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• ffmpeg and python usage

  23 février 2014, par user2063350

  I have an ffmpeg setup on my pc, which streams mp3 with this code :

  ffmpeg -f dshow -i audio="Input device" -c:a libmp3lame -f mpegts udp://192.168.1.2:7777

  Also i have a server and I want my python script to run 24/7 on server and start/stop writing stream to mp3 file every time pc get's turned on/off. I need new file every time pc turns on (use time and date for filename for example) to bypass overwriting. Using python's subprocess module and ffmpeg I can save file on my server like this :

  subprocess.call('ffmpeg -y -i udp://192.168.1.2:7777 -acodec copy output.mp3')

  But I need condition, when to start recording(listen if 7777 port is reciving data or something like that), is it even possible to implement such thing, using python ?
  P.S. Sorry for my bad English.

• stream vlc playlist trhough ffmpeg to rtmp live streaming [on hold]

  24 février 2014, par TamilArivu

  i am just tried to stream my playlist mp4 file to my live stream. i am using play my playlist via vlc and also stream via vlc. i am using the following code

  vlc --playlist-autostart --loop  --playlist-tree http://xxxxx.com/test --sout '#transcode{vcodec=h264,vb=300,fps=25,scale=1,acodec=mp4a,ab=64,channels=2}:std{access=rtmp,mux=ffmpeg{mux=flv},dst=rtmp://xxxxx.com/xxx/xxx1}'

  the above code play the playlist file but the streaming is not work . when i am run this code in my ubuntu command prompt it's return the following error

  VLC media player 2.0.8 Twoflower (revision 2.0.8a-0-g68cf50b)
  
  [0x678d58] inhibit interface error: Failed to connect to the D-Bus session daemon: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
  
  [0x678d58] main interface error: no suitable interface module
  
  [0x678d58] main interface error: no suitable interface module
  
  [0x648108] main libvlc error: interface "globalhotkeys,none" initialization failed
  
  [0x648108] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
  
  [0x678d58] qt4 interface error: Could not connect to X server
  
  [0x678d58] skins2 interface error: cannot initialize OSFactory
  
  [0x678d58] [cli] lua interface: Listening on host "*console".
  
  VLC media player 2.0.8 Twoflower
  
  Command Line Interface initialized. Type `help' for help.
  
  > Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
  
  Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
  
  Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
  
  Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
  
  x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  x264 [info]: profile High, level 3.1
  
  x264 [info]: final ratefactor: 35.88
  
  x264 [info]: using SAR=109/160
  
  x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  x264 [info]: profile High, level 3.1
  
  [flv @ 0x7f6d09133500] Codec for stream 0 does not use global headers but container format requires global headers
  
  [flv @ 0x7f6d09133500] Codec for stream 1 does not use global headers but container format requires global headers
  
  [flv @ 0x7f6d09133500] Packets are not in the proper order with respect to DTS
  
  [0x7f6d08003808] avformat mux error: could not write frame (pts: 240002, dts: 40001) (pkt pts: 240, dts: 40) 

  how can i solve this problem

• How to playback RAW video and audio in VLC ?

  24 février 2014, par Lane

  I have 2 files...

  • RAW H264 video
  • RAW PCM audio (uncompressed from PCM Mu Law)

  ...and I am looking to be able to play them in a Java application (using VLCJ possibly). I am able to run the ffmpeg command...

  • ffmpeg -i video -i audio -preset ultrafast movie.mp4

  ...to generate a mp4, but it takes 1/8 of the source length (it takes 1 min to generate a movie for 8 min of RAW data). My problem is that this is not fast enough for me, so I am trying to playback with the RAW sources. I can playback the video with the VLC command...

  • vlc video —demux=h264 (if I don't specify this flag, it doesn't work)

  ...and it plays correctly, but gives me the error...

  [0x10028bbe0] main interface error : no suitable interface module
  [0x10021d4a0] main libvlc : Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
  [0x10aa14950] h264 demux error : this doesn't look like a H264 ES stream, continuing anyway
  [0x1003ccb50] main input error : Invalid PCR value in ES_OUT_SET_(GROUP_)PCR !
  shader program 1 : WARNING : Output of vertex shader 'TexCoord1' not read by fragment shader
  WARNING : Output of vertex shader 'TexCoord2' not read by fragment shader

  ...similarly, I can play the RAW audio with the VLC command...

  • vlc audio (note that I do not need to specify the —demux flag)

  ...so, what I am looking for is...

  1. How to playback the RAW audio and video together using the VLC CLI ?
  2. Recommendations for a Java Application solution ?

  ...thanks !