使用 FFMPEG 下载 HLS 视频时，它不会下载音频

Posted 2023-02-25

【中文标题】使用 FFMPEG 下载 HLS 视频时，它不会下载音频

【英文标题】：When downloading HLS video with FFMPEG it does not download the audio

【发布时间】：2021-08-03 00:10:24

【问题描述】：

我有一个问题，当我尝试使用 FFMPEG 下载 HLS 视频时，它会下载视频轨道，但找不到 AUDIO。在播放器中运行 HLS .m3u8 文件时，正常播放，音频和视频，但尝试下载时，显示错误消息，提示找不到音频。

我正在运行以下命令：

ffmpeg.exe -i "https://teste-etv.espiritismo.tv/437602.m3u8" -codec:a libmp3lame -b:a 96k teste-hls.mp3

尝试下载音频时显示以下错误：

[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-INDEPENDENT-SEGMENTS')
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-1080p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[https @ 0000021b5e10ee00] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-720p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[https @ 0000021b5e10ee00] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-540p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[https @ 0000021b5e10ee00] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-360p.m3u8' for reading
[hls @ 0000021b5d9ad940] Skip ('#EXT-X-VERSION:3')
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-1080p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-1080p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-720p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-720p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-540p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-540p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-360p_00001.ts' for reading
[hls @ 0000021b5d9ad940] Opening 'https://appsetv.b-cdn.net/hls/437602/437602-360p_00002.ts' for reading
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 1 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 3 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 5 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[hls @ 0000021b5d9ad940] Could not find codec parameters for stream 7 (Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp): unspecified sample rate
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, hls, from 'https://appsetv.b-cdn.net/hls/437602/437602.m3u8':
  Duration: 00:01:41.00, start: 2.083333, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 2509173
    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 2509173
    Stream #0:1: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 2509173
  Program 1
    Metadata:
      variant_bitrate : 1205957
    Stream #0:2: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 1205957
    Stream #0:3: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 1205957
  Program 2
    Metadata:
      variant_bitrate : 1165600
    Stream #0:4: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 1165600
    Stream #0:5: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 1165600
  Program 3
    Metadata:
      variant_bitrate : 656245
    Stream #0:6: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 656245
    Stream #0:7: Audio: aac ([15][0][0][0] / 0x000F), 0 channels, fltp
    Metadata:
      variant_bitrate : 656245
Output #0, mp3, to 'teste-hls.mp3':
Output file #0 does not contain any stream

【参考方案1】：

问题可以通过两种方式解决：

添加-map来映射音轨或添加参数-analyzeduration 5G（该命令增加了检查文件中ffmpeg的时间。）

例子：

-地图 0:1

ffmpeg -i https://teste-etv.espiritismo.tv/437602-1080p.m3u8 -map 0:1 -codec:a libmp3lame -b:a 96k teste-hls.mp3

或

-analyzeduration 5G

ffmpeg.exe -analyzeduration 5G -i https://teste-etv.espiritismo.tv/437602.m3u8 -codec:a libmp3lame -b:a 96k teste-hls-3.mp3

** 解决方案是通过邮件列表上的 ffmpeg 用户论坛的贡献找到的。