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• FFDEC_H264 dropping non-key frames

  15 avril 2013, par Kranti

  I am working on a sample GStreamer application to play MPEG2TS Video.

  My pipeline is :

  appsrc ! h264parse ! ffdec_h264 ! ffmpegcolorspace ! ximagesink

  If I pump the data without setting any timestamp, all the frames are getting played

  videoBuffer = gst_app_buffer_new (rawVideo, bufSize, test_free_video, rawVideo);

  But if I set the timestamp to the buffer, only I-frames are getting played :

  videoBuffer = gst_app_buffer_new (rawVideo, bufSize, test_free_video, rawVideo);
  
  GST_BUFFER_TIMESTAMP(videoBuffer)  = calc_timestamp(rawVideo);

  calc_timestamp() is a function to calculate timestamp based on PES header info

  From the GST_LOGS :

  Dropping non-keyframe (seek/init)
  
  Dropping non-keyframe (seek/init)
  
  Dropping non-keyframe (seek/init)

  The above logs are getting repeated. I don't have any clue, why is this happening ? Any input would be appreciated.

  Thanks in advance,
  Kranti

• Building FFMPEG library for iOS5.1 ARMv7

  25 octobre 2012, par Jimmy

  I'm trying to use the FFMPEG library in an XCode 4.5.1 project. And I'm trying to build it for ARMv7

  But I'm running into some major issues, I'm hoping that someone can walk me through how to do it ? I feel a little sketched out reading material thats a couple months old. I'm not aware of the changes.

  New Update (after a lot of time)

  I want to help everyone out that is having this problem because its so frustrating. heres how you do it. I've pasted the configuration stage. This is my ./configure

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-cross-compile --arch=arm --target-os=darwin
  
     --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  
     --as='gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2'
  
     --sysroot=/applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  
     --cpu=cortex-a8
  
     --extra-ldflags='-isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk'
  
     --enable-pic
  
     --disable-bzlib --disable-gpl --disable-shared --enable-static --disable-mmx --disable-debug --disable-neon
  
     --extra-cflags='-pipe -Os -gdwarf-2 -isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} -mthumb-interwork'

  This ended up working for me. I had the following problems.

  • I had to download ( https://github.com/yuvi/gas-preprocessor ) copy the file gas-preprocessor.pl at /usr/local/bin. Set permissions to read write (777)
  • Make sure I'm using the right GCC compiler : /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  • Make sure I'm using the right SDK : /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  • —extra-cflags="-arch armv7" causes bugs in the configure. take it out. This was causing my gcc compile errors. (specifically this one : error : unrecognized command line option “-arch”.)

  I'll let you guys know how much further I get.

• Revision 672ba3ddf5 : Unifying tile decoding for both direct and inverse tile order. Now tile decodin

  7 novembre 2013, par Dmitry Kovalev

  Changed Paths :
   Modify /vp9/decoder/vp9_decodframe.c

  
  
  Unifying tile decoding for both direct and inverse tile order.

  Now tile decoding consists of two stages :
  1. Find tile buffer start and its size, put this info into tile_buffers.
  2. Decode each tile based on information from tile_buffers.

  It seems that stage 1 can also be reused by multithreaded tile decoder.

  Change-Id : If0cdaefdd6d10bb41c63561346c9ae4cfac081dd