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• Android video color ajustments

  4 octobre 2012, par Christian

  I'm working on an Android app that among other things will allow the users to make short videos, apply funny effects to them and share them with one another. To begin with, i'm looking for simple color-effects like grayscale, brightness, contrast, sepiatoning, and such.

  All this would be very simple by using the camera-class which can apply the color effects at recording-time - at least most phone's cameras can - i've tested some using Camera.getParameters().getSupportedColorEffects();. But the thing is: i need to do it after the recording has been done: the user would open a video, and choose among a set of effects to apply; then upload that changed video to a shared server.

  I can't for the love of * find a good way to do this.

  Android doesn't seem to include any videoutilities in the sdk. The android.media.effect package can do some effects, but only backdropper for videos, the rest are for images. Extracting bitmaps from the surfaceview of a videoview during playback doesn't work, it just returns an all-black bitmap. It seems like there's no way to intercept the datastream between the storage and the screen. and apply the effects there. I've started to look into using the FFmpeg library to decode a video file so i can get access to the data, but that requires quite a bit of native coding, and also requires separate compiles for various CPU architectures, so it's very messy. I thought that as the camera can apply these effects (on a Sony LT26i: none, mono, negative, solarize, sepia, posterize), perhaps one could feed the recorder with a videostream not from the camera, but from the memory, and by that way use a stored video file?

  Do anyone know if there is a good way to apply effects to a video - after it has been recorded?

• Crash in audio resampler with some audio rates - FFMPEG PHP [migrated]

  4 octobre 2012, par Olaf Erlandsen

  i have a problem with this command( FFMPEG PHP ):

  Command:

  ffmpeg -i 62f76f050494f0ed6a5997967c00c0c0.wmv -ss 0 -t 99 -y -ar 44100 -async 44100 -r 29.970 -ac 2 -qscale 5 -f flv 62f76f050494f0ed6a5997967c00c0c0.flv
  

  Output:

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
    libavutil     50.15. 1 / 50.15. 1
    libavcodec    52.72. 2 / 52.72. 2
    libavformat   52.64. 2 / 52.64. 2
    libavdevice   52. 2. 0 / 52. 2. 0
    libavfilter    1.19. 0 /  1.19. 0
    libswscale     0.11. 0 /  0.11. 0
    libpostproc   51. 2. 0 / 51. 2. 0
  [asf @ 0xe81670]max_analyze_duration reached
  Input #0, asf, from '/var/www/resources/tmp/62f76f050494f0ed6a5997967c00c0c0.wmv':
    Metadata:
      WMFSDKVersion   : 12.0.7601.17514
      WMFSDKNeeded    : 0.0.0.0000
      IsVBR           : 0
    Duration: 00:00:50.87, bitrate: 2467 kb/s
      Stream #0.0: Audio: wmapro, 44100 Hz, stereo, flt, 256 kb/s
      Stream #0.1: Video: vc1, yuv420p, 950x460 [PAR 1:1 DAR 95:46], 25 fps, 25 tbr, 1k tbn, 25 tbc
  Output #0, flv, to '/var/www/resources/media/62f76f050494f0ed6a5997967c00c0c0.flv':
    Metadata:
      encoder         : Lavf52.64.2
      Stream #0.0: Video: flv, yuv420p, 950x460 [PAR 1:1 DAR 95:46], q=2-31, 200 kb/s, 1k tbn, 29.97 tbc
      Stream #0.1: Audio: libmp3lame, 11025 Hz, stereo, s16, 64 kb/s
  Stream mapping:
    Stream #0.1 -> #0.0
    Stream #0.0 -> #0.1
  Press [q] to stop encoding
  frame=   72 fps=  0 q=5.0 size=       0kB time=10.91 bitrate=   0.0kbits/s    
  Multiple frames in a packet from stream 0
  Warning, using s16 intermediate sample format for resampling
  frame=  141 fps=139 q=5.0 size=     103kB time=8.15 bitrate= 103.2kbits/s    
  frame=  220 fps=144 q=5.0 size=     875kB time=10.92 bitrate= 656.6kbits/s    
  frame=  290 fps=143 q=5.0 size=    1525kB time=13.74 bitrate= 909.1kbits/s    
  frame=  356 fps=141 q=5.0 size=    2153kB time=15.99 bitrate=1103.1kbits/s    
  frame=  427 fps=141 q=5.0 size=    2847kB time=18.70 bitrate=1247.0kbits/s    
  frame=  497 fps=141 q=5.0 size=    3771kB time=21.16 bitrate=1460.0kbits/s    
  frame=  575 fps=142 q=5.0 size=    4695kB time=24.61 bitrate=1563.0kbits/s    
  frame=  639 fps=141 q=5.0 size=    5301kB time=26.80 bitrate=1620.2kbits/s    
  frame=  703 fps=139 q=5.0 size=    5829kB time=29.36 bitrate=1626.2kbits/s    
  frame=  774 fps=139 q=5.0 size=    6659kB time=32.39 bitrate=1684.0kbits/s    
  frame=  842 fps=139 q=5.0 size=    7915kB time=35.27 bitrate=1838.6kbits/s    
  frame=  911 fps=139 q=5.0 size=    9011kB time=37.98 bitrate=1943.4kbits/s    
  frame=  975 fps=138 q=5.0 size=    9788kB time=40.59 bitrate=1975.3kbits/s    
  frame= 1041 fps=138 q=5.0 size=   10904kB time=43.83 bitrate=2037.9kbits/s    
  frame= 1115 fps=138 q=5.0 size=   11795kB time=46.24 bitrate=2089.8kbits/s    
  frame= 1183 fps=138 q=5.0 size=   12678kB time=48.74 bitrate=2130.7kbits/s    
  frame= 1247 fps=137 q=5.0 size=   13964kB time=51.36 bitrate=2227.5kbits/s    
  frame= 1271 fps=136 q=5.0 Lsize=   15865kB time=58.86 bitrate=2208.1kbits/s
  video:15366kB audio:462kB global headers:0kB muxing overhead 0.238956%
  

  Problem:

  Warning, using s16 intermediate sample format for resampling
  

  I've also tried changing the parameter

  From

  -ar 44100
  

  to

  -ar 11025
  

  Thanks!

• MobileVLC for Iphonesimulator

  4 octobre 2012, par lvreiny

  I'm trying to build mobilevlc for iphonesimulator. I follow the steps from vlc's wiki:

  $ git clone git://git.videolan.org/MobileVLC.git 
  $ cd MobileVLC 
  $ ./buildMobileVLC.sh
  

  It stucked at ffmpeg's configure, no response in terminal. Anyone has the same experience? What could be the problem?

  I'm using Mac OSX Lion 10.7.5, Xcode 4.5, and building MobileVLC for Iphonesimulator5.1

• Install ffmpeg in linux server [migrated]

  3 octobre 2012, par Rahul TS

  Please help me to guide me in how to install ffmpeg and ffmpeg-php extension in linux based server. I surfed a lot in the net. I got lots of answers, all of that says to give some command line script in the linux command promt. I am using the cpanel server and is confused how to do this, also I cant find where to gave these commands. Or is there another way to install it.

  Please help me to solve this issue

• ffmpeg target file size 0

  3 octobre 2012, par user1165201

  I would like to ask a question about "ffmpeg"

  I use the following command to chunk a video around 12 minutes. But after over 80 chunks, the target file size is 0.

  "ffmpeg -i " + wav_path + " -ss " + ff_hhmmss_video(t1) + " -t " + ff_hhmmss_video(t2-t1) + " -acodec copy -async 1 -y " + temp_filename
  

  I would like to get some suggestions about this. Thanks.