On Sun, 7 Nov 2021, Gyan Doshi wrote:
On 2021-11-07 03:58 am, Anatoly wrote:
On Thu, 4 Nov 2021 20:14:16 +0800
LianCheng <tanl...@gmail.com> wrote:
Yes, would like to know in ffmpeg, under drawtext, the textfile
(reload=1) is using read-write or read-only mode?
I think "procmon.exe" from Microsoft
https://docs.microsoft.com/en-us/sysinternals/downloads/procmon
can help you to find the answer (and maybe somehow "debug" the
situation).
FFmpeg opens the file with O_RDONLY mode.
Btw, I think following approach may help (or may not, I have no windows
system by hand to test it myself). Let's say I want to atomically
replace file a.txt with file b.txt
mklink /h wrk.txt a.txt
open wrk.txt with ffmpeg
update b.txt as needed
mklink /h next.txt b.txt
move /y next.txt wrk.txt
now update a.txt as needed or may delete a, b and create new b.
hardlink again and move again
and so on in loop
This can work until it doesn't. The filter doesn't tolerate any load
failures.
I'll see if I can add a short sleep and retry. If it still fails, we continue
with the old text.
I am not a fan of this to be honest. There is a proper way to do atomic
renames even in windows, see the referenced stackoverflow articles, so it
should just work.
Regards,
Marton
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