Few problems with Shotcut on Mint 20

Hello I am newbie to linux and Mint 20 Xfce. I installed Shotcut 20.02.21. First I wanted to open mlt file created in older version of Windows. I renamed source file path in the mlt file. I opened it and then very much messages been genarated. The video project seemed to be opened but I have 800x600 resolution of screen. So I see that I see not a lot of the Shotcut windows. So I tried to increase screen resolution and Shotcut crashed. It has small text and the window of Shotcut was just too wide. I could be with width=1024px, but this size was just too large for me and I say again, the text is too small for me. I just wanted to start making video on linux.

[Debug  ] <LeapNetworkListener::onDisconnected> Disconnected from Leap Motion 
[Debug  ] <LeapNetworkListener::onError> Leap Motion WebSocket error: "Connection refused [translated]" 
[Debug  ] <MainWindow::open> "/root/.local/share/Meltytech/Shotcut/__untitled__.mlt" 
[Debug  ] <MltXmlChecker::check> begin 
[Debug  ] <MltXmlChecker::check> end 
[Info   ] <MainWindow::open> decimal point '.' 
[Debug  ] <AudioLoudnessScopeWidget::resetQview> begin 
[Debug  ] <KeyframesDock::load> begin 
[Debug  ] <MainWindow::open> "/media/user/velke_zalohy_alfa/Dokumenty/oCam/eliastvi_lin.mlt" 
[Info   ] <MainWindow::showStatusMessage> "Otevírá se /media/user/velke_zalohy_alfa/Dokumenty/oCam/eliastvi_lin.mlt" 
No appenders associated with category qt.qpa.xcb
[Warning] <> QXcbConnection: XCB error: 3 (BadWindow), sequence: 1831, resource id: 8524071, major code: 40 (TranslateCoords), minor code: 0
[Debug  ] <MltXmlChecker::check> begin 
[Info   ] <MltXmlChecker::check> decimal point ',' 
[Debug  ] <MltXmlChecker::check> end 
[Info   ] <MainWindow::open> decimal point ',' 
[Error  ] <MLT> [producer_xml] failed to load transition "frei0r.cairoblend"
[Error  ] <MLT> [producer_xml] failed to load transition "frei0r.cairoblend"
[Debug  ] <Mlt::Controller::setPreviewScale> 744 x 592 
[Debug  ] <Mlt::Controller::setProjectFolder> project folder "" 
[Debug  ] <MainWindow::setAudioChannels> 2 
[Debug  ] <Mlt::Controller::setAudioChannels> 2 
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd77801a200] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778042300] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77801c840] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778044100] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd77802a1c0] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd778025d40] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd77802d080] Statistics: 283543 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77801c640] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778011340] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/TrackHead.qml:170:13: QML Button: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[h264 @ 0x7fd778096c40] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77805de80] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/TrackHead.qml:170:13: QML Button: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[h264 @ 0x7fd77810cc40] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd778018440] Statistics: 283543 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_20_48_44_390 OSHO.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd7780c7000] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/TrackHead.qml:170:13: QML Button: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[swscaler @ 0x7fd778343d00] Warning: data is not aligned! This can lead to a speed loss
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd78800a340] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd77805e4c0] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd77805d080] Statistics: 727124 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd75800ab00] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778041cc0] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd75802a3c0] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd7780153c0] Reinit context to 752x592, pix_fmt: yuv420p
[wav @ 0x7fd764008840] parser not found for codec pcm_s16le, packets or times may be invalid.
[h264 @ 0x7fd788010dc0] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778013a40] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd758055f40] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77803f1c0] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd758068840] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd778018440] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd778025000] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd778031980] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd758011c40] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd758068240] Statistics: 216914 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd788096cc0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[AVIOContext @ 0x7fd758021b40] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <AudioLevelsTask::run> generating audio levels for /media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4 audio track = 1 
[h264 @ 0x7fd7881fc000] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7780659c0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[wav @ 0x7fd76400b7c0] parser not found for codec pcm_s16le, packets or times may be invalid.
[h264 @ 0x7fd778049f80] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 0 total_channels 1 max_channels 1
[AVIOContext @ 0x7fd7640115c0] Statistics: 294956 bytes read, 2 seeks
[AVIOContext @ 0x7fd76400bdc0] Statistics: 294956 bytes read, 1 seeks
[Debug  ] <AudioLevelsTask::run> generating audio levels for /media/user/velke_zalohy_alfa/VIDEO - Reinkarnace a Eliášství v charismatickém hnutí,Curry Blake/reinkarnace_charismatice_02.wav audio track = 0 
[wav @ 0x7fd764038280] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd788011540] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd7880972c0] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd78800f580] Statistics: 283543 bytes read, 2 seeks
[Debug  ] <AudioLevelsTask::run> generating audio levels for /media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_20_48_44_390 OSHO.mp4 audio track = 1 
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd758028a00] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd75800c780] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd78802c740] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77805c500] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd788199440] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd7582ea040] Reinit context to 752x592, pix_fmt: yuv420p
[wav @ 0x7fd764038280] parser not found for codec pcm_s16le, packets or times may be invalid.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7780165c0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77800a080] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd78802fbc0] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7581c1080] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[AVIOContext @ 0x7fd778025000] Statistics: 216914 bytes read, 2 seeks
[h264 @ 0x7fd7580c8540] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd778049f80] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd758029a80] Statistics: 216914 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7883343c0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[wav @ 0x7fd76402e440] parser not found for codec pcm_s16le, packets or times may be invalid.
[h264 @ 0x7fd788095440] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd76403cd40] Statistics: 294956 bytes read, 2 seeks
[AVIOContext @ 0x7fd78800f580] Statistics: 283543 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_20_48_44_390 OSHO.mp4" checking VFR: pkt.duration 1024
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd778333b40] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd778046e00] Statistics: 350591 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd77801a7c0] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd77800c340] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778019d80] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7780197c0] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd778018440] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd778034700] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd778333b40] Statistics: 216914 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778048c40] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77802b600] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778465880] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778099740] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778466140] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd778018440] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd77802b600] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd778034700] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd77805d240] Statistics: 356777 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd778046a00] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778027600] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7780165c0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77814c000] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd778018440] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd778333b40] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd77804b7c0] Statistics: 283543 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77800b780] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778018880] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd7780659c0] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778325880] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77802e840] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd7780c89c0] Statistics: 283543 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_20_48_44_390 OSHO.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd778018880] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd778333b40] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd7780402c0] Statistics: 458335 bytes read, 3 seeks
[Debug  ] <TimelineDock::setSelection> Changing selection to ()  trackIndex -1 isMultitrack true 
[Debug  ] <VideoVectorScopeWidget::profileChanged> 601 
[Info   ] <MainWindow::open> "/media/user/velke_zalohy_alfa/Dokumenty/oCam/eliastvi_lin.mlt" 
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/Track.qml:85:13: Unable to assign [undefined] to double
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/Track.qml:84:13: Unable to assign [undefined] to QString
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd758020900] Statistics: 8410407 bytes read, 2 seeks
[AVIOContext @ 0x7fd75806a0c0] Statistics: 249682 bytes read, 2 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd778a9c340] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd77801a7c0] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/TrackHead.qml:170:13: QML Button: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778332900] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778046a00] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/TrackHead.qml:170:13: QML Button: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd778011340] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd778098f00] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd77804b7c0] Statistics: 283543 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77800b780] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778019600] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> file:///usr/share/shotcut/qml/views/timeline/TrackHead.qml:170:13: QML Button: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd7701b1c40] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd77803fc80] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77805c680] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778044280] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd77803f180] Statistics: 283543 bytes read, 2 seeks
[h264 @ 0x7fd7701b70c0] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_20_48_44_390 OSHO.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd778044f00] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7701fe280] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd770211c40] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[Debug  ] <AudioLevelsTask::run> generating audio levels for /media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4 audio track = 1 
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd77801d940] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd77804b7c0] Statistics: 458335 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7701f0e80] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7701f4280] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778035540] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd7780659c0] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd7701e95c0] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7780185c0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7783dd480] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77023ea40] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7701cdd00] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd7701f18c0] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd778011340] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[AVIOContext @ 0x7fd778309d80] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd77804b7c0] Statistics: 216914 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77800b780] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77814c000] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778044f00] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778009d40] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7783c6c00] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd778027980] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd77814c000] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd77800a340] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd77803f200] Statistics: 350591 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd778035540] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778046a00] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd7780165c0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7783dd480] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd778011340] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd77802a5c0] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd77804b7c0] Statistics: 216914 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd77800b780] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd778a8fa00] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778027600] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778043f40] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd7783c6c00] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd778003a80] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd778ad5340] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd778015640] Statistics: 216914 bytes read, 2 seeks
[AVIOContext @ 0x7fd77804b7c0] Statistics: 356777 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[h264 @ 0x7fd778035540] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd77800c340] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778043500] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77803eec0] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd77804b7c0] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd778027600] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd778098f00] Statistics: 283543 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778004980] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77803eec0] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd778384b80] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd778033ac0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd77802b600] Reinit context to 752x592, pix_fmt: yuv420p
[AVIOContext @ 0x7fd778012200] Statistics: 283543 bytes read, 2 seeks
[Debug  ] <MLT> [producer avformat] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_20_48_44_390 OSHO.mp4" checking VFR: pkt.duration 1024
[h264 @ 0x7fd7780177c0] Reinit context to 752x592, pix_fmt: yuv420p
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd778043980] Statistics: 283543 bytes read, 2 seeks
[AVIOContext @ 0x7fd7780c6880] Statistics: 727124 bytes read, 3 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd78800a6c0] Statistics: 21992880 bytes read, 2 seeks
[AVIOContext @ 0x7fd788324600] Statistics: 316311 bytes read, 2 seeks
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd76000b240] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd76000ce40] Reinit context to 752x592, pix_fmt: yuv420p
[h264 @ 0x7fd760028800] Reinit context to 752x592, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fd76005edc0] Value 1,000000 for parameter 'seekable' out of range [-1 - 0]
[h264 @ 0x7fd760055880] Reinit context to 752x592, pix_fmt: yuv420p
[Debug  ] <MLT> [producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
[AVIOContext @ 0x7fd760014080] Statistics: 216914 bytes read, 2 seeks
[Debug  ] <MLT> [mlt_producer avformat-novalidate] "/media/user/velke_zalohy_alfa/Dokumenty/oCam/Record_2023_04_07_21_33_59_8M search CS.mp4" checking VFR: pkt.duration 1024
[Info   ] <MLT> [filter swresample] 2(stereo) f32le 44100Hz -> 2(stereo) f32le 48000Hz
[Info   ] <MLT> [consumer sdl2_audio] Audio Opened: driver=alsa channels=2 frequency=48000
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd7701c4040] Statistics: 8410407 bytes read, 2 seeks
[AVIOContext @ 0x7fd7701c5080] Statistics: 249682 bytes read, 2 seeks
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[AVIOContext @ 0x7fd76402bfc0] Statistics: 118521622 bytes read, 1 seeks
ALSA lib pcm.c:8526:(snd_pcm_recover) underrun occurred
[Debug  ] <MainWindow::closeEvent> begin 
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[Warning] <> QSqlDatabasePrivate::database: requested database does not belong to the calling thread.
[Debug  ] <Database::shutdown> database closed 
[Debug  ] <MainWindow::closeEvent> end

That is a very old version and a build not made by us.

I have 800x600 resolution of screen

You need to close some panels (View menu) that are open by default and drag some panels into overlapping tabs to work on a small screen like that. Each panel except the central video area is adjustable. Here is the smallest window possible (based on latest version on my system) with many panels placed in a single tab:

image

679x456

the text is too small

You can try using the QT_SCALE_FACTOR=2 environment variable, but you do realize that making the text bigger is going to make it much harder to fit UI elements into a small window for a very small screen size?

OK, thank you. But how to update? I just used apt install to install the shotcut. Maybe I should better used flatpak? Because I think they have upto date apps. But I was on their site https://www.flatpak.org/ and I dont see search box.

Yes, I advise using the flat pack, the shotcut version is 12/22/21. The version that is in the mint repository is very old. I don’t know if “linux mint 20” supports installing flat packages from its interface, but 21.1 does.

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