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Sur d’autres sites (6697)

  • 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

  • Trim / Cut video on Android using FFMpeg's Copy

    6 août 2012, par Kevin P

    We're trying to replicate the functionality of this command line ffmpeg directive using the FFMpeg c api through JNI calls on Android.

    ffmpeg -ss 2 -t 120 -vcodec copy -acodec copy -i input.file output.file

    Basically, given a start and end time, we wish to copy (not re-encode) a small(er) segment of video from the larger (input) video source.

    We've been using the wonderful JavaCv wrapper to openCv and FFMpeg, but we just cannot figure out how to do this simple bit of work. We've been scouring the ffmpeg.c and related sources and while I now understand that it switches to stream_copy and remuxing rather than re-encoding when the codec is specified as copy I cannot for the life of me identify what series of method calls to make to replicate this through the C api. Does anyone have an example JNI file for doing this ? Or are there rockstar C types that can explain how I get from that command line to api calls ? We've spent the better part of two weeks working on this (we're not native C guys) and we're at the point where we just need to ship some code. Any example code, especially JNI code or method call maps etc. would be greatly appreciated !

  • iPhone video PHP upload. Windows to HTML5 tag

    21 août 2012, par zeshin

    As those of you with an iPhone know, the iCloud uploads all pictures and videos taken on the iPhone to the cloud and, thereafter, your home PC.

    I am uploading videos to my web page through a PHP function, which are then displayed as embedded HTML5 videos with the tag. The problem I am running into is that videos taken on the iPhone in portrait are showing up on both my PC and website in landscape view.

    Due to the fact that uploads come from multiple sources, I need a sever-side solution to recognize the orientation of the video and rotate it as needed.

    Does anyone know of a way to accomplish this without using additional plugins such as ffmpeg ?

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