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Thread: HLS (chromecast, roku), and burned subtitles issue

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  1. #1
    Join Date
    Feb 2017
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    Default HLS (chromecast, roku), and burned subtitles issue

    I think I found a bug with the HLS format and using Burn Subtitles into video, I don't have these devices but I do have a hdmi dongle that works good with the HLS format it allows me to free seek without full encoding the file, however it seems to have an issue with Burned subtitles, when I seek to a position in the movie the subtitles get 'reset' to the beginning and no longer sync with the movie, (ie seek to 30 minutes into the movie, the burned subtitle will reset to first lines.)

    The expected behavior would be, is when you seek it should encode the correct position of the subtitle with that timeline in the movie.

    I hope this makes sense, and is fixable

    Thanks
    Last edited by odin; 11-17-2020 at 06:59 AM.

  2. #2
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    I tried it here with a DVD which had bitmap subtitles which Mezzmo burned in and after seeking to 30 minutes in the subtitles were shown correctly for the time. What format of file are you playing and are the subtitles embedded or external?

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
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  3. #3
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    Quote Originally Posted by Peter View Post
    I tried it here with a DVD which had bitmap subtitles which Mezzmo burned in and after seeking to 30 minutes in the subtitles were shown correctly for the time. What format of file are you playing and are the subtitles embedded or external?
    Most of my subtitles are in external srt format, some movies use embedded (although I could never get embedded to work with sub burning so I use mezzmo to extract any embedded subs to srt first), so I guess external srt would be the best answer for that, then I use the chromecast profile which encoded them to hls format and enable sub-burning since my device doesn't support any containers for subs, on your end can you test with srt subtitles and see what happens? maybe dvd or image subtitles are working.

    I have tried several different movies and the result is the same.

    here you can see part 262 (which I seeked to on hdmi device is showing the opening subtitle text, I just used the pc to directly play the transcoded file for a better example.)
    Capturess.JPG

    I am wondering if maybe it's related to the nvenc hardware encoding, I will try turning hardware encoding off later and see what happens.

    Movie format (before hls transcode)
    ffmpeg version N-90389-g247cdc2 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 4.9.2 (GCC)
    configuration: --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/home/peter/ffmpeg/build/gpl64 --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread -lstdc++' --enable-runtime-cpudetect --extra-cflags=-I/home/peter/cc32/include --extra-ldflags=-L/home/peter/cc64/lib --pkg-config=pkg-config --pkg-config-flags=--static --disable-w32threads --enable-libvpx --enable-libvorbis --enable-libtheora --enable-libx265 --enable-cuda --enable-cuvid --enable-dxva2 --enable-libmfx --enable-nvenc --enable-gnutls --extra-libs='-lz -lnettle -lhogweed -lgmp -lidn -lws2_32 -lcrypt32'
    libavutil 56. 11.100 / 56. 11.100
    libavcodec 58. 14.100 / 58. 14.100
    libavformat 58. 10.100 / 58. 10.100
    libavdevice 58. 2.100 / 58. 2.100
    libavfilter 7. 13.100 / 7. 13.100
    libswscale 5. 0.102 / 5. 0.102
    libswresample 3. 0.101 / 3. 0.101
    Input #0, matroska,webm, from 'z:\Movies\2020.1080p.mkv':
    Metadata:
    title : test
    encoder : libebml v1.3.9 + libmatroska v1.5.2
    creation_time : 2020-10-06T04:18:47.000000Z
    Duration: 01:27:02.56, start: 0.000000, bitrate: 4946 kb/s
    Chapter #0:0: start 0.000000, end 874.124000
    Metadata:
    title : 1
    Chapter #0:1: start 874.124000, end 1786.494000
    Metadata:
    title : 2
    Chapter #0:2: start 1786.494000, end 2624.247000
    Metadata:
    title : 3
    Chapter #0:3: start 2624.247000, end 3424.005000
    Metadata:
    title : 4
    Chapter #0:4: start 3424.005000, end 4351.806000
    Metadata:
    title : 5
    Chapter #0:5: start 4351.806000, end 4901.062000
    Metadata:
    title : 6
    Chapter #0:6: start 4901.062000, end 5222.560000
    Metadata:
    title : 7
    Stream #0:0(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    Metadata:
    BPS-eng : 384000
    DURATION-eng : 01:27:02.560000000
    NUMBER_OF_FRAMES-eng: 163205
    NUMBER_OF_BYTES-eng: 250682880
    _STATISTICS_WRITING_APP-eng: mkvmerge v35.0.0 ('All The Love In The World') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2020-10-06 04:18:47
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x800 [SAR 1:1 DAR 12:5], 23.98 fps, 23.98 tbr, 1k tbn, 2k tbc (default)
    Metadata:
    BPS-eng : 4560470
    DURATION-eng : 01:27:02.514000000
    NUMBER_OF_FRAMES-eng: 125215
    NUMBER_OF_BYTES-eng: 2977140010
    _STATISTICS_WRITING_APP-eng: mkvmerge v35.0.0 ('All The Love In The World') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2020-10-06 04:18:47
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    At least one output file must be specified

    <MEZZMO>: Child process ended with code: 109, ExitCode=1


    ---> DB Level Info: 40, 100
    ---> Frame rate: 23.98
    ---> Aspect ratio: 12:5 PAR=1:1
    ---> Duration: 01:27:02
    Last edited by odin; 11-17-2020 at 12:17 PM.

  4. #4
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    I have reproduced the issue with the external subtitles, we are working on a solution to the problem now

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
    Mezzmo for Kodi Add-on: Install it into Kodi to stream files from your Mezzmo library directly in Kodi. Full details at http://www.mezzmo.com/wiki/doku.php?...odi_user_guide
    Mezzmo for Roku App: Install it onto your Roku to stream files from your Mezzmo library. Full details at http://www.mezzmo.com/wiki/doku.php?...oku_user_guide
    Wiki: User Guides & Reference Manual at http://www.mezzmo.com/wiki
    Facebook: http://www.facebook.com/Mezzmo.DLNA.Server
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  5. #5
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    Quote Originally Posted by Peter View Post
    I have reproduced the issue with the external subtitles, we are working on a solution to the problem now
    Excellent, hopefully it's an easy fix

  6. #6
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    We have made a change that is showing the subtitles correctly. Please send an email to support [at] conceiva [dot] com and we will send you a patch to try.

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
    Mezzmo for Kodi Add-on: Install it into Kodi to stream files from your Mezzmo library directly in Kodi. Full details at http://www.mezzmo.com/wiki/doku.php?...odi_user_guide
    Mezzmo for Roku App: Install it onto your Roku to stream files from your Mezzmo library. Full details at http://www.mezzmo.com/wiki/doku.php?...oku_user_guide
    Wiki: User Guides & Reference Manual at http://www.mezzmo.com/wiki
    Facebook: http://www.facebook.com/Mezzmo.DLNA.Server
    Twitter: https://twitter.com/conceiva_mezzmo
    Web: http://www.mezzmo.com

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