Question

我正在尝试使用ffmpeg工具（ffprobe和ffplay）获取Microsoft Smooth Streaming协议流的详细信息，但是当我运行下一个命令时：

ffprobe -i http://b31282.cdn.telefonica.com/31282/Manifest

我得到了这个：

http://b31282.cdn.telefonica.com/31282/Manifest: Invalid data found when processing input

我认为这个Manifest文件是正确的，并且符合Smooth Streaming的标准。这是Manifest文件的简要摘录：

<SmoothStreamingMedia MajorVersion="2" MinorVersion="0" Duration="0" TimeScale="10000000" IsLive="TRUE" LookAheadFragmentCount="2" DVRWindowLength="6000000000" CanSeek="TRUE" CanPause="TRUE">
  <Protection>
    <ProtectionHeader SystemID="9a04f079-9840-4286-ab92-e65be0885f95">oioAAAIAAQCUAjwAV...</ProtectionHeader>
  </Protection>
  <StreamIndex Type="audio" Name="audio_esp" Language="esp" Subtype="" Chunks="0" TimeScale="10000000" Url="QualityLevels({bitrate})/Fragments(audio_esp={start time})"></StreamIndex>
  <StreamIndex Type="video" Name="video" Language="" Subtype="" Chunks="0" TimeScale="10000000" Url="QualityLevels({bitrate})/Fragments(video={start time})"></StreamIndex>
</SmoothStreamingMedia>

Fedora 21和ffmpeg的版本和配置是：

ffmpeg version git-2015-02-27-d490b26
configuration: --enable-gpl --enable-nonfree --enable-libfdk_aac --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264
libavutil         54. 19.100         
libavcodec        56. 26.100          
libavformat       56. 23.105           
libavdevice       56.  4.100                   
libavfilter        5. 11.102          
libswscale         3.  1.101        
libswresample      1.  1.100           
libpostproc       53.  3.100

PD ：我更喜欢只使用ffmpeg工具

PD2 ：与Microsoft Smooth Streaming Manifest文件相同：

ffmpeg -i http://mediadl.microsoft.com/mediadl/iisnet/smoothmedia/Experience/BigBuckBunny_720p.ism/Manifest
Invalid data found when processing input

全部谢谢

Answer 1

不支持平滑流多路分配。

这里是official doc，在多路复用器部分中不会显示平滑流。这是当您询问支持哪些类型时的输出

chang@p300a:~/git-root/FFmpeg$ ffmpeg -formats|grep smooth
ffmpeg version n4.2.3-3-gbf7ed52c25 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --enable-libv4l2 --enable-zlib --enable-vaapi --enable-pthreads --enable-vdpau --enable-xlib --enable-libv4l2 --enable-libx264 --enable-gpl --enable-gnutls --enable-openssl --enable-nonfree --disable-gnutls --enable-libxml2 --enable-libdrm
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
  E smoothstreaming Smooth Streaming Muxer

无法从Smooth Streaming Manifest文件中使用ffmpeg获取信息

1 个答案: