. The only modifications that were made are that I added some feeds and streams in the ffserver.conf, but they are not even used. I tried marking my additions as comments and repeating the test, but ffplay still doesn’t work.

  My ffserver.conf file is as below :

  HTTPPort            8090
  
  HTTPBindAddress     0.0.0.0
  
  MaxHTTPConnections 200
  
  MaxClients      100
  
  MaxBandWidth    500000
  
  CustomLog       -
  
  #NoDaemon
  
  
  
  <feed>
  
  File            /tmp/camera.ffm
  
  FileMaxSize     200M
  
  </feed>
  
  
  
  #<feed>
  
  #File            /tmp/test.ffm
  
  #FileMaxSize     200k
  
  #</feed>
  
  
  
  #<feed>
  
  #File /tmp/audio.ffm>
  
  #FileMaxSize 200M
  
  #</feed>
  
  
  
  <stream>
  
  Feed camera.ffm
  
  Format rm
  
  AudioBitRate 32
  
  VideoFrameRate 15
  
  VideoIntraOnly
  
  VideoBitRate 2048
  
  VideoBufferSize 2048
  
  VideoSize 640x480
  
  VideoQMin 5
  
  VideoQMax 51
  
  Strict -1
  
  </stream>
  
  
  
  #<stream>
  
  #Feed test.ffm
  
  #AudioBitRate 32
  
  #AudioChannels 1
  
  #AudioSampleRate 44100
  
  #VideoBitRate 512
  
  #VideoBufferSize 40
  
  #VideoFrameRate 24
  
  #VideoSize 640x640
  
  #VideoGopSize 12
  
  #VideoQMin 1
  
  #VideoQMax 15
  
  #</stream>
  
  
  
  #<stream>
  
  #Feed audio.ffm
  
  #Format rm
  
  #AudioBitRate 128
  
  #NoVideo
  
  #</stream>

  And I use the following commands :

  On the server side : ffserver -f /etc/ffserver.conf

  and : ffmpeg -f v4l2 -i /dev/video0 -f alsa -ac 2 -i hw:0 http://localhost:8090/camera.ffm

  and to receive audio : ffplay -probesize 32 -sync ext http://10.1.0.244:8080/audio.ra

  And on the client side : ffserver -f /etc/ffserver.conf

  and : ffmpeg -f alsa -ac 2 -i hw:0 http://localhost:8080/audio.ffm

  The two ffserver.conf files (on server and client) are identical, apart for the port which is different (8090 on the server and 8080 on the client).

  Does anyone have any idea why ffplay won’t start on my server ?
  Thanks,
  Nicolas.

• How to create an RTSP server to stream from webcam ?

  24 février 2021, par Dhananjay Chobhe

  I want to create an RTSP streaming server using my integrated webcam and later on using the same stream server to click pictures using java code. I did some research and there are several options available such as FFmpeg, wowza, etc but I don't know how to use them properly. I am using windows OS. I want the streaming server to be localhost. And i can use this link to actually take pictures in java.