[FFmpeg-user] Alternative to Dynamic Text
cus at passwd.hu
Sun Nov 7 11:26:03 EET 2021
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 <tanlccc at 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
>> can help you to find the answer (and maybe somehow "debug" the
> 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
> 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.
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