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• Couldn't open file with iFrameExtractor

  21 octobre 2012, par why

  I has built ffmpeg and iFrameExtractor with ios5.1 successful, But when I play the video, the log shows "Couldn't open file"

  // Register all formats and codecs
  
      avcodec_register_all();
  
      av_register_all();
  
  
  
      // Open video file
  
      if(avformat_open_input(&pFormatCtx, [moviePath cStringUsingEncoding:NSASCIIStringEncoding], NULL, NULL) != 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Couldn't open file\n");
  
          goto initError;
  
      }

  This is my configure file for ffmpeg 0.11.1 :

  #!/bin/tcsh -f
  
  
  
  rm -rf compiled/*
  
  
  
  ./configure \
  
  --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
  
  --as='/usr/local/bin/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk \
  
  --target-os=darwin \
  
  --arch=arm \
  
  --cpu=cortex-a8 \
  
  --extra-cflags='-arch armv7' \
  
  --extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' \
  
  --prefix=compiled/armv7 \
  
  --enable-cross-compile \
  
  --enable-nonfree \
  
  --disable-armv5te \
  
  --disable-swscale-alpha \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --enable-decoder=h264 \
  
  --enable-decoder=svq3 \
  
  --disable-asm \
  
  --disable-bzlib \
  
  --disable-gpl \
  
  --disable-shared \
  
  --enable-static \
  
  --disable-mmx \
  
  --disable-neon \
  
  --disable-decoders \
  
  --disable-muxers \
  
  --disable-demuxers \
  
  --disable-devices \
  
  --disable-parsers \
  
  --disable-encoders \
  
  --enable-protocols \
  
  --disable-filters \
  
  --disable-bsfs \
  
  --disable-postproc \
  
  --disable-debug 

• FFMpeg reading frames from avi files

  6 août 2014, par konsti

  I’m trying to read frames of movies and it is working for all formats except avi.

  When opening avi files I always get the message :

  [mpeg4 @ 0x1030e4e00] Video uses a non-standard and wasteful way to store B-frames (’packed B-frames’). Consider using a tool like VirtualDub or avidemux to fix it.
  [mpeg4 @ 0x1030e4e00] warning : first frame is no keyframe

  What do I have to do to get frames from avi files ?

  Here is my code :

  -(id)initWithVideo:(NSString *)moviePath {
  
  
  
  if (!(self=[super init])) return nil;
  
  
  
  AVCodec         *pCodec;
  
  
  
  // Register all formats and codecs
  
  avcodec_register_all();
  
  av_register_all();
  
  
  
  
  
  // Open video file
  
  
  
  pFormatCtx = avformat_alloc_context();
  
  if(avformat_open_input(&pFormatCtx, [moviePath UTF8String], NULL, NULL)!=0)
  
      goto initError; // Couldn't open file
  
  
  
  
  
  // Retrieve stream information
  
  if(avformat_find_stream_info(pFormatCtx, NULL)<0)
  
      goto initError; // Couldn't find stream information
  
  
  
  // Find the first video stream
  
  videoStream=-1;
  
  for(int i=0; inb_streams; i++)
  
      if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
  
      {
  
          videoStream=i;
  
          break;
  
      }
  
  if(videoStream==-1)
  
      goto initError; // Didn't find a video stream
  
  
  
  // Get a pointer to the codec context for the video stream
  
  pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  
  
  
  // Find the decoder for the video stream
  
  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
  if(pCodec==NULL)
  
      goto initError; // Codec not found
  
  
  
  AVDictionary *optionsDict = NULL;
  
  
  
  // Open codec
  
  if(avcodec_open2(pCodecCtx, pCodec, &optionsDict)<0)
  
      goto initError; // Could not open codec
  
  
  
  // Allocate video frame
  
  pFrame=av_frame_alloc();
  
  
  
  outputWidth = pCodecCtx->width;
  
  self.outputHeight = pCodecCtx->height;
  
  
  
  return self;

  initError :
  NSLog(@"an error occurred") ;
  return nil ;
  }

• aarch64 : hevc : Produce plain neon versions of qpel_bi_hv

  22 mars 2024, par Martin Storsjö

  aarch64 : hevc : Produce plain neon versions of qpel_bi_hv
  As the plain neon qpel_h functions process two rows at a time,
  
  we need to allocate storage for h+8 rows instead of h+7.
  By allocating storage for h+8 rows, incrementing the stack
  
  pointer won't end up at the right spot in the end. Store the
  
  intended final stack pointer value in a register x14 which we
  
  store on the stack.
  AWS Graviton 3 :
  
  put_hevc_qpel_bi_hv4_8_c : 385.7
  
  put_hevc_qpel_bi_hv4_8_neon : 131.0
  
  put_hevc_qpel_bi_hv4_8_i8mm : 92.2
  
  put_hevc_qpel_bi_hv6_8_c : 701.0
  
  put_hevc_qpel_bi_hv6_8_neon : 239.5
  
  put_hevc_qpel_bi_hv6_8_i8mm : 191.0
  
  put_hevc_qpel_bi_hv8_8_c : 1162.0
  
  put_hevc_qpel_bi_hv8_8_neon : 228.0
  
  put_hevc_qpel_bi_hv8_8_i8mm : 225.2
  
  put_hevc_qpel_bi_hv12_8_c : 2305.0
  
  put_hevc_qpel_bi_hv12_8_neon : 558.0
  
  put_hevc_qpel_bi_hv12_8_i8mm : 483.2
  
  put_hevc_qpel_bi_hv16_8_c : 3965.2
  
  put_hevc_qpel_bi_hv16_8_neon : 732.7
  
  put_hevc_qpel_bi_hv16_8_i8mm : 656.5
  
  put_hevc_qpel_bi_hv24_8_c : 8709.7
  
  put_hevc_qpel_bi_hv24_8_neon : 1555.2
  
  put_hevc_qpel_bi_hv24_8_i8mm : 1448.7
  
  put_hevc_qpel_bi_hv32_8_c : 14818.0
  
  put_hevc_qpel_bi_hv32_8_neon : 2763.7
  
  put_hevc_qpel_bi_hv32_8_i8mm : 2468.0
  
  put_hevc_qpel_bi_hv48_8_c : 32855.5
  
  put_hevc_qpel_bi_hv48_8_neon : 6107.2
  
  put_hevc_qpel_bi_hv48_8_i8mm : 5452.7
  
  put_hevc_qpel_bi_hv64_8_c : 57591.5
  
  put_hevc_qpel_bi_hv64_8_neon : 10660.2
  
  put_hevc_qpel_bi_hv64_8_i8mm : 9580.0
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/aarch64/hevcdsp_init_aarch64.c
  • [DH] libavcodec/aarch64/hevcdsp_qpel_neon.S