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• OMXCodec die when start decoding

  24 mars 2017, par peter zhu

  I’d like to retrieve frames from video file.

  My code followed the article Use Android Hardware Decoder with OMXCodec in NDK, and also referred the code of AwesomePlayer.cpp(AOSP) and libstagefright.cpp(ffmpeg). But it still hangs whenever OMXCodec start decoding. I have no idea what the problem is.

  I’d grateful for any help.

  the code :

  int main(int argc, char *argv[])
  
  {
  
      OMXClient mClient;
  
      status_t ret = mClient.connect();
  
      LOGD("connect status is %d\n", ret);
  
  
  
      sp<datasource> mDs = DataSource::CreateFromURI("file:///sdcard/display/lwtwjod.mp4");
  
      off64_t size = 0;
  
      ret = mDs->getSize(&amp;size);
  
      LOGD("getSize[ret=%d]: %lld\n", ret, size);
  
  
  
      sp<mediaextractor> mMe = MediaExtractor::Create(mDs);
  
      size_t tracksNum = mMe->countTracks();
  
      LOGD("%u tracks\n", tracksNum);
  
  
  
      sp<mediasource> mMs;
  
  
  
      bool hasVideo = false;
  
      for(size_t i = 0; i != mMe->countTracks(); i++){
  
      sp<metadata> mMd_track = mMe->getTrackMetaData(i);
  
          const char *_mime;
  
      mMd_track->findCString(kKeyMIMEType, &amp;_mime);
  
          LOGD("the mime is %s\n", _mime);
  
          String8 mime = String8(_mime);
  
  
  
          if (!strncasecmp(mime.string(), "video/", 6)) {
  
          LOGD("find video track!\n");
  
          hasVideo = true;
  
          mMs = mMe->getTrack(i);
  
          int wid, hei;
  
          mMd_track->findInt32(kKeyWidth, &amp;wid);
  
          mMd_track->findInt32(kKeyHeight, &amp;hei);
  
          LOGD("width: %d, height: %d\n", wid, hei);
  
          break;
  
      }
  
      }
  
  
  
      if(hasVideo){
  
      sp<mediasource> decoder = 
  
          OMXCodec::Create(mClient.interface(), mMs->getFormat(),
  
                   false, mMs, 
  
                   NULL, OMXCodec::kClientNeedsFramebuffer);
  
      LOGD("start decoding..\n");
  
      ret = decoder->start(); // hangs here
  
      LOGD("decoding return: %d\n", ret);
  
  
  
      for(;;){
  
          MediaBuffer *buffer;
  
          buffer = NULL;
  
          ret = decoder->read(&amp;buffer);
  
          LOGD("read decoded buffer result: %d\n", ret);
  
          break;
  
      }
  
      }    
  
  }  
  
  </mediasource></metadata></mediasource></mediaextractor></datasource>

  The logcat output :

  I/OMXClient( 5470): Using client-side OMX mux.
  
  D/NativeCodec( 5470): connect status is 0
  
  D/NativeCodec( 5470): getSize[ret=0]: 165748860
  
  D/NativeCodec( 5470): 2 tracks
  
  D/NativeCodec( 5470): the mime is video/avc
  
  D/NativeCodec( 5470): find video track!
  
  D/OMXCodec( 5470): Successfully allocated OMX node 'OMX.qcom.video.decoder.avc'
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] AVC profile = 100 (High), level = 31
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] video dimensions are 1280 x 720
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] Crop rect is 1280 x 720 @ (0, 0)
  
  D/NativeCodec( 5470): start decoding..
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocating 2 buffers of size 2097152 on input port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8e39390 on input port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8e393e0 on input port
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  No color conversion required
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocating 15 buffers of size 1433600 on output port
  
  E/OMX-VDEC-1080P(  197): GET_MV_BUFFER_SIZE returned: Size: 245760 and alignment: 8192
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9b08 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9b58 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9ba8 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9bf8 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9c48 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9c98 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9ce8 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9d38 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9d88 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9dd8 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9e28 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9e78 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9ec8 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9f18 on output port
  
  I/OMXCodec( 5470): [OMX.qcom.video.decoder.avc] allocated buffer 0xb8eb9f68 on output port
  
  E/OMXNodeInstance(  197): !!! Observer died. Quickly, do something, ... anything...
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9f68 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9f18 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9ec8 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9e78 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9e28 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9dd8 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9d88 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9d38 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9ce8 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9c98 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9c48 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9bf8 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9ba8 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9b58 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8eb9b08 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8e393e0 successful
  
  I/OMXNodeInstance(  197): OMX_FreeBuffer for buffer header 0xb8e39390 successful
  
  E/OMX-VDEC-1080P(  197): 
  
  E/OMX-VDEC-1080P(  197):  Error in ioctl read next msg
  
  E/        (  197): 
  
  E/        (  197):  Destroy C2D instance
  
  E/        (  197): 
  
  E/        (  197):  Destroy C2D instance

• ffmpeg : generate different multibitrate video from single input

  26 septembre 2016, par Stack Overflow

  I want to generate multiple multibitrate files from one single resource.

  I want to generate 4 different quality file : 240p , 360p , 720p , 1080p.

  My requirement is suppose i provide a file having 360p quality then only 2 file get generated
  1) 240p
  2) 360p

  If, I provide a file having 720p quality then 3 files get generated
  1) 240p
  2) 360p
  3) 720p

  Exactly same like youtube. (If you upload higher quality video then it provides more quality option , if you upload lower quality video then it provide less quality option).

  Is there any ffmpeg command which do same ? i.e from single input source it identify and generate multibitrate file of lower bitrate automatically.

• Revision 8f9d94ec17 : SSSE3 Optimization for Atom processors using new instruction selection and order

  5 décembre 2014, par levytamar82

  Changed Paths :
   Modify /vp9/common/x86/vp9_subpixel_8t_ssse3.asm

  
  
  SSSE3 Optimization for Atom processors using new instruction selection and
  ordering

  The function vp9_filter_block1d16_h8_ssse3 uses the PSHUFB instruction which has
  a 3 cycle latency and slows execution when done in blocks of 5 or more on Atom
  processors.
  By replacing the PSHUFB instructions with other more efficient single cycle
  instructions (PUNPCKLBW + PUNPCHBW + PALIGNR) performance can be improved.
  In the original code, the PSHUBF uses every byte and is consecutively copied.
  This is done more efficiently by PUNPCKLBW and PUNPCHBW, using PALIGNR to
  concatenate the intermediate result and then shift right the next consecutive 16
  bytes for the final result.

  For example :
  filter = 0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8
  Reg = 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
  REG1 = PUNPCKLBW Reg, Reg = 0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7
  REG2 = PUNPCHBW Reg, Reg = 8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15
  PALIGNR REG2, REG1, 1 = 0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8

  This optimization improved the function performance by 23% and produced a 3%
  user level gain on 1080p content on Atom processors.
  There was no observed performance impact on Core processors (expected).

  Change-Id : I3cec701158993d95ed23ff04516942b5a4a461c0