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• Progress with rtc.io

  12 août 2014, par silvia

  At the end of July, I gave a presentation about WebRTC and rtc.io at the WDCNZ Web Dev Conference in beautiful Wellington, NZ.

  

  Putting that talk together reminded me about how far we have come in the last year both with the progress of WebRTC, its standards and browser implementations, as well as with our own small team at NICTA and our rtc.io WebRTC toolbox.

  

  One of the most exciting opportunities is still under-exploited : the data channel. When I talked about the above slide and pointed out Bananabread, PeerCDN, Copay, PubNub and also later WebTorrent, that’s where I really started to get Web Developers excited about WebRTC. They can totally see the shift in paradigm to peer-to-peer applications away from the Server-based architecture of the current Web.

  Many were also excited to learn more about rtc.io, our own npm nodules based approach to a JavaScript API for WebRTC.

  

  We believe that the World of JavaScript has reached a critical stage where we can no longer code by copy-and-paste of JavaScript snippets from all over the Web universe. We need a more structured module reuse approach to JavaScript. Node with JavaScript on the back end really only motivated this development. However, we’ve needed it for a long time on the front end, too. One big library (jquery anyone ?) that does everything that anyone could ever need on the front-end isn’t going to work any longer with the amount of functionality that we now expect Web applications to support. Just look at the insane growth of npm compared to other module collections :

  

  For those that – like myself – found it difficult to understand how to tap into the sheer power of npm modules as a font end developer, simply use browserify. npm modules are prepared following the CommonJS module definition spec. Browserify works natively with that and “compiles” all the dependencies of a npm modules into a single bundle.js file that you can use on the front end through a script tag as you would in plain HTML. You can learn more about browserify and module definitions and how to use browserify.

  For those of you not quite ready to dive in with browserify we have prepared prepared the rtc module, which exposes the most commonly used packages of rtc.io through an “RTC” object from a browserified JavaScript file. You can also directly download the JavaScript file from GitHub.

  

  So, I hope you enjoy rtc.io and I hope you enjoy my slides and large collection of interesting links inside the deck, and of course : enjoy WebRTC ! Thanks to Damon, JEeff, Cathy, Pete and Nathan – you’re an awesome team !

  On a side note, I was really excited to meet the author of browserify, James Halliday (@substack) at WDCNZ, whose talk on “building your own tools” seemed to take me back to the times where everything was done on the command-line. I think James is using Node and the Web in a way that would appeal to a Linux Kernel developer. Fascinating !!

• Can ffmpeg copy parts from an rmvb file without re-encoding ?

  24 juin 2017, par Eng. M.Hamdy

  I want to fast copy parts from an rmvb file without re-encoding. This command works fine with mp4 files but not with rmbv (I dropped start time and duration here) :

  ffmpeg -i input -c copy output

  when I use it with rmvb like this :

  ffmpeg -i 1.rmvb -c copy 1.mp4

  I get this error :

  [mp4 @ 00bb8980] Could not find tag for codec rv40 in stream #0, codec
  not curre ntly supported in container Could not write header for
  output file #0 (incorrect codec parameters ?) : Invali d argument
  Stream mapping : Stream #0:1 -> #0:0 (copy) Stream #0:0 -> #0:1
  (copy)

  I also tried this :

  ffmpeg -i 1.rmvb -c copy 2.rmvb

  and got this error :

  [NULL @ 04748980] Unable to find a suitable output format for ’2.rmvb’
  2.rmvb : Invalid argument

  I tried this command :

  ffmpeg -i 1.rmvb -c:v copy -c:a aac -strict experimental -b:a 128k 1.mp4

  and got this error :

  [mp4 @ 046e0020] Could not find tag for codec rv40 in stream #0, codec
  not curre ntly supported in container Could not write header for
  output file #0 (incorrect codec parameters ?) : Invali d argument Error
  initializing output stream 0:1 — [aac @ 046e1bc0] Qavg : nan
  Conversion failed !

  I read this topic :
  but the solution does not work for me.. After many trials, this is the command that worked (and took too long time) :

  ffmpeg -i 1.rmvb -c:v libx264 -b:a 32k output.mp4

  But I do not want to re-encode the file. Any solution ?

  Edit :
  I tried :

  ffmpeg -i 1.rmvb -c copy 1.mkv

  ffmpeg version N-86447-gfeb13ae Copyright (c) 2000-2017 the FFmpeg
  developers built with gcc 7.1.0 (GCC) configuration : —enable-gpl
  —enable-version3 —enable-cuda —enable-cuvid —e nable-d3d11va —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth — enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls
  —enable-iconv
  —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-li bfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug -
  -enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enabl e-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-li bsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolam e —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable
  -libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-zlib libavutil 55. 63.100 / 55. 63.100 libavcodec 57. 98.100 /
  57. 98.100 libavformat 57. 73.100 / 57. 73.100 libavdevice 57. 7.100 / 57. 7.100 libavfilter 6. 92.100 / 6. 92.100 libswscale 4. 7.101 / 4. 7.101 libswresample 2. 8.100 /
  2. 8.100 libpostproc 54. 6.100 / 54. 6.100 [rm @ 033a7520] Invalid stream index 2 for index at pos 206099254 Input #0, rm, from
  ’1.rmvb’ : Metadata :
  title : ArabSeed.CoM
  author : ArabSeed.CoM
  copyright : ArabSeed.CoM
  comment :
  ASMRuleBook : #($Bandwidth >= 0),Stream0Bandwidth = 64082, Stream1Bandwi dth = 285918 ;
  Audiences : Easy RealMedia Tool’s Audience ;
  audioMode : music
  Creation Date : 4/22/2010 4:31:14
  Description : This File is Created by Easy RealMedia Tools@ !
  Email : rick@redcheek.net
  Generated By : Easy RealMedia Tools V1.8x
  HomeWeb : http://redcheek.net
  Keywords : ArabSeed.CoM
  Modification Date : 4/22/2010 4:31:14
  videoMode : normal Duration : 01:16:35.69, start : 0.000000, bitrate : 358 kb/s
  Stream #0:0 : Audio : cook (cook / 0x6B6F6F63), 44100 Hz, stereo, fltp, 64 kb/ s
  Stream #0:1 : Video : rv40 (RV40 / 0x30345652), yuv420p, 720x408, 280 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc Output #0, matroska, to
  ’1.mkv’ : Metadata :
  title : ArabSeed.CoM
  author : ArabSeed.CoM
  copyright : ArabSeed.CoM
  comment :
  ASMRuleBook : #($Bandwidth >= 0),Stream0Bandwidth = 64082, Stream1Bandwi dth = 285918 ;
  Audiences : Easy RealMedia Tool’s Audience ;
  audioMode : music
  Creation Date : 4/22/2010 4:31:14
  Description : This File is Created by Easy RealMedia Tools@ !
  Email : rick@redcheek.net
  Generated By : Easy RealMedia Tools V1.8x
  HomeWeb : http://redcheek.net
  Keywords : ArabSeed.CoM
  Modification Date : 4/22/2010 4:31:14
  videoMode : normal
  encoder : Lavf57.73.100
  Stream #0:0 : Video : rv40 (RV40 / 0x30345652), yuv420p, 720x408, q=2-31, 280 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
  Stream #0:1 : Audio : cook ([255][255][255][255] / 0xFFFFFFFF), 44100 Hz, ster eo, fltp, 64 kb/s Stream mapping : Stream #0:1 -> #0:0
  (copy) Stream #0:0 -> #0:1 (copy) Press [q] to stop, [?] for help
  [matroska @ 05228980] The Matroska muxer does not yet support muxing
  cook av_interleaved_write_frame() : Not yet implemented in FFmpeg,
  patches welcome Error writing trailer of 1.mkv : Not yet implemented in
  FFmpeg, patches welcome frame= 21 fps=0.0 q=-1.0 Lsize= 0kB
  time=00:00:01.48 bitrate= 0.0kbits /s speed= 148x video:2kB
  audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ove
  rhead : unknown Conversion failed !

  I also tried :

  ffmpeg -i 1.rmvb -c copy 1.avi
  
  
  
  ffmpeg version N-86447-gfeb13ae Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --e
  
  nable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --
  
  enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
  
  --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-li
  
  bfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug -
  
  -enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enabl
  
  e-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-li
  
  bsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolam
  
  e --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
   --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
  
  -libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 63.100 / 55. 63.100
  
    libavcodec     57. 98.100 / 57. 98.100
  
    libavformat    57. 73.100 / 57. 73.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 92.100 /  6. 92.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [rm @ 00077520] Invalid stream index 2 for index at pos 206099254
  
  Input #0, rm, from '1.rmvb':
  
    Metadata:
  
      title           : ArabSeed.CoM
  
      author          : ArabSeed.CoM
  
      copyright       : ArabSeed.CoM
  
      comment         :
  
      ASMRuleBook     : #($Bandwidth >= 0),Stream0Bandwidth = 64082, Stream1Bandwi
  
  dth = 285918;
  
      Audiences       : Easy RealMedia Tool's Audience;
  
      audioMode       : music
  
      Creation Date   : 4/22/2010 4:31:14
  
      Description     : This File is Created by Easy RealMedia Tools@!
  
      Email           : rick@redcheek.net
  
      Generated By    : Easy RealMedia Tools V1.8x
  
      HomeWeb         : http://redcheek.net
  
      Keywords        : ArabSeed.CoM
  
      Modification Date: 4/22/2010 4:31:14
  
      videoMode       : normal
  
    Duration: 01:16:35.69, start: 0.000000, bitrate: 358 kb/s
  
      Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 44100 Hz, stereo, fltp, 64 kb/
  
  s
  
      Stream #0:1: Video: rv40 (RV40 / 0x30345652), yuv420p, 720x408, 280 kb/s, 25
  
   fps, 25 tbr, 1k tbn, 1k tbc
  
  Could not write header for output file #0 (incorrect codec parameters ?): Operat
  
  ion not permitted
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (copy)
  
      Last message repeated 1 times

• Adding some kind of subtitle to an mp4 with ffmpeg

  23 juin 2017, par Steven Van Ingelgem

  I have a subtitle (it certainly looks like it), but I don’t know how to add it into an MP4 I’m creating.
  First a hexdump of the subtitle :

  00000000  00 00 00 18 66 74 79 70  69 73 6f 36 00 00 00 00  |....ftypiso6....|
  
  00000010  69 73 6f 36 64 61 73 68  00 00 00 28 66 72 65 65  |iso6dash...(free|
  
  00000020  55 53 50 20 62 79 20 43  6f 64 65 53 68 6f 70 11  |USP by CodeShop.|
  
  00000030  11 11 11 11 11 11 11 11  11 11 11 11 11 11 11 11  |................|
  
  00000040  00 00 02 1d 6d 6f 6f 76  00 00 00 6c 6d 76 68 64  |....moov...lmvhd|
  
  00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 01  |................|
  
  00000060  00 00 00 00 00 01 00 00  01 00 00 00 00 00 00 00  |................|
  
  00000070  00 00 00 00 00 01 00 00  00 00 00 00 00 00 00 00  |................|
  
  *
  
  00000090  00 00 00 00 40 00 00 00  00 00 00 00 00 00 00 00  |....@...........|
  
  000000a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
  
  000000b0  00 00 00 02 00 00 01 81  74 72 61 6b 00 00 00 5c  |........trak...\|
  
  000000c0  74 6b 68 64 00 00 00 07  00 00 00 00 00 00 00 00  |tkhd............|
  
  000000d0  00 00 00 01 00 00 00 00  00 00 00 00 00 00 00 00  |................|
  
  000000e0  00 00 00 00 00 00 00 00  00 00 00 00 00 01 00 00  |................|
  
  *
  
  00000100  00 00 00 00 00 00 00 00  00 00 00 00 40 00 00 00  |............@...|
  
  00000110  00 00 00 00 00 00 00 00  00 00 01 1d 6d 64 69 61  |............mdia|
  
  00000120  00 00 00 20 6d 64 68 64  00 00 00 00 00 00 00 00  |... mdhd........|
  
  00000130  00 00 00 00 00 00 03 e8  00 00 00 00 39 84 00 00  |............9...|
  
  00000140  00 00 00 35 68 64 6c 72  00 00 00 00 00 00 00 00  |...5hdlr........|
  
  00000150  73 75 62 74 00 00 00 00  00 00 00 00 00 00 00 00  |subt............|
  
  00000160  55 53 50 20 53 75 62 74  69 74 6c 65 20 48 61 6e  |USP Subtitle Han|
  
  00000170  64 6c 65 72 00 00 00 00  c0 6d 69 6e 66 00 00 00  |dler.....minf...|
  
  00000180  0c 73 74 68 64 00 00 00  00 00 00 00 24 64 69 6e  |.sthd.......$din|
  
  00000190  66 00 00 00 1c 64 72 65  66 00 00 00 00 00 00 00  |f....dref.......|
  
  000001a0  01 00 00 00 0c 75 72 6c  20 00 00 00 01 00 00 00  |.....url .......|
  
  000001b0  88 73 74 62 6c 00 00 00  3c 73 74 73 64 00 00 00  |.stbl.../www.|
  
  000001e0  77 33 2e 6f 72 67 2f 6e  73 2f 74 74 6d 6c 00 00  |w3.org/ns/ttml..|
  
  000001f0  00 00 00 00 10 73 74 74  73 00 00 00 00 00 00 00  |.....stts.......|
  
  00000200  00 00 00 00 10 73 74 73  63 00 00 00 00 00 00 00  |.....stsc.......|
  
  00000210  00 00 00 00 14 73 74 73  7a 00 00 00 00 00 00 00  |.....stsz.......|
  
  00000220  00 00 00 00 00 00 00 00  10 73 74 63 6f 00 00 00  |.........stco...|
  
  00000230  00 00 00 00 00 00 00 00  28 6d 76 65 78 00 00 00  |........(mvex...|
  
  00000240  20 74 72 65 78 00 00 00  00 00 00 00 01 00 00 00  | trex...........|
  
  00000250  01 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
  
  00000260  18 73 74 79 70 69 73 6f  36 00 00 00 00 69 73 6f  |.stypiso6....iso|
  
  00000270  36 6d 73 64 68 00 00 00  28 66 72 65 65 55 53 50  |6msdh...(freeUSP|
  
  00000280  20 62 79 20 43 6f 64 65  53 68 6f 70 11 11 11 11  | by CodeShop....|
  
  00000290  11 11 11 11 11 11 11 11  11 11 11 11 11 00 00 00  |................|
  
  000002a0  2c 73 69 64 78 00 00 00  00 00 00 00 01 00 00 03  |,sidx...........|
  
  000002b0  e8 00 00 00 00 00 00 00  00 00 00 00 01 00 00 0f  |................|
  
  000002c0  09 00 00 ea 60 90 00 00  00 00 00 00 68 6d 6f 6f  |....`.......hmoo|
  
  000002d0  66 00 00 00 10 6d 66 68  64 00 00 00 00 00 00 00  |f....mfhd.......|
  
  000002e0  01 00 00 00 50 74 72 61  66 00 00 00 14 74 66 68  |....Ptraf....tfh|
  
  000002f0  64 00 02 00 02 00 00 00  01 00 00 00 01 00 00 00  |d...............|
  
  00000300  14 74 66 64 74 01 00 00  00 00 00 00 00 00 00 00  |.tfdt...........|
  
  00000310  00 00 00 00 20 74 72 75  6e 00 00 07 01 00 00 00  |.... trun.......|
  
  00000320  01 00 00 00 70 00 00 ea  60 00 00 0e 99 02 80 00  |....p...`.......|
  
  00000330  40 00 00 0e a1 6d 64 61  74 3c 3f 78 6d 6c 20 76  |@....mdat<?xml v|
  
  00000340  65 72 73 69 6f 6e 3d 22  31 2e 30 22 20 65 6e 63  |ersion="1.0" enc|
  
  00000350  6f 64 69 6e 67 3d 22 75  74 66 2d 38 22 3f 3e 3c  |oding="utf-8"?><|
  
  00000360  74 74 20 78 6d 6c 6e 73  3d 22 68 74 74 70 3a 2f  |tt xmlns="http:/|
  
  00000370  2f 77 77 77 2e 77 33 2e  6f 72 67 2f 6e 73 2f 74  |/www.w3.org/ns/t|
  
  00000380  74 6d 6c 22 20 78 6d 6c  6e 73 3a 73 6d 70 74 65  |tml" xmlns:smpte|
  
  00000390  3d 22 68 74 74 70 3a 2f  2f 77 77 77 2e 73 6d 70  |="http://www.smp|
  
  000003a0  74 65 2d 72 61 2e 6f 72  67 2f 73 63 68 65 6d 61  |te-ra.org/schema|
  
  000003b0  73 2f 32 30 35 32 2d 31  2f 32 30 31 30 2f 73 6d  |s/2052-1/2010/sm|

  I honestly have never seen anything like this before...

  So the command I’m running now is this :

  ffmpeg -y -i ’audionld#24000.mp4’ -i ’audionld#48000.mp4’ -i
  ’textnld.mp4’ -i ’video.mp4’ -map 0:a -map 1:a -map 2:d -map 3:v
  -metadata:s:a:0 language=nld -metadata:s:a:1 language=nld -acodec copy -bsf:a aac_adtstoasc -vcodec copy -c:d copy -movflags faststart "test.mp4" 2>&1

  Which results in this output :

  ffmpeg version 3.2.5-1~bpo8+1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --prefix=/usr --extra-version='1~bpo8+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 --disable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'audionld#24000.mp4':
  
    Metadata:
  
      major_brand     : iso6
  
      minor_version   : 0
  
      compatible_brands: iso6dash
  
    Duration: 00:03:06.07, start: 0.000000, bitrate: 64 kb/s
  
      Stream #0:0(nld): Audio: aac (HE-AAC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 62 kb/s (default)
  
      Metadata:
  
        handler_name    : USP Sound Handler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'audionld#48000.mp4':
  
    Metadata:
  
      major_brand     : iso6
  
      minor_version   : 0
  
      compatible_brands: iso6dash
  
    Duration: 00:03:06.07, start: 0.000000, bitrate: 95 kb/s
  
      Stream #1:0(nld): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
  
      Metadata:
  
        handler_name    : USP Sound Handler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'textnld.mp4':
  
    Metadata:
  
      major_brand     : iso6
  
      minor_version   : 0
  
      compatible_brands: iso6dash
  
    Duration: 00:03:05.76, bitrate: 0 kb/s
  
      Stream #2:0(nld): Data: none (stpp / 0x70707473), 0 kb/s (default)
  
      Metadata:
  
        handler_name    : USP Subtitle Handler
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
    Metadata:
  
      major_brand     : iso6
  
      minor_version   : 0
  
      compatible_brands: iso6dash
  
    Duration: 00:03:06.08, start: 0.000000, bitrate: 152 kb/s
  
      Stream #3:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 416x234 [SAR 1:1 DAR 16:9], 144 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : USP Video Handler
  
        encoder         : Elemental H.264
  
  [mp4 @ 0x7f15299c4520] Could not find tag for codec none in stream #2, codec not currently supported in container
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argumentStream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
    Stream #2:0 -> #0:2 (copy)
  
    Stream #3:0 -> #0:3 (copy)
  
      Last message repeated 1 times

  This gives the error :
  Could not find tag for codec none in stream #2, codec not currently supported in container
  Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument

  So I tried playing with the map like this :

  -map 2:s
  ==> Gives me :
  Stream map ’2:s’ matches no streams.
  To ignore this, add a trailing ’ ?’ to the map.

  -map 2:s ?
  ==> Gives me no error, but the subtitle stream isn’t added into the final file.

  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #1:0 -> #0:1 (copy)
  
    Stream #3:0 -> #0:2 (copy)

  Maybe I first have to convert the subtitle into srt or such, but for that I don’t find on google what type of file this is.

  Any help would be greatly appreciated !

  Thanks

  ---EDIT---

  Hereby the code that I am using to convert this in PHP :

    private function convert_TTML_subtitle_file($orig) {
  
      if ( $orig == '' || !file_exists($orig) ) {
  
        return false;
  
      }
  
  
  
      $f = file_get_contents($orig);
  
      $pos = stripos($f, '<tt xmlns="http://www.w3.org/ns/ttml" if="if" false="false" return="return" while="while">body->div->p as $p ) {
  
            $txt .= "{$counter}\r\n";
  
            $counter++;
  
            $txt .= $p['begin'] . ' --> ' . $p['end'] . "\r\n";
  
            $txt .= $p->span . "\r\n\r\n";
  
          }
  
        }
  
        $cur += $curSize;
  
      }
  
  
  
      $fname = tempnam(getcwd(), 'sub');
  
      file_put_contents($fname, $txt);
  
      return $fname;
  
    }
  
  </tt>