使用 ffmpeg 用 isight 录制视频 [英] record a video with isight using ffmpeg
问题描述
因此，要在 linux 上使用 ffmpeg 录制网络摄像头视频，您可以使用类似...
So to record webcam video with ffmpeg on linux you may use something like...
ffmpeg -f video4linux2 -s 640x480 -i /dev/video0 out.avi
但是在 mac 上这不起作用，所以我想知道你如何在 mac 上使用 ffmpeg 用 isight 进行录制?
But on a mac this doesn't work, so i was wondering how do you record with the isight with ffmpeg on a mac?
我研究过，很多人说它不能完成，但这些帖子中的大多数都非常老，所以我想知道从那以后它是否有所改变.
I've researched and a lot of people said it can't be done, but most of these posts are really old so i'm wondering if it's changed since then.
推荐答案
更新:当前(2014 年 8 月)版本的 ffmpeg 支持 QTKit 和 AVKit 框架:
Updated: current (Aug 2014) version of ffmpeg supports QTKit and AVKit frameworks:
ffmpeg -f qtkit -video_device_index 0 -i "" out.mpg
或
ffmpeg -f qtkit -i "default" out.mpg
您也可以获取可用设备列表:
also you can obtain list of available devices:
ffmpeg -f qtkit -list_devices true -i ""
旧答案:
我用 QuickTime Broadcaster 解决了这个问题.它是一种小型实用程序，可捕获视频和音频，对其进行压缩，将压缩流打包为 rtp 数据包并将其传输到网络.
I solved this problem with QuickTime Broadcaster. It is small utility which captures video and audio, compress it, packetizes compressed stream in rtp packets and transmits them to the network.
所以解决方法非常麻烦，需要双重编码，但它有效:
So the workaround is pretty cumbersome, and requires double encoding but it works:
在 QuickTime Broadcaster 的
Audio和Video标签中设置流
转到Network标签，设置Transmission为Manual Unicast"，Address为127.0.0.1"，端口到类似6000, 6002"的东西
Go to Network tab, set Transmission to "Manual Unicast", Address to "127.0.0.1", Ports to something like "6000, 6002"
文件 ->将广播设置另存为... 到某个文件(例如 Untitled.qtbr)
File -> Save Broadcast Settings As... to some file (e.g. Untitled.qtbr)
导出 SDP 文件:File ->导出 ->SDP.SDP 代表会话描述协议"，其中包含有关在何处查找流、其参数和编解码器选项等的信息.
Export SDP file: File -> Export -> SDP. SDP stands for "Session Description Protocol", that contains information about where to find stream, its parameters and codec options, etc.
现在您可以从命令行启动/停止 QTB:
Now you can start/stop QTB from command line:
osascript -e 'tell application "QuickTime Broadcaster" to start document "Untitled.qtbr"'
osascript -e 'tell application "QuickTime Broadcaster" to stop document "Untitled.qtbr"'
启动 QTB 后，ffmpeg 将能够使用您在第 4 步导出的 sdp 文件读取压缩流(实际上，您可以在 VLC 或 QuickTime 播放器中打开它:open -a vlc stream.sdp).
After you start QTB, ffmpeg will able to read compressed stream using that sdp file you exported on step 4 (actually, you can open it in VLC or QuickTime player: open -a vlc stream.sdp).
因此 QTB 充当捕获代理"，使转换为iSight 到 UDP 套接字".
So QTB works as "capturing agent" which makes conversion "iSight-to-UDP socket".
ffmpeg -i stream.sdp -vcodec mjpeg -an -vf vflip -y /tmp/q.avi
或传送到ffserver:
or transmit it to ffserver:
ffmpeg -i stream.sdp http://localhost:1881/feed1.ffm
(恕我直言)将 iSight 支持添加到 ffmpeg/libavdevice 非常困难.iSight 有基于 ObjC 的 API (QTKit)，它必须封装在 C 静态库中，而且 ffmpeg 必须与所有 OS X 特定框架链接——这是可行的，但需要大量的工作.
(imho) It's pretty hard to add iSight support to ffmpeg/libavdevice. iSight has ObjC-based API (QTKit), which has to be wrapped in C static library, also ffmpeg has to be linked with all OS X specific frameworks - that's doable, but requires quite a lot of work.
这篇关于使用 ffmpeg 用 isight 录制视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
