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Autres articles (38)

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  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
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Sur d’autres sites (6161)

  • Evolution #4105 : Constante ou config ?

    28 février 2018, par Maïeul Rouquette

    Ou bien on peut imaginer une convention de nommage des define

    du style PREFIXEDUPLUGIN_CONFIG

    qui du coup irait chercher automatiquement la bonne info. A voir ce qui est le plus simple/pertinent. Il faut aussi prévoir un mécanisme pour faciliter la rédaction des formulaires de config en tenant compte de ce paramètre.

  • 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.

  • FFMPEG providing support for HEVC decoding

    28 novembre 2013, par sam

    FFMPEG v2.1 onwards is providing support for HEVC Decoding. I tried an elementary input bin stream as an input for it and yes i got a corresponding YUV file.

    Now my question is, since i'm just passing an elementary stream as an input, how is the decoder parsing it ?

    I have gone through the /libavformat/hevcdec.c which is supposed to be a demuxer for HEVC.
    I know hevc_probe() is the function in hevcdec.c where it detects if the file can be decoded by the HEVC decoder.

    The definition of hevc_probe() function is given below :

    static int hevc_probe(AVProbeData *p)
    
{
    
    uint32_t code = -1;
    
    int vps = 0, sps = 0, pps = 0, irap = 0;
    
    int i;
    

    
    for (i = 0; i < p->buf_size - 1; i++) {
    
        code = (code << 8) + p->buf[i];
    
        if ((code & 0xffffff00) == 0x100) {
    
            uint8_t nal2 = p->buf[i + 1];
    
            int type = (code & 0x7E) >> 1;
    

    
            if (code & 0x81) // forbidden and reserved zero bits
    
                return 0;
    

    
            if (nal2 & 0xf8) // reserved zero
    
                return 0;
    

    
            switch (type) {
    
            case NAL_VPS:        vps++;  break;
    
            case NAL_SPS:        sps++;  break;
    
            case NAL_PPS:        pps++;  break;
    
            case NAL_BLA_N_LP:
    
            case NAL_BLA_W_LP:
    
            case NAL_BLA_W_RADL:
    
            case NAL_CRA_NUT:
    
            case NAL_IDR_N_LP:
    
            case NAL_IDR_W_RADL: irap++; break;
    
            }
    
        }
    
    }
    

    
    // printf("vps=%d, sps=%d, pps=%d, irap=%d\n", vps, sps, pps, irap);
    

    
    if (vps && sps && pps && irap)
    
        return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
    
    return 0;
    
}

    According to whatever i have read, only if this function returns a constant of type AVPROBE_SCORE_EXTENSION, the decoding will proceed. However it is returning AVPROBE_SCORE_EXTENSION+1 Why is it ?

    Also as seen above in the code, they are deciding some type variable from the input bit code obtained and performing increment in the constants like sps, pps, etc. Is the the normal operation that needs to be performed by a parser which can decode an elementary stream ?

    It would be really helpful to everyone if anyone is able to give a brief of a parser of a decoder that can decode an elementary stream.

    Please Help. Thanks in advance.

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