用FFmpeg现场直播

Question

如何在python中使用这段代码，请详细指导我是全新的。

ffmpeg \
-f alsa -ac 2 -i hw:1,0 \
-f v4l2 -r 10 -i /dev/video0 \
-c:v libx264 -pix_fmt yuv420p -preset ultrafast -g 20 -b:v 2500k \
-c:a aac -ar 44100 \
-threads 0 -bufsize 512k \
-f flv rtmp://a.rtmp.youtube.com/live2/YOURSTREAM &> stream.log

我试着用侏儒语写

1. 当我刚刚粘贴到编辑器时，它像往常一样给了我错误。
2. 然后，我尝试用os.system()和subprocess.call()这样的方式编写

os.system

os.system(ffmpeg \)
os.system(-f alsa -ac 2 -i hw:1,0 \)
os.system(-f v4l2 -r 10 -i /dev/video0 \)
os.system(-c:v libx264 -pix_fmt yuv420p -preset ultrafast -g 20 -b:v 2500k\)
os.system(-c:a aac -ar 44100 \)
os.system(-threads 0 -bufsize 512k \)
os.system(-f flv rtmp://a.rtmp.youtube.com/live2/YOURSTREAM &> stream.log)

subprocess.call()

subprocess.call(ffmpeg \)
subprocess.call(-f alsa -ac 2 -i hw:1,0 \)
subprocess.call(-f v4l2 -r 10 -i /dev/video0 \)
subprocess.call(-c:v libx264 -pix_fmt yuv420p -preset ultrafast -g 20 -b:v 2500k\)
subprocess.call(-c:a aac -ar 44100 \)
subprocess.call(-threads 0 -bufsize 512k \)
subprocess.call(-f flv rtmp://a.rtmp.youtube.com/live2/YOURSTREAM &> stream.log)

两次都让我犯了错误

'-i' is not recognized as an internal or external command,
operable program or batch file.
'-vcodec' is not recognized as an internal or external command,
operable program or batch file.
'-acodec' is not recognized as an internal or external command,
operable program or batch file.
'-f' is not recognized as an internal or external command,
operable program or batch file.

请指导我，如果有其他方法可以通过python上传视频到youtube上，请告诉我。

Answer 1

您可以尝试将整个ffmpeg命令包装到一个subprocess.call中，将参数分隔为一个列表。

这个(稍微修改过的)命令适用于我将一个剪辑流到我的facebook页面：

subprocess.call(["ffmpeg", "-ac", "2", "-i", "/home/ubuntu/clip.mp4", "-r", "10", "-i", "/home/ubuntu/clip.mp4", "-c:v", "libx264", "-pix_fmt", "yuv420p", "-preset", "ultrafast", "-g", "20", "-b:v", "2500k", "-c:a", "aac", "-ar", "44100", "-threads", "0", "-bufsize", "512k", "-f", "flv", "rtmp://rtmp-api-dev.facebook.com:80/rtmp/10156686554299774?<my stream key>"])