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FFMPEG re-encoding first frame issue

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May 26th, 2015
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  1. /usr/local/bin/ffmpeg -threads 0 -r 23.976 -i "original.mp4" -c:v libx264 -profile:v high -level 4.1 -b:v 1500k -minrate 1200k -maxrate 2200k -bufsize 1200k -preset fast -pix_fmt yuv420p -g 23.976 -an -y "re-encoded.mp4"
  2.  
  3.  
  4. # First couple frames from original.mp4
  5. {
  6.     "frames": [
  7.         { "media_type": "video", "key_frame": 1, "pkt_pts": 1001, "pkt_pts_time": "0.041708", "pkt_dts": 1001, "pkt_dts_time": "0.041708", "best_effort_timestamp": 1001, "best_effort_timestamp_time": "0.041708", "pkt_duration": 1001, "pkt_duration_time": "0.041708", "pkt_pos": "24947", "pkt_size": "24269", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "I", "coded_picture_number": 0, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  8.         { "media_type": "video", "key_frame": 0, "pkt_pts": 2002, "pkt_pts_time": "0.083417", "pkt_dts": 2002, "pkt_dts_time": "0.083417", "best_effort_timestamp": 2002, "best_effort_timestamp_time": "0.083417", "pkt_duration": 1001, "pkt_duration_time": "0.041708", "pkt_pos": "68398", "pkt_size": "5558", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "B", "coded_picture_number": 2, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  9.         { "media_type": "video", "key_frame": 0, "pkt_pts": 3003, "pkt_pts_time": "0.125125", "pkt_dts": 3003, "pkt_dts_time": "0.125125", "best_effort_timestamp": 3003, "best_effort_timestamp_time": "0.125125", "pkt_duration": 1001, "pkt_duration_time": "0.041708", "pkt_pos": "73956", "pkt_size": "5619", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "B", "coded_picture_number": 3, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  10.         { "media_type": "video", "key_frame": 0, "pkt_pts": 4004, "pkt_pts_time": "0.166833", "pkt_dts": 4004, "pkt_dts_time": "0.166833", "best_effort_timestamp": 4004, "best_effort_timestamp_time": "0.166833", "pkt_duration": 1001, "pkt_duration_time": "0.041708", "pkt_pos": "49216", "pkt_size": "19182", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "P", "coded_picture_number": 1, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  11.         { "media_type": "video", "key_frame": 1, "pkt_pts": 5005, "pkt_pts_time": "0.208542", "pkt_dts": 5005, "pkt_dts_time": "0.208542", "best_effort_timestamp": 5005, "best_effort_timestamp_time": "0.208542", "pkt_duration": 1001, "pkt_duration_time": "0.041708", "pkt_pos": "79575", "pkt_size": "27684", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "I", "coded_picture_number": 4, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  12.         { "media_type": "video", "key_frame": 0, "pkt_pts": 6006, "pkt_pts_time": "0.250250", "pkt_dts": 6006, "pkt_dts_time": "0.250250", "best_effort_timestamp": 6006, "best_effort_timestamp_time": "0.250250", "pkt_duration": 1001, "pkt_duration_time": "0.041708", "pkt_pos": "129927", "pkt_size": "5480", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "B", "coded_picture_number": 6, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 }
  13.  
  14. # First couple frames from re-encoded.mp4
  15. {
  16.     "frames": [
  17.         { "media_type": "video", "key_frame": 1, "pkt_pts": 0, "pkt_pts_time": "0.000000", "pkt_dts": 0, "pkt_dts_time": "0.000000", "best_effort_timestamp": 0, "best_effort_timestamp_time": "0.000000", "pkt_duration": 500, "pkt_duration_time": "0.041708", "pkt_pos": "48", "pkt_size": "16256", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "I", "coded_picture_number": 0, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  18.         { "media_type": "video", "key_frame": 0, "pkt_pts": 500, "pkt_pts_time": "0.041708", "pkt_dts": 500, "pkt_dts_time": "0.041708", "best_effort_timestamp": 500, "best_effort_timestamp_time": "0.041708", "pkt_duration": 500, "pkt_duration_time": "0.041708", "pkt_pos": "23144", "pkt_size": "2121", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "B", "coded_picture_number": 3, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  19.         { "media_type": "video", "key_frame": 0, "pkt_pts": 1000, "pkt_pts_time": "0.083417", "pkt_dts": 1000, "pkt_dts_time": "0.083417", "best_effort_timestamp": 1000, "best_effort_timestamp_time": "0.083417", "pkt_duration": 500, "pkt_duration_time": "0.041708", "pkt_pos": "20685", "pkt_size": "2459", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "B", "coded_picture_number": 2, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  20.         { "media_type": "video", "key_frame": 0, "pkt_pts": 1500, "pkt_pts_time": "0.125125", "pkt_dts": 1500, "pkt_dts_time": "0.125125", "best_effort_timestamp": 1500, "best_effort_timestamp_time": "0.125125", "pkt_duration": 500, "pkt_duration_time": "0.041708", "pkt_pos": "16304", "pkt_size": "4381", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "P", "coded_picture_number": 1, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  21.         { "media_type": "video", "key_frame": 1, "pkt_pts": 2000, "pkt_pts_time": "0.166834", "pkt_dts": 2000, "pkt_dts_time": "0.166834", "best_effort_timestamp": 2000, "best_effort_timestamp_time": "0.166834", "pkt_duration": 500, "pkt_duration_time": "0.041708", "pkt_pos": "25265", "pkt_size": "16716", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "I", "coded_picture_number": 4, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 },
  22.         { "media_type": "video", "key_frame": 0, "pkt_pts": 2500, "pkt_pts_time": "0.208542", "pkt_dts": 2500, "pkt_dts_time": "0.208542", "best_effort_timestamp": 2500, "best_effort_timestamp_time": "0.208542", "pkt_duration": 500, "pkt_duration_time": "0.041708", "pkt_pos": "46629", "pkt_size": "2306", "width": 1280, "height": 720, "pix_fmt": "yuv420p", "sample_aspect_ratio": "1:1", "pict_type": "B", "coded_picture_number": 6, "display_picture_number": 0, "interlaced_frame": 0, "top_field_first": 0, "repeat_pict": 0 }
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