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• ffmpeg - Determine what parameters

  27 juin 2018, par AdmiralJonB

  I’ve got a video file that I’m trying to determine what parameters I can use to reproduce the encoding with ffmpeg.

  Here’s the ffprobe of the particular stream in question.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4': Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.51.107   
  
  Duration: 00:05:02.84, start: 0.000000, bitrate: 4324 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4323 kb/s, 25 fps, 25 tbr, 1200k tbn, 2400k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  The key part is that I’m noticing that the bitrate is quite low at 4324 kb/s, but this is actually an incredibly high quality video. To approach this sort of quality, I’ve only been able to make videos at 40000 kb/s (which is a huge increase in filesize). I also notice that it mentions yuvj420p which is an image format, but I have no idea what parameters with ffmpeg could produce that image format (if this at all would make a difference).

  Would appreciate any help I can get.

  Edit :

  Here’s the output based on the comment below :

  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=Main
  
  codec_type=video
  
  codec_time_base=123187/3701760
  
  codec_tag_string=avc1
  
  codec_tag=0x31637661
  
  width=1920
  
  height=1080
  
  coded_width=1920
  
  coded_height=1080
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=16:9
  
  pix_fmt=yuvj420p
  
  level=41
  
  color_range=pc
  
  color_space=bt709
  
  color_transfer=bt709
  
  color_primaries=bt709
  
  chroma_location=center
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  is_avc=true
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=15/1
  
  avg_frame_rate=1850880/123187
  
  time_base=1/15360
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=246374
  
  duration=16.039974
  
  bit_rate=13795677
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=8
  
  nb_frames=241
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=1
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:language=und
  
  TAG:handler_name=VideoHandler
  
  [/STREAM]

  Edit 2 :

  Here’s information from mediainfo

  Video
  
  ID                                       : 1
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : Main@L4.1
  
  Format settings, CABAC                   : Yes
  
  Format settings, RefFrames               : 1 frame
  
  Format settings, GOP                     : M=1, N=32
  
  Codec ID                                 : avc1
  
  Codec ID/Info                            : Advanced Video Coding
  
  Duration                                 : 5 min 2 s
  
  Bit rate                                 : 4 323 kb/s
  
  Width                                    : 1 920 pixels
  
  Height                                   : 1 080 pixels
  
  Display aspect ratio                     : 16:9
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 25.000 FPS
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.083
  
  Stream size                              : 156 MiB (100%)
  
  Color range                              : Full
  
  Color primaries                          : BT.709
  
  Transfer characteristics                 : BT.709
  
  Matrix coefficients                      : BT.709

• 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;
  
  } 

• youtube-dl - How do I ensure that the "original" video formats are downloaded ?

  25 juin 2018, par Schytheron

  I am building a C# GUI (Windows only) for youtube-dl where I allow the user to pick the desired video quality and framerate but I am having problems with format selection. youtube-dl sometimes downloads either the wrong video file or the wrong audio file (often it is audio) and after merging them I end up with a .mkv file because according to FFmpeg the files I am trying to merge are incompatible.

  These are the format selection queries I have tried to far :

  bestvideo[height<=?%height%][fps<=?%fps%]+bestaudio/best

  and

  public string[] qualities = { "4320", "2160", "1440", "1080", "720", "480", "360", "240", "144" };
  
  public string[] framerates = { "60", "50", "48", "30", "24" };
  
  private void buildFormat(int qualSkip,int fpsSkip)
  
          {
  
              string[] qualitiesMin = qualities.Skip(qualSkip).ToArray();
  
              string[] frameratesMin = framerates.Skip(fpsSkip).ToArray();
  
              format = "-f ";
  
              foreach (string quality in qualitiesMin)
  
              {
  
                  foreach (string framerate in frameratesMin)
  
                  {
  
                      format += "bestvideo[height=?" + quality + "][fps=?" + framerate + "]+bestaudio/";
  
                  }
  
              }
  
              format += "best";
  
          }

  In the first one I had a problem where on some videos youtube-dl downloaded a video in a lower framerate than what I requested (for example, if I request 1080p60FPS I get 1080p30FPS). I tried to fix this in the second method by searching for the best video for all qualities and framerates that are equal to or lower than the one I picked (for example, if I pick 1080p60FPS it would look for videos from 1080p60->1080p30->720p60->720p30->...->144p30).

  The second method however looks overly convoluted and stupid and another problem still remains. youtube-dl always picks the best audio quality no matter what video quality I choose. I want the audio quality to scale with the video quality (for example, if I pick 144p I want poor audio quality). There has got to be a better way.

  Maybe I am explaining this poorly but I basically want youtube-dl to ALWAYS (consistently) download the exact same video and audio format as the one that is displayed in the youtube video player itself for each picked video quality (see image below). How do I do that ?

  Example 1, Video and audio format codes of video in 4K (the numbers in the red circles are the format codes) :
  

  Example 2, Video and audio format of same video but this time in 720p :
  

  (should also pick a lower framerate video of same quality if that framerate is not available in the YouTube quality selector, for example 1080p30FPS in a 1080p60FPS video)

  Thanks !