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• How do i use libavfilter to deinterlace frames in my video player software

  19 juin 2014, par justanothercoder

  I’m using libavformat/libavcodec/libswscale/libavutil/libavfilter (ffmpeg related libraries) to make a video player.

  I’v gotten into issues with interlaced videos, it just pairs them incorrectly... It always draws the previous bottom frame with the current top frame. Which results in things I don’t want. And i’v tried messing about with the variables around this, it just won’t work. (I haven’t found a player which would play the videos I have correctly, no you can’t have them, i’m sorry)

  I managed to find a way around this, by re-encoding the video with the following command :

  ffmpeg -i video.mp4 -filter:v yadif -vcodec mpeg4 out.avi

  Now what i’d need is directions on how to do this with c++ code, inside my video player.

  I haven’t found any tutorials on the matter and the ffmpeg.c source code is just too alien to me.

  A link to a tutorial would be fine, i just haven’t found it..

  Edit :

  Also this example was worth checking out :

  https://github.com/krieger-od/imgs2video/blob/master/imgs2video.c

  It’s by a gentleman named Andrey Utkin

• FFMpeg Android Stagefright SIGSEGV error (h264 decode)

  19 avril 2013, par Sergey Ochkur

  I need to decode h264 file to YUV on Android 2.3+. As I understand I need to communicate with Stagefright, as it`s the only way now, after closing access with OpenMAX IL implementations. I have used FFmpeg 0.10 (and tried 0.9/0.9.1..) for this issue, compiled it with NDK7 (and also tried NDK6b with the same result) :

    ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jan 28 2012 14:42:37 with gcc 4.4.3
  
    configuration: --target-os=linux --cross-prefix=arm-linux-androideabi- --arch=arm --cpu=armv7-a --sysroot=/home/grid/Android/Android_NDK/platforms/android-9/arch-arm --disable-avdevice --disable-decoder=h264 --disable-decoder=h264_vdpau --enable-libstagefright-h264 --prefix=build/stagefright/armeabi-v7a --extra-cflags='-Iandroid-source/frameworks/base/include -Iandroid-source/system/core/include -Iandroid-source/frameworks/base/media/libstagefright -Iandroid-source/frameworks/base/include/media/stagefright/openmax -I/home/grid/Android/Android_NDK/sources/cxx-stl/system/include -march=armv7-a -mfloat-abi=softfp -mfpu=neon' --extra-ldflags='-Wl,--fix-cortex-a8 -Landroid-libs -Wl,-rpath-link,android-libs' --extra-cxxflags='-Wno-multichar -fno-exceptions -fno-rtti'
  
    libavutil      51. 34.101 / 51. 34.101
  
    libavcodec     53. 60.100 / 53. 60.100
  
    libavformat    53. 31.100 / 53. 31.100
  
    libavfilter     2. 60.100 /  2. 60.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  6.100 /  0.  6.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  Hardware : Beagleboard-Xm + TI Android 2.3 (official)

  So, entering next command give me error with 480p :
  ffmpeg -i /sdcard/Video/480p.mp4

  Stopped (signal) ffmpeg -i /sdcard/Video/480p.mp4

  Full Android "answer" from ADB Logcat :
  http://pastebin.com/76JLgtXX

  Android-developers, does anybody know what this error means and how to deal with it ?
  I tried to make DSP window bigger, but with no luck.
  Commands like "stagefright /sdcard/Video/480p.mp4" works fine.

  P.S. Additionally I found that on some bigger files (720p) Android answers next :

  [libstagefright_h264 @ 0xd479b0] Decode failed : 80000000

• Compiling ffmpeg with mingw + libx264

  31 janvier 2012, par Pat

  I'm installed most necessary components to build ffmpeg and x264. Here's the process :

  Launched msys, went ahead and moved the x264 source folder, ran the following configure with make and make install after :

  ./configure --enable-static --enable-shared --enable-win32thread

  Worked like a charm, had my .dll's, the .a link file.

  Moved over to ffmpeg's folder, downloaded the source from zeranoe's build website, ran the following procedure :

  export CPPFLAGS="$CPPFLAGS -IC:/MinGW/msys/1.0/local/include"
  
  export LDFLAGS="$LDFLAGS -LC:/MinGW/msys/1.0/local/lib" 
  
  ./configure --enable-shared --enable-decoder=h264 --enable-w32threads --enable-gpl --enable-libx264 --extra-libs=C:/MinGW/msys/1.0/local/lib/libx264.a --extra-cflags=-IC:/MinGW/msys/1.0/local

  I do the make, and it fails after 5 minutes :
  http://pastie.org/3290141