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• Combine 2 mp3 files by using FFmpeg

  6 janvier 2016, par sajadmartiny

  I need to combine two mp3 files by using ffMpeg.
  I use this code, but it doesn’t work

  I want to execute this

  ffmpeg -i input1.mp3 -i input2.mp3 -filter_complex amerge -c:a libmp3lame -q:a 4 output.mp3

  Why isn’t my code working ?

  and my complete output log , problem Unknown encoder ’libmp3lame’

          01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout ffmpeg version n2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   built on Oct  7 2014 15:05:17 with gcc 4.8 (GCC)
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   configuration: --target-os=linux --cross-prefix=/home/sb/Source-Code/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/sb/Source-Code/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/sb/Source-Code/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/sb/Source-Code/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/sb/Source-Code/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/sb/Source-Code/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavutil      54.  7.100 / 54.  7.100
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavcodec     56.  1.100 / 56.  1.100
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavformat    56.  4.101 / 56.  4.101
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavdevice    56.  0.100 / 56.  0.100
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libavfilter     5.  1.100 /  5.  1.100
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libswscale      3.  0.100 /  3.  0.100
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libswresample   1.  1.100 /  1.  1.100
  
  01-06 11:48:13.560 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   libpostproc    53.  0.100 / 53.  0.100
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout Input #0, mp3, from '/storage/emulated/0/a.mp3':
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Metadata:
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     title           : Creep
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     album           : Pablo Honey
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     track           : 2/13
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     disc            : 1/1
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     artist          : Radiohead
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     genre           : Alternative
  
  -06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     publisher       : EMI Music Distribution
  
  -06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     album_artist    : Radiohead
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     composer        : Colin Greenwood/Ed O'Brien/Jonny Greenwood/Phil Selway/Thom Yorke
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     date            : 1993
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Duration: 00:03:55.91, start: 0.025057, bitrate: 320 kb/s
  
  01-06 11:48:13.572 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 320 kb/s
  
  01-06 11:48:13.573 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     Metadata:
  
  01-06 11:48:13.573 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout       encoder         : LAME3.97 
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout [mp3 @ 0x2b403a90] Estimating duration from bitrate, this may be inaccurate
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout Input #1, mp3, from '/storage/emulated/0/b.mp3':
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Metadata:
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     title           : This is Love                  
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     artist          : Chirs de Burgh                
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     album           : This Way Up                   
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     date            : 1994
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     comment         :                               
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout   Duration: 00:03:47.67, start: 0.000000, bitrate: 128 kb/s
  
  01-06 11:48:13.577 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout     Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
  01-06 11:48:13.579 6119-6472/com.uraroji.garage.android.mp3recvoice D/test: shellout Unknown encoder 'libmp3lame'
  
  01-06 11:48:13.580 6119-6473/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=14: exiting
  
  01-06 11:48:13.580 6119-6473/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=14: bye!
  
  01-06 11:48:13.580 6119-6119/com.uraroji.garage.android.mp3recvoice D/test: processComplete 1
  
  01-06 11:48:13.580 6119-6472/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=13: exiting
  
  01-06 11:48:13.581 6119-6472/com.uraroji.garage.android.mp3recvoice D/dalvikvm: threadid=13: bye!

• We are hiring engineers to build an awesome product and platform used by millions of people

  16 février 2016, par Piwik Core Team — Uncategorized

  Are you ready for a new challenge ? Or maybe you know someone who is looking for a change ? We have some exciting problems to solve and are looking for senior developers to work with us and our community on our open source Piwik Analytics platform. Piwik is used by more than one million websites all over the world. It is deployed on more than 300.000 servers and some users track more than 1 billion actions per month.

  What is it like to work on Piwik ?

  We develop this software using modern PHP, MySQL, Redis, AngularJS and more. We provide several kind of APIs and a plugin architecture to allow developers to extend and change Piwik to their needs. However, we would not be Piwik if we stopped at this point ! We want to turn Piwik into an even more awesome product and platform.
  You can imagine there is a lot to do and many challenges to face !

  While one part is to always make Piwik scale better and to improve UI and UX, we also want to provide simple APIs to make the life of developers as pleasant as possible. We aim to solve things the right way and our thousands of unit, integration, system, JavaScript and screenshot tests help us to innovate and to not be afraid of change. We like clean code and constant improvements.

  The Piwik team lives in New Zealand and Europe (Germany). We do the vast majority of our collaboration online. Our values include being open, transparent and sharing knowledge. For this we use tools like GitHub and Slack to communicate and Quake servers to take our minds off complex challenges. We are a small, flexible team, so when you come aboard, you will play an integral part in engineering and have a big impact on the product loved by so many people. You’ll help to create a welcoming environment for new contributors and set an example with your development practices and communications skills.

  Apply now, or spread the word !

  If you have strong skills in PHP send us an email with your CV and tell us a little about yourself and your experience in engineering complex applications.

  Apply for a job here http://piwik.org/jobs/ and if you’re maybe not the right candidate, contribute to the project by sharing this blog post and by sending it to your friends !

• ffmpeg : Dynamically set output duration based on sliding text width

  18 janvier 2016, par John Whiteman

  I need to create a smooth ’news ticker’ on a low powered android device. Unfortunately this is impossible at runtime using HTML or native code as there is always some stutter or glitch.

  I’ve created a solution that gives me a smooth result by encoding an mp4 for each message and displaying one video after the other. This is the code I’m using :

  ffmpeg -f lavfi -i color=c=black:s=1280x100 -vf "drawtext=BebasNeue.otf:fontsize=60:fontcolor=white:y=h-line_h-30:x=-(4*n)+1280:text='Hello world'" -t 10 output.mp4

  Problem :
  I need to set the video’s duration dynamically so that the video stops when the text has completed it’s journey from right to left. The messages will be of varying lengths and I need each message to scroll at a constant speed (ie. an mp4 with a longer message would have a longer duration).

  Is this possible via an expression ? If not is there some clever way I can calculate this outside of ffmpeg and pass it to the ’-t’ (duration) parameter ?

  ** Edit **
  To calculate outside of ffmpeg I can do a calculation like video_width + text_width / video_fps (ie. 1280 + 262 / 25) to give me the duration. So now I’m just looking to see if this is possible within the ffmpeg command line itself. t

  Many thanks