5

编辑
我停止使用 VLC 并切换到GMax FLV Encoder。它在 IMO 上做得更好。

原始帖子
我将我的桌面（屏幕）作为 H264 视频流发送到另一台机器，该机器使用以下命令行将其保存到文件中：

流的发送者：

vlc -I dummy
    --sout='#transcode{vcodec=h264,vb=512,scale=0.5}
            :rtp{mux=ts,dst=192.168.0.1,port=4444}'

流的接收者：

vlc -I rc
    rtp://@:4444
    --sout='#std{access=file,mux=ps,dst=/home/user/output.mp4}'
    --ipv4

这可行，但有几个问题：

  • 大多数播放器无法播放该文件。
  • VLC 能够播放文件，但有些奇怪：
  • => 播放实际开始前大约需要 10 秒。
  • => 寻求不起作用。

有人可以为我指出如何解决这些问题的正确方向吗？

编辑：我取得了一点进展。

播放的初始延迟是因为播放器正在等待关键帧。通过强制流的发送者每 4 秒创建一个新的关键帧，我可以减少延迟：

:screen-fps=10
--sout='#transcode{vcodec=h264,venc=x264{keyint=40},vb=512,scale=0.5}
       :rtp{mux=ts,dst=192.168.0.1,port=4444}'

然而，寻求问题并没有解决，但我对它的理解要好一些。RTP 流以其原始流格式保存为文件，通常不能作为常规视频文件播放。VLC 设法播放此文件，但大多数其他播放器没有。所以我需要把它转换成一个普通的视频文件。我目前正在调查是否可以使用 ffmpeg 执行此操作，如果我向它提供记录流的 SDP 文件。

欢迎所有帮助！

4

2 回答 2

6

使用以下命令更新您的发件人命令行：

venc=x264{scenecut=20,bframes=0}

您的客户端命令行为：

vlc -I rc rtp://@:4444 --sout='#std{access=file,mux=mp4,dst=/tmp/output.mp4}' --ipv4

应该解决你的问题。你测试了哪些球员？

于 2009-11-21T22:34:24.447 回答
0

发件人：

$ vlc screen:// :screen-fps=5 :screen-caching=100 --sout='#transcode{vcodec=h264,venc=x264{scenecut=20,bframes=0},vb=512,scale=0.5}:rtp{mux=ts,dst=127.0.0.1,port=1234}'
VLC media player 1.1.11 The Luggage (revision exported)
Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
[0x9caf8fc] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
Blocked: call to setlocale(6, "")
Warning: call to srand(1314435080)
Warning: call to rand()
Blocked: call to setlocale(6, "")

(process:11597): Gtk-WARNING **: Locale not supported by C library.
    Using the fallback 'C' locale.
x264 [info]: using cpu capabilities: MMX2 Cache64
x264 [info]: profile High, level 3.2
x264 [info]: using SAR=1/1
x264 [info]: using cpu capabilities: MMX2 Cache64
x264 [info]: profile High, level 4.0
x264 [info]: frame I:1     Avg QP:16.44  size: 57235
x264 [info]: frame P:152   Avg QP:10.01  size:  2747
x264 [info]: mb I  I16..4: 33.8%  2.7% 63.5%
x264 [info]: mb P  I16..4:  0.9%  0.0%  0.9%  P16..4:  2.1%  0.4%  0.3%  0.0%  0.0%    skip:95.4%
x264 [info]: 8x8 transform intra:1.8% inter:44.3%
x264 [info]: coded y,uvDC,uvAC intra: 45.5% 42.9% 40.5% inter: 1.5% 1.5% 1.4%
x264 [info]: i16 v,h,dc,p: 45% 54%  0%  0%
x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 41% 22%  2%  2%  2%  4%  1%  3%
x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 49% 13%  2%  3%  3%  5%  2%  7%
x264 [info]: i8c dc,h,v,p: 43% 49%  7%  2%
x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
x264 [info]: ref P L0: 85.8%  4.5%  9.1%  0.7%
x264 [info]: kb/s:124.12
^C[0x9d4ee6c] signals interface error: Caught Interrupt signal, exiting...

接收者：

$ vlc udp://:1234
VLC media player 1.1.11 The Luggage (revision exported)
Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
[0x8c728fc] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
Blocked: call to setlocale(6, "")
Warning: call to srand(1314469032)
Warning: call to rand()
Blocked: call to setlocale(6, "")

(process:11707): Gtk-WARNING **: Locale not supported by C library.
    Using the fallback 'C' locale.
libdvbpsi error (PSI decoder): TS discontinuity (received 1, expected 0) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 1, expected 0) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 6, expected 5) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 8, expected 7) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 10, expected 9) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 14, expected 13) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 0, expected 15) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 1) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 12, expected 11) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 14, expected 13) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 0, expected 15) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 2, expected 1) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 7, expected 6) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 9, expected 8) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 11, expected 10) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 13, expected 12) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 15, expected 14) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 1, expected 0) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 8, expected 7) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 11, expected 10) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 13, expected 12) for PID 66
libdvbpsi error (PSI decoder): TS discontinuity (received 4, expected 3) for PID 0
libdvbpsi error (PSI decoder): TS discontinuity (received 8, expected 7) for PID 66
[0xb740070c] main input error: ES_OUT_SET_(GROUP_)PCR  is called too late (pts_delay increased to 300 ms)
^C[0x8d11cec] signals interface error: Caught Interrupt signal, exiting...
于 2011-08-27T23:28:24.987 回答