Video stutter with new QTav player

[muzena]

@wang-bin @maxrd2 Problem is detailed described at: https://invent.kde.org/multimedia/subtitlecomposer/-/issues/22

[duck7000]

@muzena,Thanks for opening this issue, jet i have another play issue with a mkv file. This file comes directly from bluray and will not play, it stutters once or twice and thats it, no sound either

Output from ffmpeg:

ffmpeg -i The.Notebook.2004.Blu-ray.mkv
ffmpeg version n4.2.3 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  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
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[matroska,webm @ 0x55ee19cf8240] Could not find codec parameters for stream 2 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, matroska,webm, from 'The.Notebook.2004.Blu-ray.mkv':
  Metadata:
    title           : The Notebook
    encoder         : libmakemkv v1.15.1 (1.3.5/1.4.7) x86_64-pc-linux-gnu
    creation_time   : 2020-06-13T20:56:55.000000Z
  Duration: 02:03:48.96, start: 0.000000, bitrate: 23666 kb/s
    Chapter #0:0: start 0.000000, end 197.447250
    Metadata:
      title           : Chapter 01
    Chapter #0:1: start 197.447250, end 308.641667
    Metadata:
      title           : Chapter 02
    Chapter #0:2: start 308.641667, end 640.848542
    Metadata:
      title           : Chapter 03
    Chapter #0:3: start 640.848542, end 1152.943458
    Metadata:
      title           : Chapter 04
    Chapter #0:4: start 1152.943458, end 1698.279917
    Metadata:
      title           : Chapter 05
    Chapter #0:5: start 1698.279917, end 2211.042167
    Metadata:
      title           : Chapter 06
    Chapter #0:6: start 2211.042167, end 2595.843250
    Metadata:
      title           : Chapter 07
    Chapter #0:7: start 2595.843250, end 3244.115875
    Metadata:
      title           : Chapter 08
    Chapter #0:8: start 3244.115875, end 3463.418292
    Metadata:
      title           : Chapter 09
    Chapter #0:9: start 3463.418292, end 3695.692000
    Metadata:
      title           : Chapter 10
    Chapter #0:10: start 3695.692000, end 3892.722167
    Metadata:
      title           : Chapter 11
    Chapter #0:11: start 3892.722167, end 4515.219042
    Metadata:
      title           : Chapter 12
    Chapter #0:12: start 4515.219042, end 4886.548333
    Metadata:
      title           : Chapter 13
    Chapter #0:13: start 4886.548333, end 5121.157708
    Metadata:
      title           : Chapter 14
    Chapter #0:14: start 5121.157708, end 5310.680375
    Metadata:
      title           : Chapter 15
    Chapter #0:15: start 5310.680375, end 5735.104375
    Metadata:
      title           : Chapter 16
    Chapter #0:16: start 5735.104375, end 6135.295833
    Metadata:
      title           : Chapter 17
    Chapter #0:17: start 6135.295833, end 6678.672000
    Metadata:
      title           : Chapter 18
    Chapter #0:18: start 6678.672000, end 7100.218125
    Metadata:
      title           : Chapter 19
    Chapter #0:19: start 7100.218125, end 7428.963208
    Metadata:
      title           : Chapter 20
    Stream #0:0(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p(bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
    Metadata:
      BPS-eng         : 22242473
      DURATION-eng    : 02:03:48.963208333
      NUMBER_OF_FRAMES-eng: 178117
      NUMBER_OF_BYTES-eng: 20654814178
      SOURCE_ID-eng   : 001011
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.15.1 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-06-13 20:56:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
    Stream #0:1(eng): Audio: truehd, 48000 Hz, 5.1(side), s32 (24 bit) (default)
    Metadata:
      title           : Surround 5.1
      BPS-eng         : 1378265
      DURATION-eng    : 02:03:48.963333333
      NUMBER_OF_FRAMES-eng: 8914756
      NUMBER_OF_BYTES-eng: 1279885332
      SOURCE_ID-eng   : 001101
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.15.1 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-06-13 20:56:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
    Stream #0:2(eng): Subtitle: hdmv_pgs_subtitle (default)
    Metadata:
      BPS-eng         : 33550
      DURATION-eng    : 02:00:47.135729166
      NUMBER_OF_FRAMES-eng: 3288
      NUMBER_OF_BYTES-eng: 30393383
      SOURCE_ID-eng   : 001200
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.15.1 linux(x64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-06-13 20:56:55
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
    Stream #0:3: Video: mjpeg (Baseline), yuvj444p(pc, bt470bg/unknown/unknown), 640x360 [SAR 72:72 DAR 16:9], 90k tbr, 90k tbn, 90k tbc (attached pic)
    Metadata:
      filename        : cover.jpg
      mimetype        : image/jpeg
At least one output file must be specified