FFMPEG:如何从所有流中选择一个流

Question

我尝试转换 UDP 流(从 DVB 信号生成)到 HLS m3u8 文件，代码如下:

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 流包含 1 个 channel (在本例中为 IRIB-TV1)。

当我运行上面的代码时， ffmpeg 使用此消息检测从 DVB 卡流式传输的所有服务和 channel :

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

正如您在 UDP 流中看到的 ffmpeg finf 4 channel ，但 VLC 仅播放 channel 1(IRIB-TV1)。

现在我有两个问题:

1-我可以通过这个 获得所有 channel 和服务吗？ ffmpeg 代码？

2-我可以从这个 中选择一个特殊的流吗？ ffmpeg 代码？(我知道 ffmpeg 可以选择带有 -map 选项的流，但我想选择输出日志中的其他服务名称)

输出文件为 :

 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.

Answer 1

根据 docs 的语法(例 8)是

ffmpeg -i udp://239.1.2.1:60001 -map 0:p:102 -acodec aac -strict -2 -vcodec libx264 -hls_wrap 100 -f hls /var/www/html/ts/1.m3u8 

但我没有看到为 101 之后的程序声明的任何流，因此请检查它们是否可用。