ffmpeg 和 ffserver，rc 缓冲区下溢？

Question

我正在尝试为一个项目编写一个简单的流服务器。我有一台将运行的 AWS Linux 机器 ffserver .目前，就目前而言，我的配置文件如下所示:

#Server Configs
HTTPPort 8090
HTTPBindAddress 0.0.0.0
MaxHTTPConnections 2000
MaxClients 1000
MaxBandwidth 1000
CustomLog -

#Create a Status Page
<Stream stat.html>
Format status
ACL allow localhost
ACL allow 255.255.255.255 #Allow everyone to view status, for now
</Stream>

#Creates feed, only allow from self
<Feed feed1.ffm>
File /tmp/feed1.ffm
FileMaxSize 50M
ACL allow 127.0.0.1
ACL allow <MY_PERSONAL_COMPUTER'S_PUBLIC_IP_HERE>
</Feed>

#Creates stream, allow everyone
<Stream tagLive.mpg>
Format mpeg
Feed feed1.ffm
VideoFrameRate 30
VideoSize 640x480
AudioSampleRate 44100
</Stream>

然后我正在捕获我的网络摄像头并使用以下命令将其发送到服务器:

ffmpeg -f dshow 
       -i video="Webcam C170":audio="Microphone (Webcam C170)" 
       -b:v 1400k  
       -maxrate 2400k  
       -bufsize 1200k  
       -ab 64k  
       -s 640x480  
       -ac 1  
       -ar 44100  
       -y http://<AWS_SERVER_PUBLIC_DNS>:8090/feed1.ffm

但是，当我运行它时，我会从控制台获得以下输出:

Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, dshow, from 'video=Webcam C170:audio=Microphone (Webcam C170)':
  Duration: N/A, start: 12547.408000, bitrate: N/A
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 tbr, 10000k tbn, 30 tbc
    Stream #0:1: Audio: pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
Output #0, ffm, to '<AWS_SERVER_PUBLIC_DNS>:8090/feed1.ffm':
  Metadata:
    creation_time   : 2017-04-26 14:55:27
    encoder         : Lavf57.25.100
    Stream #0:0: Audio: mp2, 44100 Hz, mono, s16, 64 kb/s
    Metadata:
      encoder         : Lavc57.24.102 mp2
    Stream #0:1: Video: mpeg1video, yuv420p, 640x480, q=2-31, 64 kb/s, 30 fps, 1000k tbn, 30 tbc
    Metadata:
      encoder         : Lavc57.24.102 mpeg1video
    Side data:
      unknown side data type 10 (24 bytes)
Stream mapping:
  Stream #0:1 -> #0:0 (pcm_s16le (native) -> mp2 (native))
  Stream #0:0 -> #0:1 (rawvideo (native) -> mpeg1video (native))
Press [q] to stop, [?] for help
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflowtime=00:00:01.13 bitrate= 404.8kbits/s dup=13 drop=0 speed=2.22x
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflowtime=00:00:01.63 bitrate= 361.1kbits/s dup=13 drop=0 speed=1.61x
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflowtime=00:00:02.13 bitrate= 368.6kbits/s dup=13 drop=0 speed= 1.4x
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflowtime=00:00:02.66 bitrate= 344.1kbits/s dup=13 drop=0 speed=1.32x
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflowtime=00:00:03.16 bitrate= 331.1kbits/s dup=13 drop=0 speed=1.25x
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
[mpeg1video @ 02e95180] rc buffer underflow
[mpeg1video @ 02e95180] max bitrate possibly too small or try trellis with large lmax or increase qmax
frame=  117 fps= 36 q=31.0 Lsize=     156kB time=00:00:03.86 bitrate= 330.5kbits/s dup=13 drop=0 speed= 1.2x
video:118kB audio:27kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 7.659440%
Exiting normally, received signal 2.

在我的查看器上，我只是得到一个黑屏。

有什么我想念的吗？搜索不会导致“增加 qmax”或任何类似于 ffmpeg 的内容提示。有问题问 here ，但什么都没有做/回答。

提前致谢

Answer 1

您可以在服务器配置中设置 qmax 和 qmin

<Stream test_3840.flv>
...
VideoQMin 1
VideoQMax 15
...
</Stream>

更多详细信息可以在该答案中找到 https://stackoverflow.com/a/18566361/4010173