[英]Streaming webm with ffmpeg/ffserver
I'm attempting to cast my desktop screen to an ffserver and stream it as a webm. 我正在尝试将桌面屏幕投射到ffserver并将其作为webm流式传输。 I'm using the following ffserver configuration:
我正在使用以下ffserver配置:
<Feed feed1.ffm> # This is the input feed where FFmpeg will send
File ./feed1.ffm # video stream.
FileMaxSize 1G # Maximum file size for buffering video
ACL allow 127.0.0.1
ACL allow localhost
</Feed>
<Stream test.webm> # Output stream URL definition
Feed feed1.ffm # Feed from which to receive video
Format webm
# Audio settings
AudioCodec vorbis
AudioBitRate 64 # Audio bitrate
# Video settings
VideoCodec libvpx
VideoSize 720x576 # Video resolution
VideoFrameRate 25 # Video FPS
AVOptionVideo cpu-used 10
AVOptionVideo qmin 10
AVOptionVideo qmax 42
AVOptionVideo quality good
AVOptionAudio flags +global_header
PreRoll 15
StartSendOnKey
VideoBitRate 400 # Video bitrate
</Stream>
And the following command on my desktop: 然后在我的桌面上执行以下命令:
ffmpeg -f x11grab -r 25 -s 1280x800 -i :0.0 -f alsa -i pulse http://127.0.0.1:8090/feed1.ffm
With ffmpeg being version 2.4.2 and with libvpx enabled (latest on Arch). ffmpeg版本为2.4.2,并且启用了libvpx(Arch上的最新版本)。 I get the error:
我得到错误:
[libvpx @ 0x20a21a0] CQ level 0 must be between minimum and maximum quantizer value (10-42)
On the client side. 在客户端。 As far as I can tell from calling
ffmpeg -h full
there's no way of setting the cq-level, and setting qmin to 0 doesn't work (it ends up as 3 for some reason, I guess ffmpeg enforces a minimum). 据我从调用
ffmpeg -h full
知道的,无法设置cq级别,并且将qmin设置为0不起作用(由于某种原因,它最终变为3,我猜ffmpeg强制执行最小值)。
This configuration seems to have worked for others on the internet, but I can't see how if cq-level defaults 0. If anyone has any ideas I'd really appreciate it. 此配置似乎已经对Internet上的其他用户起作用,但是我看不出cq级别的默认值如何为0。如果有人有任何想法,我将非常感谢。
Add -c:v libvpx
to your console syntax: 将
-c:v libvpx
添加到您的控制台语法中:
ffmpeg -f x11grab -r 25 -s 1280x800 -i :0.0 -c:v libvpx -f alsa -i pulse http://127.0.0.1:8090/feed1.ffm
Also I'd recommend reading the ffmpeg streaming guide 另外,我建议阅读ffmpeg流媒体指南
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