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• accelerate x264 encoding

  7 août 2012, par Saraswati

  i am making use of x264 to encode raw data captured from the iphone camera .. but the encoding is very slow .Can anyone help me accelerate the encoding speed.

  I have used following settings to build x264 lib :

  //for armv6

  CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure —host=arm-apple-darwin —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk —prefix='dist' —extra-cflags='-arch armv6' —extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system/ —extra-ldflags='-arch armv6' —enable-pic —disable-asm

  //for armv7

  CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure —host=arm-apple-darwin —sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk —prefix='dist' —extra-cflags='-arch armv7' —extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system/ —extra-ldflags='-arch armv7' —enable-pic

  I am using default preset like this :

  x264_param_default_preset(param, "slow", "zerolatency");

  and setting few perameters :

  param->i_bframe = 0;
  
  param->analyse.i_me_method = X264_ME_HEX;
  
  param->analyse.i_subpel_refine = 2;
  
  param->i_frame_reference = 1;
  
  param->analyse.b_mixed_references = 0;
  
  param->analyse.i_trellis = 0;
  
  param->rc.b_mb_tree = 0;
  
  param->analyse.i_weighted_pred = X264_WEIGHTP_NONE;
  
  
  
  
  
  param->rc.i_bitrate = 180;
  
  param->rc.i_qp_min = 20; 
  
  param->rc.i_qp_max = 26; 
  
  
  
  param->i_keyint_max = 15; 
  
  param->i_keyint_min = 15;
  
  
  
  
  
  param->i_width = w;
  
  param->i_height = h;
  
  
  
  x264_param_apply_profile(param, "baseline");
  
  x264_picture_alloc( &(enc->pic), X264_CSP_I420, param->i_width, param->i_height );

• iFrameExtractor fails to build library for armv7 using XCode 4.3.3 & iOS 5.1

  16 mars 2013, par Rajat Lala

  I have downloaded code to build with XCode 4.3.3 for iOS 5.1 from this link - https://github.com/lajos/iFrameExtractor
  I am successfully able to build the libraries for FFmpeg using build_universal script. But it always builds the libraries for X86_64 architecture. Checked with lipo -info command.

  Also tried the build script from the link - http://stexgroup.com/blog/ffmpeg-for-iphone-ios-xcode4.3-build-script. It also builds libraries for X86_64 architecture.

  I changed the scripts as per this post - problem compiling ffmpeg for iFrameExtractor

  But nothing is working for me.

  The build script for armv7 [iFrameExtractor] is as following

  ./configure \
  
  --disable-bzlib --disable-doc \
  
  --disable-ffmpeg --disable-ffplay \
  
  --disable-ffserver --disable-mmx \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
  
  --as='gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
  
  --enable-cross-compile --target-os=darwin \
  
  --arch=arm --cpu=cortex-a8 --enable-pic \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk \
  
  --extra-ldflags="-arch armv7 -    L//Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk/usr/lib" \
  
  --extra-cflags="-arch armv7"

  Can anybody guide me what can be the issue, considering the same thing is working for everyone else ?

• Using ffmpeg to convert flv to mp4 on debian 6 [closed]

  28 mars 2013, par user1542610

  I am using ffmpeg on debian version squeeze/sid to convert flv to mp4.I need to view final output on iphone, ipad. I have tried many different combinations but have not succeeded in converting the file properly.

  Information about the sample flv file is as follows - via command ffmpeg -i sample.flv

    FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Jun 12 2012 16:27:59, gcc: 4.4.3
  
  Input #0, flv, from 'sample.flv':
  
    Duration: 00:01:06.90, start: 2.079000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 352x200, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16
  
  At least one output file must be specified

  when i try using command - ffmpeg -i sample.flv -sameq -ar 22050 sample.mp4

  I get error with following output.

  ffmpeg -i sample.flv -sameq -ar 22050 sample.mp4
  
  FFmpeg version SVN-r0.5.9-4:0.5.9-0ubuntu0.10.04.1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --extra-version=4:0.5.9-0ubuntu0.10.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-runtime-cpudetect --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 1 / 52.20. 1
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Jun 12 2012 16:27:59, gcc: 4.4.3
  
  Input #0, flv, from 'sample.flv':
  
    Duration: 00:01:06.90, start: 2.079000, bitrate: N/A
  
      Stream #0.0: Video: flv, yuv420p, 352x200, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0.1: Audio: nellymoser, 44100 Hz, mono, s16
  
  Output #0, mp4, to 'sample.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 352x200, q=2-31, 200 kb/s, 90k tbn, 1k tbc
  
      Stream #0.1: Audio: 0x0000, 22050 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1
  
  Unsupported codec for output stream #0.1

  I am not very conversant with ffmpeg and any help, pointers would highly appreciated.

  Many thanks is advance.