使用mkfifo和传输流，这可能吗? [英] Working with mkfifo and transport streams, is this possible?
问题描述
我想执行一个bash脚本，该脚本将执行以下操作:
I want to execute a bash script that would do the following:
应用程序'ffmpeg'生成LIVE传输流(.ts)文件.我需要处理此实时条纹(执行多路分解等).
Application 'ffmpeg' generates a LIVE transport stream (.ts) file. I need to work on this live streaam (perform de-multiplexing, etc).
现在我知道这必须通过FIFO完成；但这是我的任务.
Now I know this has to be done via FIFOs; but here is my task.
我需要重定向ffmpeg的输出以写入到fifo，然后另一个应用程序将在该fifo内容上工作.这会持续实时进行，直到我按Ctrl + C为止.
I need to redirect the output of ffmpeg to write to a fifo, and then another application will work on that fifo contents. This happens continuously in real time until I press, say Ctrl+C.
这可能吗?我必须要做的是两个终端吗?
Is this possible? Will I have to do this is two terminals?
我基本上是为上述操作(以及更多操作)编写一个bash脚本，所以我必须调用两个终端，还是分叉?
I'm basically writing a bash script for the above operations (and more) so do I have to invoke two terminals, or maybe fork?
请告知.
提前谢谢！
推荐答案
FFmpeg不支持管道.您要做的所有事情都是这样的:
FFmpeg does support pipes. Everything you have to done is approach as follows:
-
结识朋友
make a fifo
mkfifo first.ts
使用管道运行ffmpeg
run ffmpeg with pipe
ffmpeg -i sample.ts -c copy -muxrate 5000000 pipe:1 > first.ts
运行与传输流文件配合使用的任何其他工具，例如OpenCaster工具tscbrmuxer，可以添加例如NIT表传输流文件
run any other tools which work with transport stream files, e.g. OpenCaster tool tscbrmuxer which can add e.g. NIT table to transport stream file
tscbrmuxer b:3008 NIT.ts b:5000000 first.ts > second.ts
如果要停止使用2个工具，只需杀死最后一个使用pipe/fifo的工具即可.万一您必须杀死tscbrmuxer.
If you want to stop 2 tools simply kill the last one that uses pipe/fifo. in out case you have to kill tscbrmuxer.
kill tscbrmuxer
OR
如果您没有在后台运行最后一个工具，只需使用[ctrl + c]
OR
If you are not running last tool in the background simply kill it with [ctrl+c]
由于使用了这种方法(例如，作为shell脚本或Python)，所有使用管道/fifo的工具都会由于管道损坏而终止.
Thanks to using such an approach (e.g. as a shell script or Python one) all tools that uses pipe/fifo will be terminated due to broken pipe.
我希望这会对您有所帮助.
I hope this will help you.
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