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• ffmpeg / ffprobe gives creation_time 1970 but actual timestamp is correct

  12 juillet 2017, par smian

  I’d gotten some video recorded from a surveillance cam, and in the recording itself, the correct timestamp is clearly shown in a corner.

  I wanted to extract the creation time from the video metadata, however ffmpeg (and ffprobe) both give me creation_time as creation_time:1970-01-01T00:33:37.000000Z (i.e the unix epoch time)

  (tested with ffmpeg -i <video></video> and ffprobe -v quiet -print_format compact -show_entries format_tags=creation_time <video></video>, where <video></video> is the location of video)

  Any way to fix this ? I have confirmed that the settings on the camera are fine. I need to use ffmpeg for other analysis.

• gstreamer : Internal data error, in appsink "pull-sample" mode

  9 mai 2018, par Amir Raza

  I am getting Internal data error, in appsink .
  My application is to read .yuv data , encode and write to a buffer.

  I have accomplished the writing it file but when i changed the code to write it buffer it giving error.
  Its only able to write only single packet (188bytes).

  Output of program :

   (ConsoleApplication6.exe:14432): GStreamer-WARNING **: Failed to load plugin 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\libgstopenh264.dll': 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\libgstopenh264.dll': The specified procedure could not be found.
  
      pipeline:  filesrc location=Transformers1080p.yuv blocksize=4147200 ! videoparse  width=1920 height=1080 framerate=60/1 ! videoconvert ! video/x-raw,format=I420,width=1920,height=1080,framerate=60/1 !  x264enc ! mpegtsmux ! queue !  appsink name = sink
  
      Now playing: Transformers1080p.yuv
  
      Running...
  
  
  
       on_new_sample_from_sink
  
  
  
       sample got of size = 188
  
      Error: Internal data stream error.
  
      Returned, stopping playback
  
      Deleting pipeline

  my code :

  #define _CRT_SECURE_NO_WARNINGS 1
  
  //#pragma warning(disable:4996)
  
  #include <gst></gst>gst.h>
  
  #include <gst></gst>audio/audio.h>
  
  #include <gst></gst>app/gstappsrc.h>
  
  #include <gst></gst>base/gstpushsrc.h>
  
  #include <gst></gst>app/gstappsink.h>
  
  #include <gst></gst>video/video.h>
  
  #include <gst></gst>video/gstvideometa.h>
  
  #include <gst></gst>video/video-overlay-composition.h>
  
  
  
  #include 
  
  #include 
  
  
  
  #include 
  
  #include 
  
  
  
  using namespace std;
  
  
  
  GstElement *SinkBuff;
  
  char *out_file_path;
  
  FILE *out_file;
  
  
  
  //gst-launch-1.0.exe -v filesrc location=Transformers1080p.yuv blocksize=4147200 !  
  
  //videoconvert ! video/x-raw,format=I420,width=1920,height=1080,framerate=60/1 !  
  
  //openh264enc ! mpegtsmux ! filesink location=final.ts
  
  
  
  
  
  static gboolean bus_call(GstBus     *bus, GstMessage *msg, gpointer    data)
  
  {
  
          GMainLoop *loop = (GMainLoop *)data;
  
  
  
          switch (GST_MESSAGE_TYPE(msg))
  
          {
  
          case GST_MESSAGE_EOS:
  
                  g_print("End of stream\n");
  
                  g_main_loop_quit(loop);
  
                  break;
  
  
  
          case GST_MESSAGE_ERROR:
  
            {
  
                  gchar  *debug;
  
                  GError *error;
  
  
  
                  gst_message_parse_error(msg, &amp;error, &amp;debug);
  
                  g_free(debug);
  
  
  
                  g_printerr("Error: %s\n", error->message);
  
                  g_error_free(error);
  
  
  
                  g_main_loop_quit(loop);
  
                  break;
  
            }
  
          default:
  
                  break;
  
      }
  
          return TRUE;
  
  }
  
  
  
  /* called when the appsink notifies us that there is a new buffer ready for
  
  * processing */
  
  static void  on_new_sample_from_sink(GstElement * elt, void *ptr)
  
  {
  
          guint size;
  
          GstBuffer *app_buffer, *buffer;
  
          GstElement *source;
  
          GstMapInfo map = { 0 };
  
          GstSample *sample;
  
          static GstClockTime timestamp = 0;
  
          printf("\n on_new_sample_from_sink \n ");
  
          /* get the buffer from appsink */
  
          g_signal_emit_by_name(SinkBuff, "pull-sample", &amp;sample, NULL);
  
          if (sample)
  
          {
  
                  buffer = gst_sample_get_buffer(sample);
  
                  gst_buffer_map(buffer, &amp;map, GST_MAP_READ);
  
  
  
                  printf("\n sample got of size = %d \n", map.size);
  
                  //Buffer
  
                  fwrite((char *)map.data, 1, sizeof(map.size), out_file);
  
  
  
                  gst_buffer_unmap(buffer, &amp;map);
  
                  gst_sample_unref(sample);
  
          }
  
  }
  
  
  
  
  
  int main(int   argc, char *argv[])
  
  {
  
          GMainLoop *loop;
  
          int width, height;
  
  
  
          GstElement *pipeline;
  
          GError *error = NULL;
  
          GstBus *bus;
  
          char pipeline_desc[1024];
  
          out_file = fopen("output.ts", "wb");
  
  
  
  
  
          /* Initialisation */
  
          gst_init(&amp;argc, &amp;argv);
  
  
  
          // Create gstreamer loop
  
          loop = g_main_loop_new(NULL, FALSE);
  
  
  
          sprintf(
  
                  pipeline_desc,
  
                  " filesrc location=Transformers1080p.yuv blocksize=4147200 !"
  
                  " videoparse  width=1920 height=1080 framerate=60/1 !"
  
                  " videoconvert ! video/x-raw,format=I420,width=1920,height=1080,framerate=60/1 ! "
  
                  //" x264enc ! mpegtsmux ! filesink location=final.ts");
  
                  " x264enc ! mpegtsmux ! queue !  appsink name = sink");
  
  
  
  
  
          printf("pipeline: %s\n", pipeline_desc);
  
  
  
          /* Create gstreamer elements */
  
          pipeline = gst_parse_launch(pipeline_desc, &amp;error);
  
  
  
          /* TODO: Handle recoverable errors. */
  
  
  
          if (!pipeline) {
  
                  g_printerr("Pipeline could not be created. Exiting.\n");
  
                  return -1;
  
          }
  
  
  
          /* get sink */
  
          SinkBuff = gst_bin_get_by_name(GST_BIN(pipeline), "sink");
  
          g_object_set(G_OBJECT(SinkBuff), "emit-signals", TRUE, "sync", FALSE, NULL);
  
          g_signal_connect(SinkBuff, "new-sample", G_CALLBACK(on_new_sample_from_sink), NULL);
  
  
  
  
  
          /* Set up the pipeline */
  
          /* we add a message handler */
  
          bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
  
          gst_bus_add_watch(bus, bus_call, loop);
  
          gst_object_unref(bus);
  
  
  
          /* Set the pipeline to "playing" state*/
  
          g_print("Now playing: Transformers1080p.yuv \n");
  
          gst_element_set_state(pipeline, GST_STATE_PLAYING);
  
  
  
          /* Iterate */
  
          g_print("Running...\n");
  
          g_main_loop_run(loop);
  
  
  
          /* Out of the main loop, clean up nicely */
  
          g_print("Returned, stopping playback\n");
  
          gst_element_set_state(pipeline, GST_STATE_NULL);
  
  
  
          g_print("Deleting pipeline\n");
  
          gst_object_unref(GST_OBJECT(pipeline));
  
          fclose(out_file);
  
          g_main_loop_unref(loop);
  
  
  
  
  
          return 0;
  
  } 

• lavd/gdigrab : mouse dpi awareness

  15 février 2016, par Metaksakis Georgios

  lavd/gdigrab : mouse dpi awareness
  correct mouse location on hidpi screens.
  
  fixes ticket #5008
  Signed-off-by : Matt Oliver <protogonoi@gmail.com>
  

  • [DH] libavdevice/gdigrab.c