如何检查电台链接是否有效

比如

https://lhttp.qtfm.cn/live/4915/64k.mp3

这个电台链接，如何检查是否能够正常播放？

或许可以试试

mplayer -endpos 0 http://stream.live.vc.bbcmedia.co.uk/bbc_radio_one
MPlayer 1.4 (Debian), built with gcc-11 (C) 2000-2019 MPlayer Team
do_connect: could not connect to socket
connect: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing http://stream.live.vc.bbcmedia.co.uk/bbc_radio_one.
Resolving stream.live.vc.bbcmedia.co.uk for AF_INET6...

Couldn't resolve name for AF_INET6: stream.live.vc.bbcmedia.co.uk
Resolving stream.live.vc.bbcmedia.co.uk for AF_INET...
Connecting to server stream.live.vc.bbcmedia.co.uk[132.185.210.72]: 80...

Name   : BBC Radio
Public : yes
Bitrate: 128kbit/s
Cache size set to 320 KBytes
Cache fill:  0.00% (0 bytes)   
ICY Info: StreamTitle='BBC Radio 1';
Cache fill: 10.00% (32768 bytes)   

Audio only file format detected.
==========================================================================
Opening audio decoder: [mpg123] MPEG 1.0/2.0/2.5 layers I, II, III
AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000)
Selected audio codec: [mpg123] afm: mpg123 (MPEG 1.0/2.0/2.5 layers I, II, III)
==========================================================================
AO: [pulse] 48000Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A:   0.0 (00.0) of -0.0 (unknown) ??,?% 17% 

Exiting... (End of file)

或许是更好的方法

ffprobe -print_format json -show_streams http://stream.live.vc.bbcmedia.co.uk/bbc_radio_one 2>/dev/null |jq . 
{
  "streams": [
    {
      "index": 0,
      "codec_name": "mp3",
      "codec_long_name": "MP3 (MPEG audio layer 3)",
      "codec_type": "audio",
      "codec_tag_string": "[0][0][0][0]",
      "codec_tag": "0x0000",
      "sample_fmt": "fltp",
      "sample_rate": "48000",
      "channels": 2,
      "channel_layout": "stereo",
      "bits_per_sample": 0,
      "r_frame_rate": "0/0",
      "avg_frame_rate": "0/0",
      "time_base": "1/14112000",
      "start_pts": 0,
      "start_time": "0.000000",
      "bit_rate": "128000",
      "disposition": {
        "default": 0,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0
      }
    }
  ]
}

用 -show_format，可以取到 比特率 信息，tags 里有电台流的 metadata。

    $sCMD = "ffprobe -v quiet -print_format json -show_format -i " . $sUrl;
    exec($sCMD, $sOutput, $iResult);
    $sOutput = implode("",$sOutput);
    $aOutput = json_decode($sOutput, true);