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• ffmpeg build from source fails in docker container ?

  24 mars 2016, par John Allard

  I’m trying to make some changes to the ffmpeg source code (yes, I’m a masochist), and to start I booted an Arch Linux docker container, installed the requirements, downloaded ffmpeg source code, and tried to compile, but I’m getting some extremely odd errors.

  compile command :

  ./configure --bindidr=~/ffmpeg_build --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree

  Output :

  ./configure:unset:3338: no such has table element: mktemp
  
  pr: /tmp/ffconf.uQI7CeV.c: No such file or directory.
  
  pr: /tmp/ffconf.uQI7CeV.c: No such file or directory.
  
  pr: /tmp/ffconf.uQI7CeV.c: No such file or directory.
  
  pr: /tmp/ffconf.uQI7CeV.c: No such file or directory.
  
  ... (24 times)
  
  pr: /tmp/ffconf.uQI7CeV.c: No such file or directory.
  
  pr: /tmp/ffconf.r547UgWy.m: No such file or directory.
  
  ./configure:53378: parse error near '}'
  
  ==> ERROR" A failure occured in build()
  
      Aborting...
  
  The build failed.

  This doesn’t seem to be a problem with ffmpeg, more a problem with the container. If I check find /tmp -name ffconf\* I see that the files do exist and they contain

  extern int getrusage();
  
  int main(void){ getrusage(); }

  what in the hell is going on ? hash tabled ? mktemp not working ? files not being found ?

  edit-

  here is what is on the line numbers in the files that give the errors

  3338:configure - unset -f mktemp
  
  5338:configure - check_builtin gmtime_r time.g "time_t * time; strict tm*; gmtime_r(time, tm)"

  edit2 - Here’s the dockerfile (cloned from here https://hub.docker.com/r/greyltc/archlinux/ /dockerfile/)

  # Arch Linux baseline docker container
  
  # Generated on Sat Mar 19 14:26:28 GMT 2016 using code in this GitHub repo:
  
  # https://github.com/greyltc/docker-archlinux
  
  FROM scratch
  
  MAINTAINER Grey Christoforo <grey@christoforo.net>
  
  
  
  # copy in super minimal root filesystem archive
  
  ADD archlinux.tar.xz /
  
  
  
  # perform initial container setup tasks
  
  RUN setup-arch-docker-container
  
  
  
  # this allows the system profile to be sourced at every shell
  
  ENV ENV /etc/profile

• Installing ffmpeg on Heroku with Go (Golang) app

  17 novembre 2015, par Kevin Cantwell

  I have a Go app that uses ffmpeg bindings that I’d like to deploy on Heroku. I am able to install ffmpeg successfully using ddollar’s multi buildpack in conjunction with shunjikonishi’s ffmpeg buildpack and kr’s go buildpack. However, no matter what I try, the app fails on the call to pkg-config with the following output :

  $ git push heroku master
  
  Counting objects: 22, done.
  
  Delta compression using up to 8 threads.
  
  Compressing objects: 100% (20/20), done.
  
  Writing objects: 100% (22/22), 2.32 KiB | 0 bytes/s, done.
  
  Total 22 (delta 9), reused 0 (delta 0)
  
  remote: Compressing source files... done.
  
  remote: Building source:
  
  remote:
  
  remote: -----> Fetching set buildpack https://github.com/ddollar/heroku-buildpack-multi... done
  
  remote: -----> Multipack app detected
  
  remote: =====> Downloading Buildpack: https://github.com/shunjikonishi/heroku-buildpack-ffmpeg
  
  remote: =====> Detected Framework: ffmpeg
  
  remote: -----> Install ffmpeg
  
  remote:        DOWNLOAD_URL =  http://flect.github.io/heroku-binaries/libs/ffmpeg.tar.gz
  
  remote:        exporting PATH and LIBRARY_PATH
  
  remote: =====> Downloading Buildpack: https://github.com/kr/heroku-buildpack-go.git
  
  remote: =====> Detected Framework: Go
  
  remote: -----> Checking Godeps/Godeps.json file.
  
  remote: -----> Installing go1.5... done
  
  remote: -----> Running: godep go install -tags heroku ./...
  
  remote: # pkg-config --cflags libavcodec libavformat libavutil libswscale
  
  remote: Package libavcodec was not found in the pkg-config search path.
  
  remote: Perhaps you should add the directory containing `libavcodec.pc'
  
  remote: to the PKG_CONFIG_PATH environment variable
  
  remote: No package 'libavcodec' found
  
  remote: Package libavformat was not found in the pkg-config search path.
  
  remote: Perhaps you should add the directory containing `libavformat.pc'
  
  remote: to the PKG_CONFIG_PATH environment variable
  
  remote: No package 'libavformat' found
  
  remote: Package libavutil was not found in the pkg-config search path.
  
  remote: Perhaps you should add the directory containing `libavutil.pc'
  
  remote: to the PKG_CONFIG_PATH environment variable
  
  remote: No package 'libavutil' found
  
  remote: Package libswscale was not found in the pkg-config search path.
  
  remote: Perhaps you should add the directory containing `libswscale.pc'
  
  remote: to the PKG_CONFIG_PATH environment variable
  
  remote: No package 'libswscale' found
  
  remote: pkg-config: exit status 1
  
  remote: godep: go exit status 2
  
  remote:
  
  remote:  !     Push rejected, failed to compile Multipack app
  
  remote:
  
  remote: Verifying deploy...
  
  remote:
  
  remote: ! Push rejected to myvideoapp.
  
  remote:
  
  To https://git.heroku.com/myvideoapp.git
  
   ! [remote rejected] master -> master (pre-receive hook declined)
  
  error: failed to push some refs to 'https://git.heroku.com/myvideoapp.git'

  The command that fails is pkg-config --cflags libavcodec libavformat libavutil libswscale. However, when I run that command in a bash console it outputs -I/app/vendor/ffmpeg/include, which is what I’d expect.

  I believe that when the Go buildpack builds, it loses track of the ffmpeg package configuration information somehow. These are my config vars for the app :

  $ heroku config -s
  
  CGO_CFLAGS=-I/app/vendor/ffmpeg/include
  
  PKG_CONFIG_PATH=vendor/ffmpeg/lib/pkgconfig

  My question is : How do I get past this error ? Clearly the answer is related to the PKG_CONFIG_PATH variable, but I’m super confused on this one.

• recording yuv data which is converted from a bitmap and images are changed constantly on this bitmap

  3 février 2016, par UserAx

  I am trying to record images which are changed at a set time interval. These are displayed on an imageview. (something like a movie maker)

  For this I am :

  1. Drawing these images on a bitmap, this method is repeated over a 50ms interval

     private void BitmapUpdate() {
     
            timer = new Timer();
     
     timer.scheduleAtFixedRate(new TimerTask() {
     
         public void run() {
     
             try {
     
                 new Task1().execute();
     
             } catch (Exception e) {
     
                 // TODO: handle exception
     
             }
     
         }
     
     }, 0, 50);
     
     }
     
     
     
     class Task1 extends AsyncTask {
     
     
     
     @Override
     
     protected void onPreExecute() {
     
         super.onPreExecute();
     
         clearBitmap();
     
     
     
     }
     
     
     
     @Override
     
     protected String doInBackground(Void... arg0) {
     
     
     
         onImageDisplayed();
     
         return null;
     
     }
     
     
     
     @Override
     
     protected void onPostExecute(String result) {
     
         super.onPostExecute(result);
     
     
     
     }
     
     }
     
     
     
     public void clearBitmap(){
     
     if (imageview != null){
     
     //All the 3 methods below give same error - can't call getpixels() on recycled bitmap
     
     imageview.setDrawingCacheEnabled(false);
     
     //OR
     
     imageview.destroyDrawingCache();
     
     //OR
     
     bitmap.recycle();
     
     
     
     }
     
        }
     
     
     
     
     
     
     
      public void onImageDisplayed(){
     
     
     
     if (imageview != null) {
     
         imageview.setDrawingCacheEnabled(true);
     
         imageview.buildDrawingCache();
     
         bitmap = imageview.getDrawingCache();
     
         System.out.println(bitmap.getByteCount() + " is bitmap size ");
     
         }
     
        }

  2. Using the bitmap data to convert it to yuv data
     By using getNV21 method :

  Convert bitmap array to YUV (YCbCr NV21)

  3. Finally this yuv data is passed FFmpeg recorder, through a method similar to onPreviewFrame, except that the data is from getNV21 method. This method is started by a button click.

  What I have achieved :

  1. If i dont use clearBitmap() ; i get only the first image recorded in the video, even on changing to next image only first image is present throughout the video.

  2. So After research on stack overflow many developers suggested clearing the previous imageCache for the next Image. But in my case if i use any of these methods, anywhere,

     imageview.setDrawingCacheEnabled(false);
     
     //OR
     
     imageview.destroyDrawingCache();
     
     //OR
     
     bitmap.recycle();

  I get the error ; mostly because the getNV21 method is running non stop, and always is expecting pixels flow from the Bitmap.

  3. If i try running the methods one after another, by stopping getpixels for a moment by a boolean, i only get a black screen.

  Kindly help...!

  THANKS.