[FFmpeg-user] Re-writing hot .ts file that rotates every 24 hours in realtime

[Carl Zwanzig]

On 2/15/2021 11:33 PM, Korn Moffle wrote:
> What I am trying to do:
> a. copy the file in realtime ? So, ffmpeg would be rewriting file1.ts into file2.ts as file1.ts is constantly being written into.

What's the goal of that?

> b. tell ffmpeg to read the file with a constant 3 second delay from the most updated frame?

...to add a 3 second delay?

If it's a real mpeg-ts stream, you could simply skip ffmpeg and as 
bytes/blocks are written to one file*, read/buffer for 3 seconds/write out 
to other file. You'll, of course, need a long enough circular buffer to hold 
that much stream.

*watch that with select(), poll(), or the windoze equivalent


> c. if a new file appears, detect it and switch to it?

Also, do this with your program. Be careful of the boundary conditions when 
starting and when switching files; if nothing else, you're probably not 
guaranteed that the new file will start on a new frame; depends on the 
writer. Fortunately, transport streams are designed to be somewhat resilient 
to interruptions.

Later,

z!