【发布时间】：2019-03-27 12:05:26
【问题描述】：
我正在使用 ffmpeg 在应用程序中播放 RTSP 流。我遇到了一个问题，一旦到达 RTSP 流的末尾，我就无法再看到流中的任何位置。
我正在编写的程序使用 LGPL 共享库，但使用 GPL 版本的 ffplay 可以看到相同的行为。
ffplay.exe "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov"
在播放视频时，我可以使用 ffplay 的键盘快捷键（左/右箭头键）向前或向后搜索。一旦流到达末尾，就不可能了，并且流被暂停或播放，搜索不再起作用。我在共享库中看到错误，但在 ffplay 中，除非我使用 s 键（这可能是我无法寻找的意义），否则我看不到错误。在其他流中，我看到了流长于报告长度的问题，并且一旦缓冲/下载了额外的视频，就无法搜索。关于这里发生了什么的任何指导？
使用ffplay.exe（也使用较新的版本进行验证）：
C:\Users\kealist\Downloads\ffmpeg-20180526-63c4a4b-win64-static\bin>ffplay "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov"
ffplay version N-91158-g63c4a4b0d6 Copyright (c) 2003-2018 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
libavutil 56. 18.102 / 56. 18.102
libavcodec 58. 19.104 / 58. 19.104
libavformat 58. 17.100 / 58. 17.100
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 24.100 / 7. 24.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
[udp @ 0000023ce71807c0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0000023ce7174ac0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0000023ce71a6f40] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[udp @ 0000023ce7174bc0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
[rtsp @ 0000023ce717d900] UDP timeout, retrying with TCP 0B f=0/0
Input #0, rtsp, from 'rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov':
Metadata:
title : BigBuckBunny_115k.mov
Duration: 00:09:56.48, start: 0.000000, bitrate: N/A
Stream #0:0: Audio: aac (LC), 12000 Hz, stereo, fltp
Stream #0:1: Video: h264 (Constrained Baseline), yuv420p(progressive), 240x160, 24 fps, 24 tbr, 90k tbn, 48 tbc
rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov: error while seeking
rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov: error while seeking
596.27 A-V:-32.424 fd=1290 aq= 0KB vq= 0KB sq= 0B f=1/1
-v trace 可以看到有一条 Seek 消息，但无论是暂停还是播放，都没有真正发生搜索。
video: delay=0.000 A-V=0.173265
Seek to 37% ( 0:03:38) of total duration ( 0:09:56) B f=1/1
Seek to 83% ( 0:08:14) of total duration ( 0:09:56) B f=1/1
Seek to 57% ( 0:05:42) of total duration ( 0:09:56) B f=1/1
Seek to 78% ( 0:07:41) of total duration ( 0:09:56) B f=1/1
Seek to 85% ( 0:08:24) of total duration ( 0:09:56) B f=1/1
Seek to 92% ( 0:09:06) of total duration ( 0:09:56) B f=1/1
Last message repeated 1 times
Seek to 92% ( 0:09:08) of total duration ( 0:09:56) B f=1/1
Last message repeated 1 times
597.08 A-V:-34.561 fd= 312 aq= 0KB vq= 0KB sq= 0B f=1/1
有没有办法在不重新加载流的情况下缓解这种情况？
【问题讨论】：