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• Server side video mixing

  16 mars 2014, par Nicolas Goy

  I have a serie of video files encoded in mpeg2 (I can change this encoding), and I have to produce a movie in flash flv (this is a requirement, I can't change that encoding).

  One destination movie is a compilation of different source video files.

  I have a playlist defining the destination movie. For example :

  Video file        Position        Offset       Length 
  
  little_gnomes     0               0            8.5
  
  fairies           5.23            0.12         12.234
  
  pixies            14              0            9.2

  Video file is the name of the file, position is when the file should be started (in the master timeline), offset is the offset within the video file, and length is the length of the video to play. The numbers are seconds (in double).

  This would result in something like that (final movie timeline) :

                 0--5.23|--8.5|--14|--17.464|--23.2|
  
  little_nomes   **************
  
  fairies               *********************
  
  pixies                           *****************

  Where video overlaps, the last video to be added override the last one, the audio should be mixed.

  The resulting video track would be :

                 0--5.23|--8.5|--14|--17.464|--23.2|
  
  little_nomes   *******
  
  fairies               ***********
  
  pixies                           *****************

  While the resulting audio would be :

                 0--5.23|--8.5|--14|--17.464|--23.2|
  
  little_nomes   11111112222222
  
  fairies               222222211112222222222
  
  pixies                           22222222221111111

  Where 1 or 2 is the number of mixed audio tracks.

  There can be a maximum of 3 audio tracks.

  I need to write a program which takes the playlist as input and produce the flv file. I'm open to any solution (must be free/open source).

  An existing tool that can do that would be the simplest, but I found none. As for making my own solution, I found only ffmpeg, I was able to do basic things with it, but the documentation is terribly lacking.

  It can be any language, it doesn't have to be super fast (if it takes 30 minutes to build a 1h movie it's fine).

  The solution will run on opensolaris based x64 servers. If I have to use linux, this would work too. But windows is out of the question.

• 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

• ffmpeg- is there any limitation on number of drawtext filter used in a single command ?

  31 mars 2017, par hack

  i have to write different text on a number of images. The final filter command is quite large (> 500 draw text filters in a single command). I am writing this to a text file and using filter_complex_script to read it.
  If the number of frames and filter is small, it is working fine, but for a configuration with large number of images and draw text filters, it fails. Error is :

  Cannot find a valid font for the family Sans
  
  Error initializing filter 'drawtext' with args 'enable=between(n,180,180):fontsize=28:fontfile=C\:/Windows/Fonts/Arial.ttf:fontcolor=0x000000:text=109.0:x=581:y=527-th'
  
  Error initializing complex filters.
  
  No such file or directory