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• Preventing the python and ffmpeg heroku buildpacks from overwriting LD_LIBRARY_PATH

  3 mars 2014, par Simon

  I'm deployng a Django app to heroku, which requires ffmpeg. To accomplish this I am using heroku-buildpack-multi to install both heroku-buildpack-ffmpeg and heroku-buildpack-python, and all of that works fine. The problem is my that app also depends on django-pylibmc-sasl, python-memcached, pylibmc et al. which, as per usual, heroku senses and automatically installs libmemcached for me.

  Here's where something goes a little wrong. If I remove the custom buildpack everything runs fine (except for ffmpeg obviously). As soon as I add it in, however, while I can run ffmpeg, python fails on import pylibmc (or rather on import _pylibmc inside the module itself). After a amount of head-scratching I decided to have a look at the environment variables, here's what I got :

  With only the Python buildpack enabled :

  LD_LIBRARY_PATH=/app/.heroku/vendor/lib

  With both the Python and the ffmpeg buildpacks enabled :

  LD_LIBRARY_PATH=:vendor/ffmpeg/lib

  It looks like one or both of the buildpacks simply overwrites the other, or avoids setting the variable should it be already set. The ffmpeg buildpack seems to set LD_LIBRARY_PATH in a way that looks kosher to me, while the Python buildpack does a few things that I don't really understand the reason for.

  Solution

  Anyway, after manually overriding the library path using heroku config:set LD_LIBRARY_PATH=/app/.heroku/vendor/lib:vendor/ffmpeg/lib I am able to use both libmemcached and ffmpeg, but it doesn't feel too robust. What if something changes in one of the buildpacks path settings, or I add another buildpack - then I would have to manually edit the library path variable.

  Better solution ?

  So, while this is not really an urgent question at all, I simply would like to know :

  • Is there a better way of solving this issue ?
  • Might I have made some configuration error leading up to the path conflict ?
  • Should this be considered a bug in either of the buildpacks ?

• 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 !

• 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