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• ffmpeg on Heroku, EC2 : TypeError : Cannot read property 'on' of undefined , ffmpegProc.stdout.on('data', function(data) { ^

  27 avril 2020, par Vikram Sapate

  I'm using ffmpeg.exe to convert video to audio .
On local machine it works fine but when deployed on heroku server it throws error like....

  



  /app/node_modules/fluent-ffmpeg/lib/processor.js:190
 ffmpegProc.stdout.on('data', function(data) {
^
TypeError: Cannot read property 'on' of undefined

  



  Please help me ....!

  


• Skipping incompatible libmp3lame.a while searching mp3lame (FFMPEG)

  19 octobre 2014, par trololo

  I want to compile ffmpeg with libmp3lame for my Android app. I’m using Virtual Machine with OS Debian.
  While compiling I recieve with message in Console.log file :

  skipping incompatible /home/sla/ffmpeg_build/lib/libmp3lame.a while searching mp3lame
  ...

  That’s why compilations doesn’t work properly.

  I’ve installed lame for debian using this code install.sh :
  (https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu)

  sudo apt-get install libmp3lame-dev
  
  mkdir /home/sla/ffmpeg_build
  
  mkdir /home/sla/ffmpeg_sources
  
  sudo apt-get install nasm
  
  cd /home/sla/ffmpeg_sources
  
  wget http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
  
  tar xzvf lame-3.99.5.tar.gz
  
  cd lame-3.99.5
  
  ./configure --prefix="/home/sla/ffmpeg_build" --enable-nasm --disable-shared
  
  make
  
  make install
  
  make distclean

  But it doesn’t work (lame compiles but ffmpeg - doesn’t).
  ffmpeg compiler says something strange.

  For ffmpeg I wrote flags :

  --export-cflags
  
  -I/home/sla/ffmpeg_build/include
  
  
  
  --export-ldflags
  
  -L/home/sla/ffmpeg_build/lib

  How to fix it ?

• Create a rolling X second webcam buffer in Linux, press button saves to file

  13 août 2016, par Grant Gibson

  I’m working on a webcam installation with an ’instant replay’ feature. The concept is basically this :

  1. Webcam captures live, 24/7
  2. When user presses a key, the last (previous) 30 seconds of video saves to a file
  3. I’ll then compress that video using something like FFMPEG and upload to a remote server

  I’m fine with step 3 and beyond, but I haven’t been able to find a solution that does the equivalent of a FIFO buffer for video streams [i.e. pretty much what the ’rewind live tv’ buffer on TiVo does].

  Does anyone know of a way to keep a rolling webcam video/audio buffer that can be exported to a file ?

  Design considerations :

  • I’m planning to use a standard webcam, but open to other suggestions
  • Recording would ideally be 1080p, 30fps
  • Recording must include sound
  • Linux hardware and OS can be specified in the answer, there are no existing pre-requisites. Raspberry Pi would be nice if that’s possible, but equally fine with a small Intel machine (e.g. NUC).
  • There’s no requirement to save the 24/7 stream, but it’s ok if that’s a by-product. So, storage permitting it can be saving to a file continuously for say 12 hours and just ’cat’ the last 30 secs to a separate file, if that’s an option ? But better would be the 30 sec rolling FIFO buffer that could potentially do the whole job in RAM.
  • The ’save instant replay’ button will eventually be a physical pushbutton rather than a keyboard key. However, I’ve got that side of things covered (if the solution is RPi I’d use the GPIO pins, if it’s an Intel box I’d probably use an Arduino in HID mode to simulate a keyboard press).