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• x86 : replace explicit REP_RETs with RETs

  1er février 2023, par Lynne

  x86 : replace explicit REP_RETs with RETs
  From x86inc :
  
  > On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either
  
  > a branch or a branch target. So switch to a 2-byte form of ret in that case.
  
  > We can automatically detect "follows a branch", but not a branch target.
  
  > (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.)
  x86inc can automatically determine whether to use REP_RET rather than
  
  REP in most of these cases, so impact is minimal. Additionally, a few
  
  REP_RETs were used unnecessary, despite the return being nowhere near a
  
  branch.
  The only CPUs affected were AMD K10s, made between 2007 and 2011, 16
  
  years ago and 12 years ago, respectively.
  In the future, everyone involved with x86inc should consider dropping
  
  REP_RETs altogether.
  

  • [DH] libavcodec/x86/aacpsdsp.asm
  • [DH] libavcodec/x86/ac3dsp.asm
  • [DH] libavcodec/x86/alacdsp.asm
  • [DH] libavcodec/x86/audiodsp.asm
  • [DH] libavcodec/x86/dirac_dwt.asm
  • [DH] libavcodec/x86/fft.asm
  • [DH] libavcodec/x86/flacdsp.asm
  • [DH] libavcodec/x86/h264_chromamc.asm
  • [DH] libavcodec/x86/h264_chromamc_10bit.asm
  • [DH] libavcodec/x86/h264_deblock_10bit.asm
  • [DH] libavcodec/x86/h264_idct.asm
  • [DH] libavcodec/x86/h264_idct_10bit.asm
  • [DH] libavcodec/x86/h264_intrapred.asm
  • [DH] libavcodec/x86/h264_intrapred_10bit.asm
  • [DH] libavcodec/x86/h264_qpel_10bit.asm
  • [DH] libavcodec/x86/h264_qpel_8bit.asm
  • [DH] libavcodec/x86/h264_weight.asm
  • [DH] libavcodec/x86/h264_weight_10bit.asm
  • [DH] libavcodec/x86/hevc_sao.asm
  • [DH] libavcodec/x86/hevc_sao_10bit.asm
  • [DH] libavcodec/x86/hpeldsp.asm
  • [DH] libavcodec/x86/hpeldsp_vp3.asm
  • [DH] libavcodec/x86/huffyuvdsp.asm
  • [DH] libavcodec/x86/jpeg2000dsp.asm
  • [DH] libavcodec/x86/lossless_videodsp.asm
  • [DH] libavcodec/x86/lossless_videoencdsp.asm
  • [DH] libavcodec/x86/me_cmp.asm
  • [DH] libavcodec/x86/pngdsp.asm
  • [DH] libavcodec/x86/qpel.asm
  • [DH] libavcodec/x86/qpeldsp.asm
  • [DH] libavcodec/x86/rv34dsp.asm
  • [DH] libavcodec/x86/rv40dsp.asm
  • [DH] libavcodec/x86/sbrdsp.asm
  • [DH] libavcodec/x86/takdsp.asm
  • [DH] libavcodec/x86/utvideodsp.asm
  • [DH] libavcodec/x86/v210.asm
  • [DH] libavcodec/x86/vc1dsp_mc.asm
  • [DH] libavcodec/x86/videodsp.asm
  • [DH] libavcodec/x86/vp8dsp.asm
  • [DH] libavfilter/x86/af_volume.asm
  • [DH] libavfilter/x86/avf_showcqt.asm
  • [DH] libavfilter/x86/scene_sad.asm
  • [DH] libavfilter/x86/vf_blend.asm
  • [DH] libavfilter/x86/vf_framerate.asm
  • [DH] libavfilter/x86/vf_gradfun.asm
  • [DH] libavfilter/x86/vf_hqdn3d.asm
  • [DH] libavfilter/x86/vf_interlace.asm
  • [DH] libavfilter/x86/vf_maskedmerge.asm
  • [DH] libavfilter/x86/vf_stereo3d.asm
  • [DH] libavfilter/x86/vf_w3fdif.asm
  • [DH] libavutil/x86/float_dsp.asm
  • [DH] libavutil/x86/lls.asm
  • [DH] libswresample/x86/audio_convert.asm
  • [DH] libswresample/x86/rematrix.asm
  • [DH] libswscale/x86/input.asm
  • [DH] libswscale/x86/output.asm
  • [DH] libswscale/x86/scale.asm
  • [DH] libswscale/x86/scale_avx2.asm
  • [DH] libswscale/x86/yuv2yuvX.asm
  • [DH] libswscale/x86/yuv_2_rgb.asm
  • [DH] tests/checkasm/x86/checkasm.asm

• Convert videos from .264 to .265 (HEVC) with ffmpeg [closed]

  11 août 2024, par John Terragnoli

  I see that there are a few questions on this subject but I am still getting errors. All I want to do is convert videos in my library to HEVC so they take up less space.
  
I've tried this :

  



  ffmpeg -i input.mp4 -c:v libx265 output.mp4


  



  ffmpeg seems to take a long time and the output seems to be about the right size. The video will play with VLC but the icon is weird and when I try to open it with QuickTime, I get the error : 'The document “output.mov” could not be opened. The file isn’t compatible with QuickTime Player.'

  



  I don't want to change any of the fancy settings. I just want the files to take up less space and with minimal or no quality loss.

  



  Thanks !

  



  EDIT : 
Having trouble keeping the time stamp that I put into the videos.
  
Originally I was using exiftool in terminal. But, sometimes that doesn’t work with videos, so I would airdrop them to my iPhone, use an app called Metapho to change the dates, and then airdrop them back. Exiftool was create but sometimes I just wouldn’t work. It would change the date to something like 1109212 Aug 2nd. Weird. Bottom line is that when I do these conversions, I really don’t want lose the time stamps in them.

  



  ORIGINAL FILE THAT I TIMESTAMPED, IN .264

  



  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_original.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2019-10-22T18:48:43.000000Z
    encoder         : HandBrake 0.10.2 2015060900
    com.apple.quicktime.creationdate: 1994-12-25T18:00:00Z
  Duration: 00:01:21.27, start: 0.000000, bitrate: 800 kb/s
    Chapter #0:0: start 0.000000, end 81.265000
    Metadata:
      title           : Chapter 12
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt709, progressive), 710x482 [SAR 58409:65535 DAR 1043348:794715], 634 kb/s, SAR 9172:10291 DAR 404229:307900, 29.95 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2019-10-22T18:48:43.000000Z
      handler_name    : Core Media Video
      encoder         : 'avc1'
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default)
    Metadata:
      creation_time   : 2019-10-22T18:48:43.000000Z
      handler_name    : Core Media Audio
    Stream #0:2(und): Data: bin_data (text / 0x74786574), 0 kb/s
    Metadata:
      creation_time   : 2019-10-22T18:48:43.000000Z
      handler_name    : Core Media Text
At least one output file must be specified


  



  FILE CONVERTED TO HEVC, WITHOUT -COPYTS TAG

  



  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_original_HEVC.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    encoder         : Lavf58.29.100
  Duration: 00:01:21.30, start: 0.000000, bitrate: 494 kb/s
    Chapter #0:0: start 0.000000, end 81.265000
    Metadata:
      title           : Chapter 12
    Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, progressive), 710x482 [SAR 9172:10291 DAR 404229:307900], 356 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 29.97 tbc (default)
    Metadata:
      handler_name    : Core Media Video
      encoder         : Lavc58.54.100 libx265
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
    Stream #0:2(eng): Data: bin_data (text / 0x74786574), 0 kb/s
    Metadata:
      handler_name    : SubtitleHandler
At least one output file must be specified


  



  FILE CONVERTED TO HEVC, WITH -COPYTS TAG

  



  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test_original_HEVC_keepts.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    encoder         : Lavf58.29.100
  Duration: 00:01:21.30, start: 0.000000, bitrate: 494 kb/s
    Chapter #0:0: start 0.000000, end 81.265000
    Metadata:
      title           : Chapter 12
    Stream #0:0: Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, progressive), 710x482 [SAR 9172:10291 DAR 404229:307900], 356 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 29.97 tbc (default)
    Metadata:
      handler_name    : Core Media Video
      encoder         : Lavc58.54.100 libx265
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : Core Media Audio
    Stream #0:2(eng): Data: bin_data (text / 0x74786574), 0 kb/s
    Metadata:
      handler_name    : SubtitleHandler
At least one output file must be specified


  


• FFMPEG. Read frame, process it, put it to output video. Copy sound stream unchanged

  9 décembre 2016, par Andrey Smorodov

  I want to apply processing to a video clip with sound track, extract and process frame by frame and write result to output file. Number of frames, size of frame and speed remains unchanged in output clip. Also I want to keep the same audio track as I have in source.

  I can read clip, decode frames and process then using opencv. Audio packets are also writes fine. I’m stuck on forming output video stream.

  The minimal runnable code I have for now (sorry it not so short, but cant do it shorter) :

  extern "C" {
  
  #include <libavutil></libavutil>timestamp.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include "libavcodec/avcodec.h"
  
  #include <libavutil></libavutil>opt.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  }
  
  #include "opencv2/opencv.hpp"
  
  
  
  #if LIBAVCODEC_VERSION_INT &lt; AV_VERSION_INT(55,28,1)
  
  #define av_frame_alloc  avcodec_alloc_frame
  
  #endif
  
  
  
  using namespace std;
  
  using namespace cv;
  
  
  
  static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, const char *tag)
  
  {
  
      AVRational *time_base = &amp;fmt_ctx->streams[pkt->stream_index]->time_base;
  
  
  
      char buf1[AV_TS_MAX_STRING_SIZE] = { 0 };
  
      av_ts_make_string(buf1, pkt->pts);
  
      char buf2[AV_TS_MAX_STRING_SIZE] = { 0 };
  
      av_ts_make_string(buf1, pkt->dts);
  
      char buf3[AV_TS_MAX_STRING_SIZE] = { 0 };
  
      av_ts_make_string(buf1, pkt->duration);
  
  
  
      char buf4[AV_TS_MAX_STRING_SIZE] = { 0 };
  
      av_ts_make_time_string(buf1, pkt->pts, time_base);
  
      char buf5[AV_TS_MAX_STRING_SIZE] = { 0 };
  
      av_ts_make_time_string(buf1, pkt->dts, time_base);
  
      char buf6[AV_TS_MAX_STRING_SIZE] = { 0 };
  
      av_ts_make_time_string(buf1, pkt->duration, time_base);
  
  
  
      printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
  
          buf1, buf4,
  
          buf2, buf5,
  
          buf3, buf6,
  
          pkt->stream_index);
  
  
  
  }
  
  
  
  
  
  int main(int argc, char **argv)
  
  {
  
      AVOutputFormat *ofmt = NULL;
  
      AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
  
      AVPacket pkt;
  
      AVFrame *pFrame = NULL;
  
      AVFrame *pFrameRGB = NULL;
  
      int frameFinished = 0;
  
      pFrame = av_frame_alloc();
  
      pFrameRGB = av_frame_alloc();
  
  
  
      const char *in_filename, *out_filename;
  
      int ret, i;
  
      in_filename = "../../TestClips/Audio Video Sync Test.mp4";
  
      out_filename = "out.mp4";
  
  
  
      // Initialize FFMPEG
  
      av_register_all();
  
      // Get input file format context
  
      if ((ret = avformat_open_input(&amp;ifmt_ctx, in_filename, 0, 0)) &lt; 0)
  
      {
  
          fprintf(stderr, "Could not open input file '%s'", in_filename);
  
          goto end;
  
      }
  
      // Extract streams description
  
      if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) &lt; 0)
  
      {
  
          fprintf(stderr, "Failed to retrieve input stream information");
  
          goto end;
  
      }
  
      // Print detailed information about the input or output format,
  
      // such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.
  
      av_dump_format(ifmt_ctx, 0, in_filename, 0);
  
  
  
      // Allocate an AVFormatContext for an output format.
  
      avformat_alloc_output_context2(&amp;ofmt_ctx, NULL, NULL, out_filename);
  
      if (!ofmt_ctx)
  
      {
  
          fprintf(stderr, "Could not create output context\n");
  
          ret = AVERROR_UNKNOWN;
  
          goto end;
  
      }
  
  
  
      // The output container format.
  
      ofmt = ofmt_ctx->oformat;
  
  
  
      // Allocating output streams
  
      for (i = 0; i &lt; ifmt_ctx->nb_streams; i++)
  
      {
  
          AVStream *in_stream = ifmt_ctx->streams[i];
  
          AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
  
          if (!out_stream)
  
          {
  
              fprintf(stderr, "Failed allocating output stream\n");
  
              ret = AVERROR_UNKNOWN;
  
              goto end;
  
          }
  
          ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
  
          if (ret &lt; 0)
  
          {
  
              fprintf(stderr, "Failed to copy context from input to output stream codec context\n");
  
              goto end;
  
          }
  
          out_stream->codec->codec_tag = 0;
  
          if (ofmt_ctx->oformat->flags &amp; AVFMT_GLOBALHEADER)
  
          {
  
              out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
          }
  
      }
  
  
  
      // Show output format info
  
      av_dump_format(ofmt_ctx, 0, out_filename, 1);
  
  
  
      // Open output file
  
      if (!(ofmt->flags &amp; AVFMT_NOFILE))
  
      {
  
          ret = avio_open(&amp;ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
  
          if (ret &lt; 0)
  
          {
  
              fprintf(stderr, "Could not open output file '%s'", out_filename);
  
              goto end;
  
          }
  
      }
  
      // Write output file header
  
      ret = avformat_write_header(ofmt_ctx, NULL);
  
      if (ret &lt; 0)
  
      {
  
          fprintf(stderr, "Error occurred when opening output file\n");
  
          goto end;
  
      }
  
  
  
      // Search for input video codec info
  
      AVCodec *in_codec = nullptr;
  
      AVCodecContext* avctx = nullptr;
  
  
  
      int video_stream_index = -1;
  
      for (int i = 0; i &lt; ifmt_ctx->nb_streams; i++)
  
      {
  
          if (ifmt_ctx->streams[i]->codec->coder_type == AVMEDIA_TYPE_VIDEO)
  
          {
  
              video_stream_index = i;
  
              avctx = ifmt_ctx->streams[i]->codec;
  
              in_codec = avcodec_find_decoder(avctx->codec_id);
  
              if (!in_codec)
  
              {
  
                  fprintf(stderr, "in codec not found\n");
  
                  exit(1);
  
              }
  
              break;
  
          }
  
      }
  
  
  
      // Search for output video codec info
  
      AVCodec *out_codec = nullptr;
  
      AVCodecContext* o_avctx = nullptr;
  
  
  
      int o_video_stream_index = -1;
  
      for (int i = 0; i &lt; ofmt_ctx->nb_streams; i++)
  
      {
  
          if (ofmt_ctx->streams[i]->codec->coder_type == AVMEDIA_TYPE_VIDEO)
  
          {
  
              o_video_stream_index = i;
  
              o_avctx = ofmt_ctx->streams[i]->codec;
  
              out_codec = avcodec_find_encoder(o_avctx->codec_id);
  
              if (!out_codec)
  
              {
  
                  fprintf(stderr, "out codec not found\n");
  
                  exit(1);
  
              }
  
              break;
  
          }
  
      }
  
  
  
      // openCV pixel format
  
      AVPixelFormat pFormat = AV_PIX_FMT_RGB24;
  
      // Data size
  
      int numBytes = avpicture_get_size(pFormat, avctx->width, avctx->height);
  
      // allocate buffer 
  
      uint8_t *buffer = (uint8_t *)av_malloc(numBytes * sizeof(uint8_t));
  
      // fill frame structure
  
      avpicture_fill((AVPicture *)pFrameRGB, buffer, pFormat, avctx->width, avctx->height);
  
      // frame area
  
      int y_size = avctx->width * avctx->height;
  
      // Open input codec
  
      avcodec_open2(avctx, in_codec, NULL);
  
      // Main loop
  
      while (1)
  
      {
  
          AVStream *in_stream, *out_stream;
  
          ret = av_read_frame(ifmt_ctx, &amp;pkt);
  
          if (ret &lt; 0)
  
          {
  
              break;
  
          }
  
          in_stream = ifmt_ctx->streams[pkt.stream_index];
  
          out_stream = ofmt_ctx->streams[pkt.stream_index];
  
          log_packet(ifmt_ctx, &amp;pkt, "in");
  
          // copy packet 
  
          pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
  
          pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AVRounding(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
  
          pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
  
          pkt.pos = -1;
  
  
  
          log_packet(ofmt_ctx, &amp;pkt, "out");
  
          if (pkt.stream_index == video_stream_index)
  
          {
  
              avcodec_decode_video2(avctx, pFrame, &amp;frameFinished, &amp;pkt);
  
              if (frameFinished)
  
              {
  
                  struct SwsContext *img_convert_ctx;
  
                  img_convert_ctx = sws_getCachedContext(NULL,
  
                      avctx->width,
  
                      avctx->height,
  
                      avctx->pix_fmt,
  
                      avctx->width,
  
                      avctx->height,
  
                      AV_PIX_FMT_BGR24,
  
                      SWS_BICUBIC,
  
                      NULL,
  
                      NULL,
  
                      NULL);
  
                  sws_scale(img_convert_ctx,
  
                      ((AVPicture*)pFrame)->data,
  
                      ((AVPicture*)pFrame)->linesize,
  
                      0,
  
                      avctx->height,
  
                      ((AVPicture *)pFrameRGB)->data,
  
                      ((AVPicture *)pFrameRGB)->linesize);
  
  
  
                  sws_freeContext(img_convert_ctx);
  
  
  
                  // Do some image processing
  
                  cv::Mat img(pFrame->height, pFrame->width, CV_8UC3, pFrameRGB->data[0],false);
  
                  cv::GaussianBlur(img,img,Size(5,5),3);
  
                  cv::imshow("Display", img);
  
                  cv::waitKey(5);
  
                  // --------------------------------
  
                  // Transform back to initial format
  
                  // --------------------------------
  
                  img_convert_ctx = sws_getCachedContext(NULL,
  
                      avctx->width,
  
                      avctx->height,
  
                      AV_PIX_FMT_BGR24,
  
                      avctx->width,
  
                      avctx->height,
  
                      avctx->pix_fmt,
  
                      SWS_BICUBIC,
  
                      NULL,
  
                      NULL,
  
                      NULL);
  
                  sws_scale(img_convert_ctx,
  
                      ((AVPicture*)pFrameRGB)->data,
  
                      ((AVPicture*)pFrameRGB)->linesize,
  
                      0,
  
                      avctx->height,
  
                      ((AVPicture *)pFrame)->data,
  
                      ((AVPicture *)pFrame)->linesize);
  
                      // --------------------------------------------
  
                      // Something must be here
  
                      // --------------------------------------------
  
                      //
  
                      // Write fideo frame (How to write frame to output stream ?)
  
                      //
  
                      // --------------------------------------------
  
                       sws_freeContext(img_convert_ctx);
  
              }
  
  
  
          }
  
          else // write sound frame
  
          {
  
              ret = av_interleaved_write_frame(ofmt_ctx, &amp;pkt);
  
          }
  
          if (ret &lt; 0)
  
          {
  
              fprintf(stderr, "Error muxing packet\n");
  
              break;
  
          }
  
          // Decrease packet ref counter
  
          av_packet_unref(&amp;pkt);
  
      }
  
      av_write_trailer(ofmt_ctx);
  
  end:
  
      avformat_close_input(&amp;ifmt_ctx);
  
      // close output 
  
      if (ofmt_ctx &amp;&amp; !(ofmt->flags &amp; AVFMT_NOFILE))
  
      {
  
          avio_closep(&amp;ofmt_ctx->pb);
  
      }
  
      avformat_free_context(ofmt_ctx);
  
      if (ret &lt; 0 &amp;&amp; ret != AVERROR_EOF)
  
      {
  
          char buf_err[AV_ERROR_MAX_STRING_SIZE] = { 0 };
  
          av_make_error_string(buf_err, AV_ERROR_MAX_STRING_SIZE, ret);
  
          fprintf(stderr, "Error occurred: %s\n", buf_err);
  
          return 1;
  
      }
  
  
  
      avcodec_close(avctx);
  
      av_free(pFrame);
  
      av_free(pFrameRGB);
  
  
  
      return 0;
  
  }