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Thread: Poor performance transcoding DTS?

  1. #1
    Join Date
    Mar 2012
    Posts
    117

    Default Poor performance transcoding DTS?

    I generally get about 450fps when transcoding, but anything with DTS seems to transcode at around 80fps. Iím using directx/NVENC, any ideas?

  2. #2
    Join Date
    Sep 2009
    Posts
    2,457

    Default

    Mezzmo does not remux or transcode to DTS, so any file with DTS that is transcoded will generally go to AC3 audio. Can you please post the ffmpeg information of the file by right-clicking on the file in Mezzmo and select Get FFmpeg information and let us know the profile you are using in Mezzmo for the device. The files with DTS may be doing a full transcode which is slow where files with other formats are being remuxed (copied) which is much faster.

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  3. #3
    Join Date
    Mar 2012
    Posts
    117

    Default

    This is from DTS to what seems to be PCM stereo (AC3 would be fine). This sort of dovetails with my other post regarding Roku.

    I'm using a lightly hacked Roku 4k prf. I just removed the dts format:
    <format id="dts">
    </format>

    Here's why...

    I have a Roku in my room. This Roku is a 4k Ultra (latest) connected to a 2-channel amplifier that does not decode either AC3 or DTS (et al). The Roku (as far as I can tell) will downmix AC3, but only does DTS passthru. At least, if it is AC3, it plays fine, if it is DTS, I get no sound. Once I removed the container for DTS as above, I could play a movie, but I get a lot of buffering and it *seems* to transcode DTS to stereo, but I can't be certain, as the device is stereo, so even if it were coverting it to AC3 I wouldn't know with this device (the Roku itself is set to output PCM stereo only).

    I get that I am on the fringes of supportability here, but it seems like a viable scenario folks could run into (DTS sound with a Roku connected to a stereo amplifier). Here is the ffmpeg output:

    ffmpeg version git-2020-06-28-4cfcfb3 Copyright (c) 2000-2020 the FFmpeg developers
    built with gcc 9.3.1 (GCC) 20200621
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
    libavutil 56. 55.100 / 56. 55.100
    libavcodec 58. 93.100 / 58. 93.100
    libavformat 58. 47.100 / 58. 47.100
    libavdevice 58. 11.100 / 58. 11.100
    libavfilter 7. 86.100 / 7. 86.100
    libswscale 5. 8.100 / 5. 8.100
    libswresample 3. 8.100 / 3. 8.100
    libpostproc 55. 8.100 / 55. 8.100
    [matroska,webm @ 000001ab4f64bb00] Could not find codec parameters for stream 4 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
    Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
    [matroska,webm @ 000001ab4f64bb00] Could not find codec parameters for stream 5 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
    Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
    Input #0, matroska,webm, from 'D:\Movies\Black Panther\Black Panther.mkv':
    Metadata:
    title : Black Panther
    encoder : libebml v1.4.1 + libmatroska v1.6.2
    creation_time : 2021-02-22T16:54:49.000000Z
    Duration: 02:14:33.15, start: 0.000000, bitrate: 31614 kb/s
    Chapter #0:0: start 0.000000, end 416.290875
    Metadata:
    title : Chapter 01
    Chapter #0:1: start 416.290875, end 722.805417
    Metadata:
    title : Chapter 02
    Chapter #0:2: start 722.805417, end 1152.359542
    Metadata:
    title : Chapter 03
    Chapter #0:3: start 1152.359542, end 1712.961250
    Metadata:
    title : Chapter 04
    Chapter #0:4: start 1712.961250, end 1991.698042
    Metadata:
    title : Chapter 05
    Chapter #0:5: start 1991.698042, end 2457.496708
    Metadata:
    title : Chapter 06
    Chapter #0:6: start 2457.496708, end 2914.036125
    Metadata:
    title : Chapter 07
    Chapter #0:7: start 2914.036125, end 3226.097875
    Metadata:
    title : Chapter 08
    Chapter #0:8: start 3226.097875, end 3717.338625
    Metadata:
    title : Chapter 09
    Chapter #0:9: start 3717.338625, end 4113.025583
    Metadata:
    title : Chapter 10
    Chapter #0:10: start 4113.025583, end 4606.768833
    Metadata:
    title : Chapter 11
    Chapter #0:11: start 4606.768833, end 4944.022417
    Metadata:
    title : Chapter 12
    Chapter #0:12: start 4944.022417, end 5481.434292
    Metadata:
    title : Chapter 13
    Chapter #0:13: start 5481.434292, end 6075.360958
    Metadata:
    title : Chapter 14
    Chapter #0:14: start 6075.360958, end 6656.483167
    Metadata:
    title : Chapter 15
    Chapter #0:15: start 6656.483167, end 7156.941458
    Metadata:
    title : Chapter 16
    Chapter #0:16: start 7156.941458, end 7363.898208
    Metadata:
    title : Chapter 17
    Chapter #0:17: start 7363.898208, end 8073.148417
    Metadata:
    title : Chapter 18
    Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc
    Metadata:
    BPS-eng : 23599557
    DURATION-eng : 02:14:33.149000000
    NUMBER_OF_FRAMES-eng: 193562
    NUMBER_OF_BYTES-eng: 23815342771
    _STATISTICS_WRITING_APP-eng: mkvmerge v53.0.0 ('Fool's Gold') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2021-02-22 16:54:49
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(eng): Audio: dts (DTS-HD MA), 48000 Hz, 7.1, s32p (24 bit) (default)
    Metadata:
    title : Surround 7.1
    BPS-eng : 4980859
    DURATION-eng : 02:14:33.152000000
    NUMBER_OF_FRAMES-eng: 756858
    NUMBER_OF_BYTES-eng: 5026404652
    _STATISTICS_WRITING_APP-eng: mkvmerge v53.0.0 ('Fool's Gold') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2021-02-22 16:54:49
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s
    Metadata:
    title : Surround 5.1
    BPS-eng : 1509000
    DURATION-eng : 02:14:33.152000000
    NUMBER_OF_FRAMES-eng: 756858
    NUMBER_OF_BYTES-eng: 1522798296
    _STATISTICS_WRITING_APP-eng: mkvmerge v53.0.0 ('Fool's Gold') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2021-02-22 16:54:49
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:3(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s
    Metadata:
    title : Surround 5.1
    BPS-eng : 1509000
    DURATION-eng : 02:14:33.152000000
    NUMBER_OF_FRAMES-eng: 756858
    NUMBER_OF_BYTES-eng: 1522798296
    _STATISTICS_WRITING_APP-eng: mkvmerge v53.0.0 ('Fool's Gold') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2021-02-22 16:54:49
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:4(eng): Subtitle: hdmv_pgs_subtitle
    Metadata:
    title : English
    BPS-eng : 32556
    DURATION-eng : 02:14:07.957000000
    NUMBER_OF_FRAMES-eng: 3670
    NUMBER_OF_BYTES-eng: 32751431
    _STATISTICS_WRITING_APP-eng: mkvmerge v53.0.0 ('Fool's Gold') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2021-02-22 16:54:49
    _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:5(eng): Subtitle: hdmv_pgs_subtitle (default) (forced)
    Metadata:
    title : Forced Sub
    BPS-eng : 838
    DURATION-eng : 02:10:25.192000000
    NUMBER_OF_FRAMES-eng: 136
    NUMBER_OF_BYTES-eng: 820331
    _STATISTICS_WRITING_APP-eng: mkvmerge v53.0.0 ('Fool's Gold') 64-bit
    _STATISTICS_WRITING_DATE_UTC-eng: 2021-02-22 16:54:49
    _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: 41, 100
    ---> Frame rate: 23.98
    ---> Aspect ratio: 16:9 PAR=1:1
    ---> Duration: 02:14:33

  4. #4
    Join Date
    Sep 2009
    Posts
    2,457

    Default

    matroska is set to pretranscodeonly="1", so when playing a file that transcodes on the fly it will go to hls. You can try removing pretranscodeonly="1" and this will allow it to remux the video which should be much faster but you will not be able to fast forward

    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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