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• muxing DVB subtitles into transport stream with ffmpeg

  28 novembre 2019, par user3439130

  So i have H264 video + AAC audio muxed inside transport stream (*.ts). To achive evenly spread PCR values i added muxrate tag to my command.

  ffmpeg -analyzeduration 20000000 -probesize 20M -loglevel verbose -i 1135084.m4v -i 1135084.m4a -c copy -muxrate 7982K -map 0:v:0 -map 1:a:0 -metadata:s:a:0 language=eng -metadata:s:a:0 tms_track_id=169451954 TEMP0.ts

  Since our client need DVB substitles we convert SRT to DVD with subtitle edit and then encode them to DVB with ffmpeg with this command :

  ffmpeg -analyzeduration 20000000 -probesize 20M -loglevel verbose -i TEMP0.ts -i out.da.idx -map 0 -c copy -muxrate 7992K -map 1:s -c:s:0 dvbsub -metadata:s:s:0 language=dan TEMP1.ts

  here is output from ffmpeg command :

  ffmpeg version git-2019-11-18-d831edc Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20191010
  
    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-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-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 36.100 / 56. 36.100
  
    libavcodec     58. 62.100 / 58. 62.100
  
    libavformat    58. 35.100 / 58. 35.100
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 66.100 /  7. 66.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  [h264 @ 000002bf7460d400] non-existing SPS 0 referenced in buffering period
  
  [h264 @ 000002bf7460d400] SPS unavailable in decode_picture_timing
  
  [h264 @ 000002bf7460d400] non-existing SPS 0 referenced in buffering period
  
  [h264 @ 000002bf7460d400] SPS unavailable in decode_picture_timing
  
  [h264 @ 000002bf7460d400] Reinit context to 1920x1088, pix_fmt: yuv420p
  
  [mpegts @ 000002bf7460ae00] max_analyze_duration 20000000 reached at 20000000 microseconds st:0
  
  [mpegts @ 000002bf7460ae00] start time for stream 2 is not set in estimate_timings_from_pts
  
  Input #0, mpegts, from 'TEMP1.ts':
  
    Duration: 01:51:54.48, start: 1.440000, bitrate: 7992 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (High), 1 reference frame ([27][0][0][0] / 0x001B), yuv420p(progressive, left), 1920x1080 (1920x1088) [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x101](eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 254 kb/s
  
      Stream #0:2[0x102](dan): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
  [vobsub @ 000002bf75d65940] IDX/SUB: out.fi.idx -> out.fi.sub
  
  Input #1, vobsub, from 'out.fi.idx':
  
    Duration: N/A, bitrate: N/A
  
      Stream #1:0[0x0](fi): Subtitle: dvd_subtitle, 1920x1080 (default)
  
  File 'TEMP2.ts' already exists. Overwrite? [y/N] y
  
  [mpegts @ 000002bf74634f00] service 1 using PCR in pid=256, pcr_period=20ms
  
  [mpegts @ 000002bf74634f00] muxrate 8002000, sdt every 500 ms, pat/pmt every 100 ms
  
  Output #0, mpegts, to 'TEMP2.ts':
  
    Metadata:
  
      encoder         : Lavf58.35.100
  
      Stream #0:0: Video: h264 (High), 1 reference frame ([27][0][0][0] / 0x001B), yuv420p(progressive, left), 1920x1080 (0x0) [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 25 tbr, 90k tbn, 90k tbc
  
      Stream #0:1(eng): Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 254 kb/s
  
      Stream #0:2(dan): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
      Stream #0:3(fin): Subtitle: dvb_subtitle (dvbsub), 1920x1080 (default)
  
      Metadata:
  
        encoder         : Lavc58.62.100 dvbsub
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #0:2 -> #0:2 (copy)
  
    Stream #1:0 -> #0:3 (dvd_subtitle (dvdsub) -> dvb_subtitle (dvbsub))
  
  Press [q] to stop, [?] for help
  
  No more output streams to write to, finishing.me=01:51:46.51 bitrate=7990.2kbits/s speed=18.2x
  
  frame=167862 fps=456 q=-1.0 Lsize= 6558750kB time=01:51:54.47 bitrate=8002.0kbits/s speed=18.2x
  
  video:5738580kB audio:212004kB subtitle:10989kB other streams:0kB global headers:0kB muxing overhead: 10.017118%
  
  Input file #0 (TEMP1.ts):
  
    Input stream #0:0 (video): 167862 packets read (5876305439 bytes);
  
    Input stream #0:1 (audio): 314742 packets read (217092443 bytes);
  
    Input stream #0:2 (subtitle): 1740 packets read (5578504 bytes);
  
    Total: 484344 packets (6098976386 bytes) demuxed
  
  Input file #1 (out.fi.idx):
  
    Input stream #1:0 (subtitle): 855 packets read (6881158 bytes); 854 frames decoded;
  
    Total: 855 packets (6881158 bytes) demuxed
  
  Output file #0 (TEMP2.ts):
  
    Output stream #0:0 (video): 167862 packets muxed (5876305439 bytes);
  
    Output stream #0:1 (audio): 314742 packets muxed (217092443 bytes);
  
    Output stream #0:2 (subtitle): 1740 packets muxed (5578504 bytes);
  
    Output stream #0:3 (subtitle): 1708 frames encoded; 1708 packets muxed (5673736 bytes);
  
    Total: 486052 packets (6104650122 bytes) muxed
  
  [AVIOContext @ 000002bf7463c280] Statistics: 0 seeks, 25621 writeouts
  
  [AVIOContext @ 000002bf74613f80] Statistics: 6728300448 bytes read, 2 seeks
  
  [AVIOContext @ 000002bf75efde40] Statistics: 7852032 bytes read, 0 seeks
  
  [AVIOContext @ 000002bf74f30e40] Statistics: 40275 bytes read, 0 seeks

  So i have video/audio and two dvb tracks inside one TS.

  Now im adding third subtitle and i get this warning :

  frame=32351 fps=869 q=-1.0 size= 1255936kB time=00:21:33.99 bitrate=7951.1kbits/s speed=34.8x
  
  [mpegts @ 0x2994600] Non-monotonous DTS in output stream 0:3; previous: 116868609, current: 116868607; changing to 116868610. This may result in incorrect timestamps in the output file.
  
  frame=33416 fps=886 q=-1.0 size= 1297408kB time=00:22:16.56 bitrate=7952.0kbits/s speed=35.4x

  By this warning it seems that something is not right with DVB (0:3) Finish track.
  Playing back the file with VLC i can see that Finish subtitles (between 21:33 and 22:16) are not showing up.

  Dumping packets from 0:3 track i see that 4 packets have the same DTS/PTS values.

  #stream#, dts,        pts, duration,     size, hash
  
  0,  111258000,  111258000,        0,     6979, 6215f060, S=1,        1, 67d220bc
  
  0,  111689100,  111689100,        0,       25, e60e94fa, S=1,        1, 67d220bc
  
  0,  113230800,  113230800,        0,     4423, f811be62, S=1,        1, 67d220bc
  
  0,  113561550,  113561550,        0,       25, 6db8d81f, S=1,        1, 67d220bc
  
  0,  113788800,  113788800,        0,     8247, 8b494779, S=1,        1, 67d220bc
  
  0,  114191190,  114191190,        0,       25, a205e183, S=1,        1, 67d220bc
  
  
  
  0,  116868607,  116868607,        0,     1119, e5d11188, S=1,        1, 67d220bc
  
  0,  116868607,  116868607,        0,       28, 11e09861, S=1,        1, 67d220bc
  
  0,  116868607,  116868607,        0,     1122, 8320a3f5, S=1,        1, 67d220bc
  
  0,  116868607,  116868607,        0,       28, e896fa37, S=1,        1, 67d220bc
  
  
  
  0,  117205200,  117205200,        0,     3583, 47b23f27, S=1,        1, 67d220bc
  
  0,  117611640,  117611640,        0,       25, e5ae32ed, S=1,        1, 67d220bc
  
  0,  117709200,  117709200,        0,     1119, 208b4f80, S=1,        1, 67d220bc
  
  0,  117830970,  117830970,        0,       25, 2a130b71, S=1,        1, 67d220bc
  
  0,  117846000,  117846000,        0,     3105, f179a4f0, S=1,        1, 67d220bc
  
  0,  118148040,  118148040,        0,       25, 29b3ad66, S=1,        1, 67d220bc
  
  0,  120146410,  120146410,        0,     1119, 714ef5d1, S=1,        1, 67d220bc
  
  0,  120146410,  120146410,        0,       28, bbad7fed, S=1,        1, 67d220bc
  
  0,  120708000,  120708000,        0,     2060, 703084f7, S=1,        1, 67d220bc
  
  0,  120855420,  120855420,        0,       25, 6db8d81f, S=1,        1, 67d220bc
  
  0,  121122000,  121122000,        0,     2184, 04a7be71, S=1,        1, 67d220bc
  
  0,  121395330,  121395330,        0,       25, a205e183, S=1,        1, 67d220bc

  Thes are the lines from SRT file where the warning happens :

  146
  
  00:21:34,840 --> 00:21:36,600
  
  Make!
  
  147
  
  00:21:42,280 --> 00:21:46,800
  
  Make! Hei, Make. Make!
  
  148
  
  00:21:47,880 --> 00:21:49,240
  
  Make!
  
  149
  
  00:21:49,400 --> 00:21:52,760
  
  Odota minua, Make!
  
  150
  
  00:22:00,400 --> 00:22:01,760
  
  Make!

  Sometimes muxing subtitles in different order (for example Finish before Danish and then Swedish) would solve this problem, but i would like to know why such things are happening.

• Date and segment comparison feature

  31 octobre 2019, par Matomo Core Team — Analytics Tips, Development

  Get a clearer picture with the date and segment comparison feature

  What can you do with it ? What are the benefits ?

  Make informed decisions faster by easily comparing different segments and dates with each other.

  Compare report data for multiple segments next to each other

  

  Directly compare the behaviour of visitors from different segments e.g. customers with accounts vs. customers without accounts. Segment comparisons are a powerful way to compare different audience ; learn which ones perform better ; and in what way their actions differ. 

  Compare report data for two time periods next to each other

  

  See how your website performs compared to the previous month/week/year. Including seeing trends over those periods. Say, your business always picks up at the same times within a year, or there’s a sag in business for every user segment over this year and the last except one.

  By being able to compare date ranges you are able to get a quick overview of trends and period to period performance. Has a campaign worked better in September than in October ? Get an instant look by having the side-by-side comparison in Matomo.

  What is it capable of ?

  It lets you ask the question, “What is different ?”

  If you look at reports you’ll only see how people behave overall and if you look at specific segments you’ll see how they behave at face value, however, if you compare data together you’ll be quickly informed on what makes them unique. This data is still there when you don’t use the comparison feature, it’s just buried. Comparing data highlights discrepancies and leads to important questions and answers.

  For example, perhaps some class of users have very low engagement on a specific day compared to the rest of your visitors, and perhaps those users are responsible for an outsized proportion of churn. 

  Who could benefit from it, and why ?

  Everyone can benefit from using it (and probably should use it). It’s yours to experiment with ! You shouldn’t feel restricted to only comparing between the current and last period, or having questions before you start comparing. Follow your instincts and see what pops out when data from different segments is laid out next to each other.

  Where can you find it in Matomo ?

  • Segment comparison is activated by the new icon in the segment selector

  

  • Date comparison can be found in the calendar section of Matomo

  

  • The list of active comparisons is visible at the top of the page for all pages that support comparison
  • Comparisons are visible in every report that supports comparing data, and reports that do not support it will display a message saying so

  How do you use it ?

  • To compare segments, click the icon in the segment selector
  • To compare periods, click the ‘compare’ checkbox in the period selector, then select what period you want to compare it against in the dropdown (previous period, previous year, or a custom range)
  • When comparisons are active, view your reports as normal

  Take it away !

  The comparison feature is a new tool from Matomo 3.12.0 that highlights discrepancies and differences in data that can lead to more clarity and understanding, so we’d encourage everyone to use it. 

  Try it out today in your Matomo and see the power behind this new data comparison mode !

• av_interleaved_write_frame hang forver when network broken

  8 octobre 2019, par DJI_lover

  I am using ffmpeg to stream video to rtmp server.But when network broken,my streaming program seem to hang on in av_interleaved_write_frame() and there is no error output.if I recover the network within seconds,the program resume to work within seconds.But if I recover the network after 20 seconds or even longer，my program freeze forever with no error.I want to interupt the av_interleaved_write_frame() when it hang up for a period of time and restart my whole streaming program.Could someone tell me how to do ,thanks !!