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• FFMPEG : How to chose a stream from all stream

  3 mars 2016, par combo_ci

  I try to convert a UDP stream (that genrated from DVB signal) to HLS m3u8 file with this code :

  ffmpeg -i udp://239.1.2.1:60001 -acodec aac -strict -2 -vcodec libx264 -hls_wrap 100 -f hls /var/www/html/ts/1.m3u8 

  UDP stream contain 1 channel (in this case IRIB-TV1).

  When i run this code ffmpeg detect all of service and channel that streamed from DVB card with this message :

  Input #0, mpegts, from 'udp://239.1.2.1:60001':
  
  Duration: N/A, start: 77906.812644, bitrate: N/A
  
  Program 101 
  
  Metadata:
  
    service_name    : IRIB-TV1
  
    service_provider: IRIB
  
  Stream #0:0[0x3f2]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg), 720x576 [SAR 12:11 DAR 15:11], 25 fps, 50 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x3f3](per): Audio: aac_latm ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
  
  Program 102 
  
  Metadata:
  
    service_name    : IRIB-TV2
  
    service_provider: IRIB
  
  Program 103 
  
  Metadata:
  
    service_name    : IRIB-TV3
  
    service_provider: IRIB
  
  Program 104 
  
  Metadata:
  
    service_name    : IRIB-TV4
  
    service_provider: IRIB

  As you see ffmpeg finf 4 channel in UDP stream, But VLC play only channel 1(IRIB-TV1).

  Now i have have 2 question :

  1-Can I get all channel and service via this ffmpeg code ?

  2-Can i choose a spesial stream from this ffmpeg code ?(i know that ffmpeg can choose a stream with -map otion but i want to choose other service_name that in output log)

  output file is :

   ffmpeg version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened --extra-cflags= --extra-cxxflags= --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Splitting the commandline.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  Reading option '-timeout' ... matched as AVOption 'timeout' with argument '6000000'.
  
  Reading option '-i' ... matched as input file with argument 'udp://239.1.2.1:60001?fifo_size=50000'.
  
  Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'copy'.
  
  Reading option '-vcodec' ... matched as option 'vcodec' (force video codec ('copy' to copy stream)) with argument 'copy'.
  
  Reading option '-preset' ... matched as AVOption 'preset' with argument 'ultrafast'.
  
  Reading option '-flags' ... matched as AVOption 'flags' with argument '-global_header'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'hls'.
  
  Reading option '-hls_time' ... matched as AVOption 'hls_time' with argument '20'.
  
  Reading option '-hls_wrap' ... matched as AVOption 'hls_wrap' with argument '5'.
  
  Reading option '/var/www/html/ts/1.m3u8' ... matched as output file.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option loglevel (set logging level) with argument debug.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file udp://239.1.2.1:60001?fifo_size=50000.
  
  Successfully parsed a group of options.
  
  Opening an input file: udp://239.1.2.1:60001?fifo_size=50000.
  
  [udp @ 0x1967040] end receive buffer size reported is 131072
  
  [mpegts @ 0x1977380] Format mpegts probed with size=2048 and score=100
  
  [mpegts @ 0x1977380] stream=0 stream_type=1b pid=3f2 prog_reg_desc=
  
  [mpegts @ 0x1977380] stream=1 stream_type=11 pid=3f3 prog_reg_desc=
  
  [mpegts @ 0x1977380] Before avformat_find_stream_info() pos: 0 bytes read:14476 seeks:0
  
  [mpegts @ 0x1977380] parser not found for codec none, packets or times may be invalid.
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [mpegts @ 0x1977380] probing stream 1 pp:2500
  
  [mpegts @ 0x1977380] Probe with size=853, packets=1 detected loas with score=51
  
  [mpegts @ 0x1977380] probed stream 1
  
  [aac_latm @ 0x199e4e0] initializing latmctx
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] non-existing PPS 0 referenced
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] decode_slice_header error
  
  [h264 @ 0x199cc60] no frame!
  
  [h264 @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [h264 @ 0x199cc60] Frame num gap 397 393
  
  [h264 @ 0x199cc60] Frame num gap 397 394
  
  [h264 @ 0x199cc60] Frame num gap 397 395
  
  [h264 @ 0x199cc60] mmco: unref short failure
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] number of reference frames (0+4) exceeds max (3; probably corrupt input), discarding one
  
  [h264 @ 0x199cc60] no picture ooo
  
  [h264 @ 0x199cc60] Increasing reorder buffer to 2
  
  [h264 @ 0x199cc60] no picture ooo
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] no picture 
  
      Last message repeated 1 times
  
  [h264 @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
      Last message repeated 3 times
  
  [mpegts @ 0x1977380] max_analyze_duration 5000000 reached at 5034667 microseconds
  
  [mpegts @ 0x1977380] After avformat_find_stream_info() pos: 1142476 bytes read:1143604 seeks:0 frames:397
  
  Input #0, mpegts, from 'udp://239.1.2.1:60001?fifo_size=50000':
  
    Duration: N/A, start: 43581.024200, bitrate: N/A
  
    Program 101 
  
      Metadata:
  
        service_name    : IRIB-TV1
  
        service_provider: IRIB
  
      Stream #0:0[0x3f2], 274, 1/90000: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, bt470bg), 720x576 [SAR 12:11 DAR 15:11], 1/50, 25 fps, 50 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x3f3](per), 123, 1/90000: Audio: aac_latm ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
  
    Program 102 
  
      Metadata:
  
        service_name    : IRIB-TV2
  
        service_provider: IRIB
  
    Program 103 
  
      Metadata:
  
        service_name    : IRIB-TV3
  
        service_provider: IRIB
  
    Program 104 
  
      Metadata:
  
        service_name    : IRIB-TV4
  
        service_provider: IRIB
  
    Program 105 
  
      Metadata:
  
        service_name    : IRIB-TV5
  
        service_provider: IRIB
  
    Program 106 
  
      Metadata:
  
        service_name    : IRINN
  
        service_provider: IRIB
  
    Program 107 
  
      Metadata:
  
        service_name    : AMOOZESH
  
        service_provider: IRIB
  
    Program 108 
  
      Metadata:
  
        service_name    : QURAN
  
        service_provider: IRIB
  
    Program 119 
  
      Metadata:
  
        service_name    : SALAMAT
  
        service_provider: IRIB
  
    Program 120 
  
      Metadata:
  
        service_name    : NASIM
  
        service_provider: IRIB
  
    Program 151 
  
      Metadata:
  
        service_name    : RADIO IRAN
  
        service_provider: IRIB
  
    Program 152 
  
      Metadata:
  
        service_name    : RADIO PAYAM
  
        service_provider: IRIB
  
    Program 153 
  
      Metadata:
  
        service_name    : RADIO JAVAN
  
        service_provider: IRIB
  
    Program 154 
  
      Metadata:
  
        service_name    : RADIO MAAREF
  
        service_provider: IRIB
  
    Program 155 
  
      Metadata:
  
        service_name    : RADIO QURAN
  
        service_provider: IRIB
  
    Program 156 
  
      Metadata:
  
        service_name    : RADIO FARHANG
  
        service_provider: IRIB
  
    Program 157 
  
      Metadata:
  
        service_name    : RADIO SALAMAT
  
        service_provider: IRIB
  
    Program 158 
  
      Metadata:
  
        service_name    : RADIO VARZESH
  
        service_provider: IRIB
  
    Program 159 
  
      Metadata:
  
        service_name    : RADIO EGHTESAD
  
        service_provider: IRIB
  
    Program 160 
  
      Metadata:
  
        service_name    : RADIO TEHRAN
  
        service_provider: IRIB
  
    Program 161 
  
      Metadata:
  
        service_name    : RADIO AVAA
  
        service_provider: IRIB
  
    Program 162 
  
      Metadata:
  
        service_name    : RADIO NAMAYESH
  
        service_provider: IRIB
  
    Program 163 
  
      Metadata:
  
        service_name    : RADIO SABA
  
        service_provider: IRIB
  
    Program 164 
  
      Metadata:
  
        service_name    : English Radio World Service
  
        service_provider: IRIB
  
    Program 166 
  
      Metadata:
  
        service_name    : Arabic Radio World Service
  
        service_provider: IRIB
  
    Program 167 
  
      Metadata:
  
        service_name    : RADIO BAHARAN
  
        service_provider: IRIB
  
    Program 169 
  
      Metadata:
  
        service_name    : RADIO TELAVAT
  
        service_provider: IRIB
  
    Program 170 
  
      Metadata:
  
        service_name    : RADIO GOFTEGO
  
        service_provider: IRIB
  
  Successfully opened the file.
  
  Parsing a group of options: output file /var/www/html/ts/1.m3u8.
  
  Applying option acodec (force audio codec ('copy' to copy stream)) with argument copy.
  
  Applying option vcodec (force video codec ('copy' to copy stream)) with argument copy.
  
  Applying option f (force format) with argument hls.
  
  Successfully parsed a group of options.
  
  Opening an output file: /var/www/html/ts/1.m3u8.
  
  Successfully opened the file.
  
  [mpegts @ 0x1967180] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
  
      Last message repeated 1 times
  
  [mpegts @ 0x1967180] muxrate VBR, pcr every 2 pkts, sdt every 200, pat/pmt every 40 pkts
  
  Output #0, hls, to '/var/www/html/ts/1.m3u8':
  
    Metadata:
  
      encoder         : Lavf56.4.101
  
      Stream #0:0, 0, 1/90000: Video: h264 ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 12:11 DAR 15:11], 1/25, q=2-31, 25 fps, 90k tbn, 25 tbc
  
      Stream #0:1(per), 0, 1/90000: Audio: aac_latm ([17][0][0][0] / 0x0011), 48000 Hz, stereo
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [NULL @ 0x199cc60] Current profile doesn't provide more RBSP data in PPS, skipping
  
  [AVIOContext @ 0x19a9860] Statistics: 0 seeks, 896 writeouts=N/A    
  
  [hls @ 0x1a65ca0] EXT-X-MEDIA-SEQUENCE:0
  
  [AVIOContext @ 0x1d162e0] Statistics: 0 seeks, 1 writeouts
  
  [AVIOContext @ 0x1966b40] Statistics: 0 seeks, 27 writeouts
  
  [hls @ 0x1a65ca0] EXT-X-MEDIA-SEQUENCE:0
  
  [AVIOContext @ 0x199b7a0] Statistics: 0 seeks, 1 writeouts
  
  frame=  826 fps= 69 q=-1.0 Lsize=N/A time=00:00:20.63 bitrate=N/A    
  
  video:2611kB audio:68kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Input file #0 (udp://239.1.2.1:60001?fifo_size=50000):
  
    Input stream #0:0 (video): 872 packets read (2779202 bytes); 
  
    Input stream #0:1 (audio): 405 packets read (69222 bytes); 
  
    Total: 1277 packets (2848424 bytes) demuxed
  
  Output file #0 (/var/www/html/ts/1.m3u8):
  
    Output stream #0:0 (video): 826 packets muxed (2673485 bytes); 
  
    Output stream #0:1 (audio): 405 packets muxed (69222 bytes); 
  
    Total: 1231 packets (2742707 bytes) muxed
  
  0 frames successfully decoded, 0 decoding errors
  
  [AVIOContext @ 0x1967ce0] Statistics: 3884832 bytes read, 0 seeks
  
  Received signal 2: terminating.

• My journey to Coviu

  27 octobre 2015, par silvia

  My new startup just released our MVP – this is the story of what got me here.

  I love creating new applications that let people do their work better or in a manner that wasn’t possible before.

  My first such passion was as a student intern when I built a system for a building and loan association’s monthly customer magazine. The group I worked with was managing their advertiser contacts through a set of paper cards and I wrote a dBase based system (yes, that long ago) that would manage their customer relationships. They loved it – until it got replaced by an SAP system that cost 100 times what I cost them, had really poor UX, and only gave them half the functionality. It was a corporate system with ongoing support, which made all the difference to them.

  The story repeated itself with a CRM for my Uncle’s construction company, and with a resume and quotation management system for Accenture right after Uni, both of which I left behind when I decided to go into research.

  Even as a PhD student, I never lost sight of challenges that people were facing and wanted to develop technology to overcome problems. The aim of my PhD thesis was to prepare for the oncoming onslaught of audio and video on the Internet (yes, this was 1994 !) by developing algorithms to automatically extract and locate information in such files, which would enable users to structure, index and search such content.

  Many of the use cases that we explored are now part of products or continue to be challenges : finding music that matches your preferences, identifying music or video pieces e.g. to count ads on the radio or to mark copyright infringement, or the automated creation of video summaries such as trailers.

  

  This continued when I joined the CSIRO in Australia – I was working on segmenting speech into words or talk spurts since that would simplify captioning & subtitling, and on MPEG-7 which was a (slightly over-engineered) standard to structure metadata about audio and video.

  In 2001 I had the idea of replicating the Web for videos : i.e. creating hyperlinked and searchable video-only experiences. We called it “Annodex” for annotated and indexed video and it needed full-screen hyperlinked video in browsers – man were we ahead of our time ! It was my first step into standards, got several IETF RFCs to my name, and started my involvement with open codecs through Xiph.

  Around the time that YouTube was founded in 2006, I founded Vquence – originally a video search company for the Web, but pivoted to a video metadata mining company. Vquence still exists and continues to sell its data to channel partners, but it lacks the user impact that has always driven my work.

  As the video element started being developed for HTML5, I had to get involved. I contributed many use cases to the W3C, became a co-editor of the HTML5 spec and focused on video captioning with WebVTT while contracting to Mozilla and later to Google. We made huge progress and today the technology exists to publish video on the Web with captions, making the Web more inclusive for everybody. I contributed code to YouTube and Google Chrome, but was keen to make a bigger impact again.

  The opportunity came when a couple of former CSIRO colleagues who now worked for NICTA approached me to get me interested in addressing new use cases for video conferencing in the context of WebRTC. We worked on a kiosk-style solution to service delivery for large service organisations, particularly targeting government. The emerging WebRTC standard posed many technical challenges that we addressed by building rtc.io , by contributing to the standards, and registering bugs on the browsers.

  Fast-forward through the development of a few further custom solutions for customers in health and education and we are starting to see patterns of need emerge. The core learning that we’ve come away with is that to get things done, you have to go beyond “talking heads” in a video call. It’s not just about seeing the other person, but much more about having a shared view of the things that need to be worked on and a shared way of interacting with them. Also, we learnt that the things that are being worked on are quite varied and may include multiple input cameras, digital documents, Web pages, applications, device data, controls, forms.

  So we set out to build a solution that would enable productive remote collaboration to take place. It would need to provide an excellent user experience, it would need to be simple to work with, provide for the standard use cases out of the box, yet be architected to be extensible for specialised data sharing needs that we knew some of our customers had. It would need to be usable directly on Coviu.com, but also able to integrate with specialised applications that some of our customers were already using, such as the applications that they spend most of their time in (CRMs, practice management systems, learning management systems, team chat systems). It would need to require our customers to sign up, yet their clients to join a call without sign-up.

  Collaboration is a big problem. People are continuing to get more comfortable with technology and are less and less inclined to travel distances just to get a service done. In a country as large as Australia, where 12% of the population lives in rural and remote areas, people may not even be able to travel distances, particularly to receive or provide recurring or specialised services, or to achieve work/life balance. To make the world a global village, we need to be able to work together better remotely.

  The need for collaboration is being recognised by specialised Web applications already, such as the LiveShare feature of Invision for Designers, Codassium for pair programming, or the recently announced Dropbox Paper. Few go all the way to video – WebRTC is still regarded as a complicated feature to support.

  

  With Coviu, we’d like to offer a collaboration feature to every Web app. We now have a Web app that provides a modern and beautifully designed collaboration interface. To enable other Web apps to integrate it, we are now developing an API. Integration may entail customisation of the data sharing part of Coviu – something Coviu has been designed for. How to replicate the data and keep it consistent when people collaborate remotely – that is where Coviu makes a difference.

  We have started our journey and have just launched free signup to the Coviu base product, which allows individuals to own their own “room” (i.e. a fixed URL) in which to collaborate with others. A huge shout out goes to everyone in the Coviu team – a pretty amazing group of people – who have turned the app from an idea to reality. You are all awesome !

  With Coviu you can share and annotate :

  • images (show your mum photos of your last holidays, or get feedback on an architecture diagram from a customer),
  • pdf files (give a presentation remotely, or walk a customer through a contract),
  • whiteboards (brainstorm with a colleague), and
  • share an application window (watch a YouTube video together, or work through your task list with your colleagues).

  All of these are regarded as “shared documents” in Coviu and thus have zooming and annotations features and are listed in a document tray for ease of navigation.

  This is just the beginning of how we want to make working together online more productive. Give it a go and let us know what you think.

  http://coviu.com/

• Find out what device to use for capturing with ffmpeg ?

  14 septembre 2013, par wvxvw

  I'm trying to broadcast my screen and I cannot capture audio. There's one complication however. I don't have pulseaudio, and it simply doesn't work on my system, so installing it is out of question. Below is the command I'm trying :

  ffmpeg -f alsa -i ??? -f x11grab -s 1920x1200 -r 15 -i :0.0 \
  
      -acodec pcm_s16le -vcodec libx264 \
  
      -preset fast -pix_fmt yuv420p -s 1280x800 -threads 0 -f flv "$URL"

  Here's the list of my audio devices :

  $ aplay -L
  
  null
  
      Discard all samples (playback) or generate zero samples (capture)
  
  default:CARD=PCH
  
      HDA Intel PCH, ALC269VB Analog
  
      Default Audio Device
  
  sysdefault:CARD=PCH
  
      HDA Intel PCH, ALC269VB Analog
  
      Default Audio Device
  
  front:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      Front speakers
  
  surround40:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      4.0 Surround output to Front and Rear speakers
  
  surround41:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      4.1 Surround output to Front, Rear and Subwoofer speakers
  
  surround50:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      5.0 Surround output to Front, Center and Rear speakers
  
  surround51:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      5.1 Surround output to Front, Center, Rear and Subwoofer speakers
  
  surround71:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Analog
  
      7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
  
  iec958:CARD=PCH,DEV=0
  
      HDA Intel PCH, ALC269VB Digital
  
      IEC958 (S/PDIF) Digital Audio Output
  
  hdmi:CARD=NVidia,DEV=0
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output
  
  hdmi:CARD=NVidia,DEV=1
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output
  
  hdmi:CARD=NVidia,DEV=2
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output
  
  hdmi:CARD=NVidia,DEV=3
  
      HDA NVidia, HDMI 0
  
      HDMI Audio Output

  I know that ??? should be something like hw:X,Y, but maybe it can be something else. I can't find the corresponding entry in the man page.

  As an aside, it would be great if you can suggest another audio codec. I can't find what are the options, and this particular one isn't compatible with FLV because of too high bitrate.

  PS. This is the error I'm getting :

  Could not write header for output file #0 (incorrect codec parameters ?): Invalid data found when processing input