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  • How to correctly calculate which segments are ready to be downloaded using MPEG-DASH

    24 avril 2019, par igal k

    What i’m trying to do ?

    Write a simple MPEG-DASH client using the SegmentTemplate pattern to calculate which segments are ready to be downloaded for a live source.

    A picture taken using chrome’s debugging tools at a moment X showing an mpd request(8af651fd747.....mpd) and the actual segments fetched respectfully to that request.

    enter image description here

    Given the following MPD

    <mpd availabilitystarttime="2019-04-24T06:43:32Z" maxsegmentduration="PT4.096S" minbuffertime="PT4.096S" minimumupdateperiod="PT15.835S" profiles="urn:mpeg:dash:profile:isoff-live:2011" publishtime="2019-04-24T11:14:01Z" suggestedpresentationdelay="PT11.878S" timeshiftbufferdepth="PT65.536S" type="dynamic" xmlns="urn:mpeg:dash:schema:mpd:2011">
    
  <location>https://content-aaps1.uplynk.com/channel/8af651fd7473474f86a05ffb0a1c8972.mpd?rmt=wv&amp;amp;cid=8af651fd7473474f86a05ffb0a1c8972&amp;amp;oid=600e5c27541344a1bf3818617ad712ce&amp;amp;prettydash=1&amp;amp;exp=1556091088&amp;amp;rn=4138683939&amp;amp;tc=1&amp;amp;ct=c&amp;amp;sig=5fb7f0c18f3f1d2ad4fdee53c02c1e1ed904bc5e8474f4ebf886d209ff7f21c9&amp;amp;pbs=05b6594bcf4b4728ac1094976a80194d</location>
    
  <period start="PT2826.240S">
    
    <adaptationset maxframerate="30" maxheight="720" maxwidth="1280" mimetype="video/mp4" segmentalignment="true" startwithsap="1">
    
      <representation bandwidth="2604473" codecs="avc1.64001e" framerate="30" height="360" scantype="progressive" width="640">
    
        <baseurl>https://x-default-stgec.uplynk.com/aapm/slices/8c1/600e5c27541344a1bf3818617ad712ce/8c1027496a964b049f1bd5895f8f0412/</baseurl>
    
        <segmenttemplate duration="368640" initialization="https://x-default-stgec.uplynk.com/aapm/slices/8c1/600e5c27541344a1bf3818617ad712ce/8c1027496a964b049f1bd5895f8f0412/$RepresentationID$_init.mp4?pbs=05b6594bcf4b4728ac1094976a80194d&amp;amp;_jt=l&amp;amp;chid=8af651fd7473474f86a05ffb0a1c8972" media="$RepresentationID$$Number%08d$.m4f?pbs=05b6594bcf4b4728ac1094976a80194d&amp;amp;_jt=l&amp;amp;chid=8af651fd7473474f86a05ffb0a1c8972" presentationtimeoffset="254361599" startnumber="690" timescale="90000"></segmenttemplate>
    
      </representation>
    
    </adaptationset>
    
  </period>
    
  <utctiming schemeiduri="urn:mpeg:dash:utc:http-iso:2014" value="https://content-aaps1.uplynk.com/misc/utcservertime"></utctiming>
    
</mpd>

    I see that the next segment request should be #3955

    What i have tried so far

        period.end = 1556104456;
    
    period.start = 2826;
    
    availability_start_time = 1556088212;
    
    max_segment_duration = 4;
    
    time_shift_buffer_depth = 65

    So, first of all, i read DASH-IF-IOP 4.3 section 4.3.4.2 page #82 and implemented the following code :

       int k1 = 1;
    
int period_duration = period.end - (period.start + data_.availability_start_time);
    
int k2 = ceil((float)period_duration / (float)data_.max_segment_duration);
    
double duration = ((float)representation.duration / (float)representation.timeScale);
    
size_t live_edge = std::min(
    
    (int)floor((float)((data_.publish_time - data_.availability_start_time - period.start) / duration)), k2);
    

    
size_t oldest = std::max(k1, (int)floor((float)((data_.publish_time - data_.availability_start_time - period.start -
    
                                                    data_.time_shift_buffer_depth) /
    
                                                duration)));

    after calculating everything : k1=1, k2=3355, live_edge=3272 and oldest=3256

    Also tried using ffmpeg’s dashdec.c

    for min_segment :

    if (c->is_live &amp;&amp; pls->fragment_duration)
    
    {
    
        num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration;
    
    }

    for max_segment :

    num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration;

    after a small modification :

    size_t pmax = (((data_.publish_time - data_.availability_start_time))) / duration;
    
size_t pmin = ((data_.publish_time - data_.availability_start_time) - data_.time_shift_buffer_depth) / duration;

    pmin=3946 pmax=3961

    in the ffmpeg example, i had to manually remove the first_seq_no variable because it looked like i doubled added the SegmentTemplate@StartNumber.

    even after succeeding in this task, how do i exactly build the request list of Segment(NOW) ----> Segment(LIVE_EDGE)

  • batch i need to encode hole folder files

    4 mai 2019, par jonedave

    I need one batch code for ffmpeg which can encode & zoom resolution of all videos inside folder to 110% & 125% of original using batch code.

    Here are some codes which I test not working :

    for %%a in ("*.*") do ffmpeg -i "%%a"  -vf scale=2*iw:-1, crop=iw/2:ih/2" "newfiles\%%~na.mp4"
    
pause
    for %%a in ("*.*") do ffmpeg -i "%%a" -vf "zoompan=z='1+(1.4*in/300)':x='70*in/300':y='190*in/300':d=1"  "newfiles\%%~na.mp4"
    
for %%a in ("*.*") do ffmpeg -i "%%a" -vf "zoompan=z='1+(1.4*in/300"  "newfiles\%%~na.mp4"
    
pause

    error i getting

    C:\down\Compressed\DRIVER PACK FOR MOBILE PHONE\DRIVER PACK FOR MOBILE PHONE>ffm
    
peg -i "avutil-ics-56.dll" -vf "zoompan=z='1+(1.4*in/300"  "newfiles\avutil-ics-
    
56.mp4"
    
ffmpeg version N-93461-g6e42021128 Copyright (c) 2000-2019 the FFmpeg developers
    

    
  built with gcc 8.2.1 (GCC) 20190212
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfi
    
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libb
    
luray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enab
    
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --e
    
nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable
    
-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 -
    
-enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enab
    
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --en
    
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --en
    
able-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --e
    
nable-dxva2 --enable-avisynth --enable-libopenmpt
    
  libavutil      56. 26.100 / 56. 26.100
    
  libavcodec     58. 47.105 / 58. 47.105
    
  libavformat    58. 26.101 / 58. 26.101
    
  libavdevice    58.  7.100 / 58.  7.100
    
  libavfilter     7. 48.100 /  7. 48.100
    
  libswscale      5.  4.100 /  5.  4.100
    
  libswresample   3.  4.100 /  3.  4.100
    
  libpostproc    55.  4.100 / 55.  4.100
    
avutil-ics-56.dll: Invalid data found when processing input
    

    
C:\down\Compressed\DRIVER PACK FOR MOBILE PHONE\DRIVER PACK FOR MOBILE PHONE>ffm
    
peg -i "ffmpeg.exe" -vf "zoompan=z='1+(1.4*in/300"  "newfiles\ffmpeg.mp4"
    
ffmpeg version N-93461-g6e42021128 Copyright (c) 2000-2019 the FFmpeg developers
    

    
  built with gcc 8.2.1 (GCC) 20190212
    
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfi
    
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libb
    
luray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enab
    
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --e
    
nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable
    
-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 -
    
-enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enab
    
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --en
    
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --en
    
able-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --e
    
nable-dxva2 --enable-avisynth --enable-libopenmpt
    
  libavutil      56. 26.100 / 56. 26.100
    
  libavcodec     58. 47.105 / 58. 47.105
    
  libavformat    58. 26.101 / 58. 26.101
    
  libavdevice    58.  7.100 / 58.  7.100
    
  libavfilter     7. 48.100 /  7. 48.100
    
  libswscale      5.  4.100 /  5.  4.100
    
  libswresample   3.  4.100 /  3.  4.100
    
  libpostproc    55.  4.100 / 55.  4.100
    
ffmpeg.exe: Invalid data found when processing input

  • Can ffmpeg copy metadata/ID3 from FLAC to MP3 ?

    9 avril 2019, par krypterro

    I have a bit of Python code that loops through audio files, finds .FLAC files, and then uses the Python subcommand to run ffmpeg. It works. The audio is fine, but even though I see the metadata in the shell, it doesn’t transfer the data to the ID3 tags in the MP3, and I am using the example found in the previous post here. Here’s the command :

    cmd = 'ffmpeg -y -i "' + src + '" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "' + dst + '"'

    Which works out to :

    ffmpeg -y -i "source.flac" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "destination.mp3"

    And here is the log dump :

    /usr/local/bin/python3.7 /home/krypterro/PycharmProjects/mediaman/RipFLAC.py
    
1 Music Files Found
    
2019-04-09 14:32:47.758 | INFO     | __main__:main:31 - Start of program
    
2019-04-09 14:32:48.110 | DEBUG    | __main__:ripmp3:206 - Running Command: ffmpeg -y -i "/home/krypterro/audio/music_in/Visions/01-grimes-laughing_and_not_being_normal.flac" -acodec libmp3lame -ab 192000 "/home/krypterro/audio/music_out/Visions/01-grimes-laughing_and_not_being_normal.mp3"
    
ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
    
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
    
  WARNING: library configuration mismatch
    
  avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
    
  libavutil      55. 78.100 / 55. 78.100
    
  libavcodec     57.107.100 / 57.107.100
    
  libavformat    57. 83.100 / 57. 83.100
    
  libavdevice    57. 10.100 / 57. 10.100
    
  libavfilter     6.107.100 /  6.107.100
    
  libavresample   3.  7.  0 /  3.  7.  0
    
  libswscale      4.  8.100 /  4.  8.100
    
  libswresample   2.  9.100 /  2.  9.100
    
  libpostproc    54.  7.100 / 54.  7.100
    
Input #0, flac, from '/home/krypterro/audio/music_in/Visions/01-grimes-laughing_and_not_being_normal.flac':
    
  Metadata:
    
    ARTIST          : Grimes
    
    TITLE           : Laughing And Not Being Normal
    
    ALBUM           : Art Angels
    
    DATE            : 2015
    
    track           : 1
    
    GENRE           : Electronic
    
    disc            : 1
    
    TOTALDISCS      : 1
    
    TOTALTRACKS     : 15
    
    LANGUAGE        : English
    
    RIP DATE        : 2015-12-12
    
    RETAIL DATE     : 2015-00-00
    
    MEDIA           : CD
    
    ENCODER         : FLAC 1.2.1 -8 -V
    
    RIPPING TOOL    : EAC 1.0 Beta 3
    
    RELEASE TYPE    : Retail
    
    ORGANIZATION    : 4AD
    
    CATALOG         : CAD3535CD
    
  Duration: 00:01:47.51, start: 0.000000, bitrate: 743 kb/s
    
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (flac (native) -> mp3 (libmp3lame))
    
Press [q] to stop, [?] for help
    
Output #0, mp3, to '/home/krypterro/audio/music_out/Visions/01-grimes-laughing_and_not_being_normal.mp3':
    
  Metadata:
    
    TPE1            : Grimes
    
    TIT2            : Laughing And Not Being Normal
    
    TALB            : Art Angels
    
    TDRC            : 2015
    
    TRCK            : 1
    
    TCON            : Electronic
    
    TPOS            : 1
    
    TOTALDISCS      : 1
    
    TOTALTRACKS     : 15
    
    TLAN            : English
    
    RIP DATE        : 2015-12-12
    
    RETAIL DATE     : 2015-00-00
    
    MEDIA           : CD
    
    CATALOG         : CAD3535CD
    
    RIPPING TOOL    : EAC 1.0 Beta 3
    
    RELEASE TYPE    : Retail
    
    ORGANIZATION    : 4AD
    
    TSSE            : Lavf57.83.100
    
    Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
    
    Metadata:
    
      encoder         : Lavc57.107.100 libmp3lame
    
size=    2522kB time=00:01:47.52 bitrate= 192.1kbits/s speed=  41x    
    
video:0kB audio:2521kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.042501%
    
2019-04-09 14:32:50.811 | INFO     | __main__:main:73 - End of program
    

    
Process finished with exit code 0

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