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• seeking with av_seek_frame returns invalid data

  27 juin 2016, par mtadmk

  Based on dranger tutorial I’m trying to implement seeking in video file. Problem is with seeking to beginning milliseconds - it always returns 0 when seeking backward, or some place in file (based on file format).

  I.e. with this video file and seeking forward to 500 pts there is always 6163 pts returned. Seeking backward to 500 is always returning 0. I have no idea why.

  Code to do this :

  import java.util.Arrays;
  
  import java.util.List;
  
  import org.bytedeco.javacpp.BytePointer;
  
  import org.bytedeco.javacpp.DoublePointer;
  
  import org.bytedeco.javacpp.PointerPointer;
  
  import org.bytedeco.javacpp.avcodec;
  
  import org.bytedeco.javacpp.avformat;
  
  import org.bytedeco.javacpp.avutil;
  
  import org.bytedeco.javacpp.swscale;
  
  
  
  import static org.bytedeco.javacpp.avcodec.av_free_packet;
  
  import static org.bytedeco.javacpp.avcodec.avcodec_close;
  
  import static org.bytedeco.javacpp.avcodec.avcodec_decode_video2;
  
  import static org.bytedeco.javacpp.avcodec.avcodec_find_decoder;
  
  import static org.bytedeco.javacpp.avcodec.avcodec_flush_buffers;
  
  import static org.bytedeco.javacpp.avcodec.avcodec_open2;
  
  import static org.bytedeco.javacpp.avcodec.avpicture_fill;
  
  import static org.bytedeco.javacpp.avcodec.avpicture_get_size;
  
  import static org.bytedeco.javacpp.avformat.AVSEEK_FLAG_BACKWARD;
  
  import static org.bytedeco.javacpp.avformat.av_dump_format;
  
  import static org.bytedeco.javacpp.avformat.av_read_frame;
  
  import static org.bytedeco.javacpp.avformat.av_register_all;
  
  import static org.bytedeco.javacpp.avformat.av_seek_frame;
  
  import static org.bytedeco.javacpp.avformat.avformat_close_input;
  
  import static org.bytedeco.javacpp.avformat.avformat_find_stream_info;
  
  import static org.bytedeco.javacpp.avformat.avformat_open_input;
  
  import static org.bytedeco.javacpp.avutil.AVMEDIA_TYPE_VIDEO;
  
  import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_RGB24;
  
  import static org.bytedeco.javacpp.avutil.AV_TIME_BASE;
  
  import static org.bytedeco.javacpp.avutil.av_frame_alloc;
  
  import static org.bytedeco.javacpp.avutil.av_frame_get_best_effort_timestamp;
  
  import static org.bytedeco.javacpp.avutil.av_free;
  
  import static org.bytedeco.javacpp.avutil.av_make_q;
  
  import static org.bytedeco.javacpp.avutil.av_malloc;
  
  import static org.bytedeco.javacpp.avutil.av_q2d;
  
  import static org.bytedeco.javacpp.avutil.av_rescale_q;
  
  import static org.bytedeco.javacpp.swscale.SWS_BILINEAR;
  
  import static org.bytedeco.javacpp.swscale.sws_getContext;
  
  import static org.bytedeco.javacpp.swscale.sws_scale;
  
  
  
  public class SeekTest1 {
  
      private avformat.AVFormatContext videoFile;
  
      private final avcodec.AVPacket framePacket = new avcodec.AVPacket();
  
      private avcodec.AVCodecContext videoCodec;
  
      private avutil.AVFrame yuvFrame;
  
      private swscale.SwsContext scalingContext;
  
      private avutil.AVFrame rgbFrame;
  
      private int streamId;
  
      private long lastTime;
  
  
  
      public static void main(String[] args) {
  
          if (args.length > 0) {
  
              new SeekTest1().start(args[0]);
  
          } else {
  
              new SeekTest1().start("/path/to/file");
  
          }
  
  
  
      }
  
  
  
      private void start(String path) {
  
          init(path);
  
          //test for forward
  
  //        List<integer> seekPos = Arrays.asList(0, 100, 0, 200, 0, 300, 0, 400, 0, 500, 0, 600, 0, 700);
  
          //test for backward
  
          List<integer> seekPos = Arrays.asList(10000, 8000, 10000, 7000, 10000, 6000, 10000, 4000, 10000, 2000, 10000, 1000, 10000, 200);
  
          seekPos.forEach(seekPosition -> {
  
              readFrame();
  
              seek(seekPosition);
  
          });
  
          readFrame();
  
          cleanUp();
  
      }
  
  
  
      long seek(long seekPosition) {
  
          final avutil.AVRational timeBase = fetchTimeBase();
  
          long timeInBaseUnit = fetchTimeInBaseUnit(seekPosition, timeBase);
  
  
  
          //changing flag to AVSEEK_FLAG_ANY does not change behavior
  
          int flag = 0;
  
          if (timeInBaseUnit &lt; lastTime) {
  
              flag = AVSEEK_FLAG_BACKWARD;
  
              System.out.println("seeking backward to " + timeInBaseUnit);
  
          } else {
  
              System.out.println("seeking forward to " + timeInBaseUnit);
  
          }
  
          avcodec_flush_buffers(videoCodec);
  
          av_seek_frame(videoFile, streamId, timeInBaseUnit, flag);
  
          return timeInBaseUnit;
  
      }
  
  
  
      private long fetchTimeInBaseUnit(long seekPositionMillis, avutil.AVRational timeBase) {
  
          return av_rescale_q((long) (seekPositionMillis / 1000.0 * AV_TIME_BASE), av_make_q(1, AV_TIME_BASE), timeBase);
  
      }
  
  
  
      private void readFrame() {
  
          while (av_read_frame(videoFile, framePacket) >= 0) {
  
              if (framePacket.stream_index() == streamId) {
  
                  // Decode video frame
  
                  final int[] frameFinished = new int[1];
  
                  avcodec_decode_video2(this.videoCodec, yuvFrame, frameFinished, framePacket);
  
  
  
                  if (frameFinished[0] != 0) {
  
                      av_free_packet(framePacket);
  
                      long millis = produceFinishedFrame();
  
                      System.out.println("produced time " + millis);
  
                      break;
  
                  }
  
              }
  
              av_free_packet(framePacket);
  
          }
  
      }
  
  
  
      private long produceFinishedFrame() {
  
          sws_scale(scalingContext, yuvFrame.data(), yuvFrame.linesize(), 0,
  
              videoCodec.height(), rgbFrame.data(), rgbFrame.linesize());
  
          final long pts = av_frame_get_best_effort_timestamp(yuvFrame);
  
          final double timeBase = av_q2d(fetchTimeBase());
  
          final long foundMillis = (long) (pts * 1000 * timeBase);
  
          lastTime = foundMillis;
  
          return foundMillis;
  
      }
  
  
  
      private avutil.AVRational fetchTimeBase() {
  
          return videoFile.streams(streamId).time_base();
  
      }
  
  
  
      private void init(String videoPath) {
  
          final avformat.AVFormatContext videoFile = new avformat.AVFormatContext(null);
  
  
  
          av_register_all();
  
          if (avformat_open_input(videoFile, videoPath, null, null) != 0) throw new RuntimeException("unable to open");
  
          if (avformat_find_stream_info(videoFile, (PointerPointer) null) &lt; 0) throw new RuntimeException("Couldn't find stream information");
  
  
  
          av_dump_format(videoFile, 0, videoPath, 0);
  
  
  
          final int streamId = findFirstVideoStream(videoFile);
  
  
  
          final avcodec.AVCodecContext codec = videoFile.streams(streamId).codec();
  
  
  
          final avcodec.AVCodec pCodec = avcodec_find_decoder(codec.codec_id());
  
          if (pCodec == null) throw new RuntimeException("Unsupported codec");
  
  
  
          if (avcodec_open2(codec, pCodec, (avutil.AVDictionary) null) &lt; 0) throw new RuntimeException("Could not open codec");
  
  
  
          final avutil.AVFrame yuvFrame = av_frame_alloc();
  
  
  
          final avutil.AVFrame rgbFrame = av_frame_alloc();
  
          if (rgbFrame == null) throw new RuntimeException("Can't allocate avframe");
  
  
  
          final int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24, codec.width(), codec.height());
  
          final BytePointer frameBuffer = new BytePointer(av_malloc(numBytes));
  
  
  
          final swscale.SwsContext swsContext = sws_getContext(codec.width(), codec.height(), codec.pix_fmt(), codec.width(), codec.height(),
  
              AV_PIX_FMT_RGB24, SWS_BILINEAR, null, null, (DoublePointer) null);
  
  
  
          avpicture_fill(new avcodec.AVPicture(rgbFrame), frameBuffer, AV_PIX_FMT_RGB24, codec.width(), codec.height());
  
  
  
          this.videoFile = videoFile;
  
          this.videoCodec = codec;
  
          this.yuvFrame = yuvFrame;
  
          this.scalingContext = swsContext;
  
          this.rgbFrame = rgbFrame;
  
          this.streamId = streamId;
  
      }
  
  
  
      private static int findFirstVideoStream(avformat.AVFormatContext videoFile) {
  
          int videoStream = -1;
  
          for (int i = 0; i &lt; videoFile.nb_streams(); i++) {
  
              if (videoFile.streams(i).codec().codec_type() == AVMEDIA_TYPE_VIDEO) {
  
                  videoStream = i;
  
                  break;
  
              }
  
          }
  
          if (videoStream == -1) throw new RuntimeException("Didn't find video stream");
  
          return videoStream;
  
      }
  
  
  
      private void cleanUp() {
  
          av_free(this.rgbFrame);
  
          av_free(yuvFrame);
  
          avcodec_close(videoCodec);
  
          avformat_close_input(videoFile);
  
      }
  
  }
  
  </integer></integer>

  As input arg should be provided file from above.

• FFMPEG returns the wrong time

  22 juillet 2016, par GeeHopper

  I’m currently trying to cut a file using ffmpeg with the following command : "ffmpeg -sseof -10 -i resourcefile.mp4 -c copy cuttedfile.mp4" but for some reason the new file length is more than 10 seconds (around 15). So now I’m wondering if this is a bug, since this should cut the last 10 seconds in a new file.

  Thanks for the help :)

• Error finding watermark path using ffmpeg in asp.net application

  27 août 2013, par irfanmcsd

  I am using .net ffmpeg wrapper to post watermark on videos. Posting watermark works fine if i execute ffmpeg command directly but failed to find suitable watermark png file location if command executed via asp.net application.

  here is sample ffmpeg command

  string RootPath = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath);
  
  _mhandler.FFMPEGPath = RootPath + "/ffmpeg_aug_2013/bin/ffmpeg.exe";
  
  _mhandler.InputPath = RootPath + "/contents/original";
  
  _mhandler.OutputPath = RootPath + "/contents/mp4";
  
  _mhandler.BackgroundProcessing = false;
  
  _mhandler.FileName = "wildlife.wmv";
  
  _mhandler.OutputFileName = "wildlife_ddd";
  
  string presetpath = RootPath + "/ffmpeg_aug_2013/presets/libx264-ipod640.ffpreset";
  
  _mhandler.OutputExtension = ".mp4";
  
  _mhandler.Parameters = "-s 640x380 -b:v 500k -bufsize 500k -b:a 128k -ar 44100 -c:v libx264 -vf \"movie = watermark.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]\"";
  
  _mhandler.Parameters = _mhandler.Parameters + " -fpre \"" + presetpath + "\"";
  
  VideoInfo info =  _mhandler.Process();

  i tried direct code too

  string _out = "";
  
  Process _process = new Process();
  
  _process.StartInfo.UseShellExecute = false;
  
  _process.StartInfo.RedirectStandardInput = true;
  
  //_process.StartInfo.RedirectStandardOutput = true;
  
  _process.StartInfo.RedirectStandardError = true;
  
  _process.StartInfo.CreateNoWindow = true;
  
  _process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
  
  _process.StartInfo.FileName = _ffmpegpath;
  
  _process.StartInfo.Arguments = cmd;
  
  if (_process.Start())
  
  {             
  
      _process.WaitForExit(ExitProcess);
  
      _out = _process.StandardError.ReadToEnd();
  
      if (!_process.HasExited)
  
        _process.Kill();
  
  
  
      return _out;
  
   }

  ffmpeg error output as

  FFMPEG Output:ffmpeg version N-55753-g88909be Copyright (c) 2000-2013
  the FFmpeg developers built on Aug 24 2013 21:40:51 with gcc 4.7.3
  (GCC) configuration : —enable-gpl —enable-version3
  —disable-w32threads —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libcaca —enable-libfreetype —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvo-aacenc —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libxavs —enable-libxvid —enable-zlib libavutil 52. 42.100 / 52. 42.100 libavcodec 55. 29.100 / 55. 29.100 libavformat 55. 14.102 / 55. 14.102 libavdevice 55. 3.100
  / 55. 3.100 libavfilter 3. 82.102 / 3. 82.102 libswscale 2. 5.100 / 2.
  5.100 libswresample 0. 17.103 / 0. 17.103 libpostproc 52. 3.100 / 52. 3.100 [asf @ 024c9960] Stream #0 : not enough frames to estimate rate ; consider increasing probesize Guessed Channel Layout for Input Stream

  0.0 : stereo Input #0, asf, from 'F :\own\mhp_new/contents/original\wildlife.wmv' : Metadata :

  SfOriginalFPS : 299700 WMFSDKVersion : 11.0.6001.7000 WMFSDKNeeded :
  0.0.0.0000 comment : Footage : Small World Productions, Inc ; Tourism New Zealand | Producer : Gary F. Spradling | Music : Steve Ball title :
  Wildlife in HD copyright : © 2008 Microsoft Corporation IsVBR : 0
  DeviceConformanceTemplate : AP@L3 Duration : 00:00:30.09, start :
  0.000000, bitrate : 6977 kb/s Stream #0:0(eng) : Audio : wmav2 (a1[0][0] / 0x0161), 44100 Hz, stereo, fltp, 192 kb/s Stream

  0:1(eng) : Video : vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc [image2 @ 024c76e0]

  Could find no file with path 'watermark.png' and index in the range
  0-4 [Parsed_movie_0 @ 024c0540] Failed to avformat_open_input
  'watermark.png' [AVFilterGraph @ 024ca100] Error initializing filter
  'movie' with args 'watermark.png' Error opening filters ! Error Code= 0

  Error on point ( Could find no file with path 'watermark.png' ) shows watermark.png file not found.
  I place watermark.png file in the following locations but still can't found

  i : application root

  ii : root where actual aspx page located

  iii : ffmpeg root

  iv : ffmpeg/bin/

  I also used complete path but still can't detected.

  Note : if i use same ffmpeg command in php and place watermark.png on location where actual php page exist watermark properly detected and command executed properly, but same approach not working in asp.net

  Can any one help me where should i place watermark.png file so that script can access it.