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• Android Recorded Video Compression

  28 juillet 2014, par Nick Babenko

  This is a fairly long-winded issue and I’ve tried a couple of methods to fix it.

  The ultimate problem is the user records a video and the video is to be uploaded via a REST API. The original solution was to use the camera app and pass the user though via an Intent. This method requires very little configuration for video optimisation - using the MediaStore.EXTRA_VIDEO_QUALITY and value of 0 gives MMS optimisation, which makes the videos pretty much unusable and I was hoping for something a little more around 480p.

  So I started to create a custom video recorder using the MediaRecorder class. I managed to get this to work fine on a Nexus 4. I have 2 other test devices, a ZTE Blade and an Acer Iconica tab and it didn’t work with either of these devices.
  The ZTE Blade complained about an incorrect video size but the video size I was using was given by Camera.Parameters.getSupportedVideoSizes.
  The Acer Iconica tab didn’t have any valid CamcorderProfile’s. Calling CamcorderProfile.hasProfile on all of the available CamcorderProfile constants returned false. So if I was unsuccessful at loading a CamcorderProfile I attempted to configure MediaRecorder manually based on a device profile I found. This worked to an extent, but when I pressed record, I was presented with a black screen.

  The second solution was to use the existing camera intent solution, but then compress the video using FFMPEG. My experience of using the Android NDK is nil, so it was a bit of a challenge. I managed to compile a library which interfaces natively with FFMEG - this one specifically (https://github.com/Batterii/android-ffmpeg-x264). The Videokit class initialises, but when it comes to calling run with the following arguments :

  videoKit.run(new String[] {"ffmpeg", "-i", file.getAbsolutePath(), "-vf",
                       "scale=-1:480", "-vcodec", "mp3g4", "-qscale", "3",
                       outputFile.getAbsolutePath()});

  The app suddenly stops with no exception and almost nothing in the logs except that the activity suddenly stopped.

  The ultimate question I’ve been getting to is wether anyone has any solution to compress a video recorded on an Android device. If anyone can add to any of the issues I mentioned which hopefully will fix the issue, but I can’t quite get working then I will appreciate that even more.

  Thanks for reading and any help anyone has is incredibly appreciated.

• Fast Video Compression on Android

  7 avril 2017, par Asif Aminur Rashid

  I want to upload video files to server and compress before uploading. I’m using ffmpeg libx264. I have seen viber can upload 30 second video file of size 78MB within a minute [reduce it’s down to 2.3MB]. I want to know how do they do it so fast ?

  What I have tried so far -

  FFMPEG version :  n2.4.2 
  
  Built with gcc 4.8
  
  
  
  Build Configuraiton : --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-neon --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 -mfpu=neon' --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=

  Command :

  ffmpeg -y -i /storage/emulated/0/main.mp4 -s 480x320 -r 20 -c:v libx264 -preset ultrafast -c:a copy -me_method zero -tune fastdecode -tune zerolatency -strict -2 -b:v 1000k -pix_fmt yuv420p /storage/emulated/0/output.mp4

  The result so far is, a 30second 78MB file gets compressed to 4.3MB which takes around 1min 28seconds. Here is the console dump - http://pastebin.com/rn81acGx . I mainly want to reduce the time it takes to compress. How can I achieve this ?

  Thanks in advance.

• Fast Video Compression on Android

  7 avril 2017, par leap of faith

  I want to upload video files to server and compress before uploading. I’m using ffmpeg libx264. I have seen viber can upload 30 second video file of size 78MB within a minute [reduce it’s down to 2.3MB]. I want to know how do they do it so fast ?

  What I have tried so far -

  FFMPEG version :  n2.4.2 
  
  Built with gcc 4.8
  
  
  
  Build Configuraiton : --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-neon --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 -mfpu=neon' --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=

  Command :

  ffmpeg -y -i /storage/emulated/0/main.mp4 -s 480x320 -r 20 -c:v libx264 -preset ultrafast -c:a copy -me_method zero -tune fastdecode -tune zerolatency -strict -2 -b:v 1000k -pix_fmt yuv420p /storage/emulated/0/output.mp4

  The result so far is, a 30second 78MB file gets compressed to 4.3MB which takes around 1min 28seconds. Here is the console dump - http://pastebin.com/rn81acGx . I mainly want to reduce the time it takes to compress. How can I achieve this ?

  Thanks in advance.