GarciaPL Notes - Java and Others

Recently I had to deal with an error during using Eclipse on my Ubuntu 13.10. When I clicked in Eclipse on any menu item there was nothing showed up. As far as I know this error is related with Unity graphical shell created for GNOME. One of the fix which I found is to run Eclipse with some extra additional parameters. I also created some shell script which will help to enjoy again a menu features in Eclipse.

#!/bin/bash
#
# Run Eclipse due to menu bug
#
eclipsepath="/home/user/Desktop/eclipse/eclipse"
Exec=env UBUNTU_MENUPROXY=0 $eclipsepath

In this post you can find a small piece of code which should allows you to make picture in picture using ffmpeg. More information about this effect you can find in reference section of this post.

ffmpeg -i \tmp\stream1.mp4 -r 29.97 -vf "movie=\tmp\stream2.mp4, scale=212:120 [vid2]; [in][vid2] overlay=main_w-overlay_w-10:10 [out]" \tmp\output.mp4 &

Picture in Picture using FFmpeg

A few days ago I had a problem to adding new contact using Java of course to Jitsi SIP client. So, I would like to share with you with this small piece of code :

UtilActivator.getContactListService().createMetaContact(ProtocolProviderService,
MetaContactGroup, UserID);

I would like to present you some showcase of using PHP SDK to integrate with Facebook which was developed by Naitik Shah one of the Facebook employee. Appropriate reference to this very powerful SDK you can find in reference below.

So, I have created some small showcase which aims to show how to retrieve Facebook profile (not person, but some organisation or business) and print entries which was published on it's wall. Every entry is described by Name, Image (if was uploaded), Creation time, Title and Description as on screenshot below.

FB Profile list of entries

FB Profile Manager

Let's assume that you use FFmpeg distribution in your application. One of your function is for instance saving some HLS stream (HTTP Live Streaming) into file. I suppose you are using python subprocess module to create process in Linux OS to obtain this stream to your hard disk.

In normal way if you would like to stop saving this content using FFmpeg on your storage, you will just press 'q' button while you are in terminal. Due to this FFmpeg will be able to finish saving content and do not damage the file at the end.

There is some kind of problem if you would like to kill this FFmpeg process in smooth way without damaging the file while you do not have access to the terminal.

You can use below solution written in Python to kill this FFmpeg process from your application. Only input which you need to ensure is PID (Process IDentifier) which describes your  process. You can use below shell code in Linux :

ps -ef | grep ffmpeg | awk '{print $2}'

import psutil
import os
import signal

pids = psutil.get_pid_list()

for pid in pids:
      if (pid == <your_PID>):
            os.kill(pid,signal.SIGINT)

Have you ever thought how receive the bitrate of your video/audio file using ffmpeg in command line ? Before I will show you a solution of this problem I would like to paste below some example output of video file which can be obtained using ffmpeg :

ffmpeg version git-2013-10-30-94a80e3 Copyright (c) 2000-2013 the FFmpeg developers
  built on Oct 30 2013 15:46:23 with gcc 4.8 (Ubuntu/Linaro 4.8.1-10ubuntu8)
  configuration: --prefix=/home/user/ffmpeg_build --extra-cflags=-I/home/user/ffmpeg_build/include --extra-ldflags=-L/home/luszcwoj/ffmpeg_build/lib --bindir=/home/luszcwoj/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 48.100 / 52. 48.100
  libavcodec     55. 39.100 / 55. 39.100
  libavformat    55. 19.104 / 55. 19.104
  libavdevice    55.  5.100 / 55.  5.100
  libavfilter     3. 90.100 /  3. 90.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'aquarium.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 0
    compatible_brands: isom3gp4
    creation_time   : 2013-09-08 23:38:41
  Duration: 00:00:03.44, start: 0.000000, bitrate: 3933 kb/s
    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc), 640x480 [SAR 1:1 DAR 4:3], 2250 kb/s, 29.70 fps, 29.67 tbr, 90k tbn, 30 tbc (default)
    Metadata:
      creation_time   : 2013-09-08 23:38:41
      handler_name    : VideoHandle
    Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 123 kb/s (default)
    Metadata:
      creation_time   : 2013-09-08 23:38:41
      handler_name    : SoundHandle

ffmpeg -i aquarium.mp4 2>&1 | grep bitrate: | awk '{print $6}'