Am 19.02.2018 um 02:56 schrieb Carl Eugen Hoyos:
2018-02-18 22:56 GMT+01:00 Jonathan Baecker <[email protected]>:
when I use pipe to ffmpeg in combination with *filter_complex
overlay, *I always get the message:
Thread message queue blocking; consider raising the
thread_queue_size option (current value: 256)
What exactly is the problem when FFmpeg shows this message?
Until now I have not seen negative side effects from this message, but
the documentation says that packages can be discarded - that is way I'm
a bit worry about it. And as I say, the message comes only when I use
filter_complex.
You think I can safely ignore the message?
I suspect your command line will always fill the buffer which
hopefully doesn't matter for you (because it isn't entirely
clear why you are using the pipe) but does typically matter.
Yes the buffer will always be filled and that is good. In this example
the pipe makes no sense, right, but normally I loop over a bunch of
files and pipe them through a buffer to ffmpeg.
ffmpeg -v error -hide_banner -nostats -i "input.mp4" -s 1024x576
-pix_fmt yuv420p -c:v rawvideo -c:a pcm_s16le -f avi - | ffmpeg
-thread_queue_size 256 -i pipe:0 -i "logo.png" -filter_complex
overlay -pix_fmt yuv420p -c:v libx264 -crf 26 -preset ultrafast
-c:a aac -f flv -y /dev/null
Please understand that reports with "-hide_banner" are useless
unless you want to report an issue with this option.
Yes you are right, sorry! In a pipe is a bit confusing when both
processes print information, that is why I hide them, but for debugging
is necessary.
Jonathan
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