CODEWITHSUNDEEP
ffmpegvideo-streamingvideo-processing
ohroblot
ohroblot

Reputation: 45

what filters affect ffmpeg encoding speed

What are the options in this command that would cause my encoding speed to be 0.999x instead of 1.0x or higher?

ffmpeg -y \
-loop 1 -framerate 30 -re \
-i ./1280x720.jpg \
-stream_loop -1 -re \
-i ./audio.mp3 \
-vcodec libx264 -pix_fmt yuv420p \
-b:v 2500k -maxrate 2500k -bufsize 10000k \
-preset slow -tune stillimage \
-b:a 128k -ar 44100 -ac 2 -acodec aac \
-af "dynaudnorm=f=150:g=15" \
-g 60 \
-f flv tmp.flv

I am trying to figure out why would this only be encoding at 0.999x speed, is there anything that I could do to speed this up? 2 pass encoding? I cannot understand why the encoding speed is so slow?

Also please not i've tried present from slow - ultrafast, the encoding speed stays relatively unchanged.

Upvotes: 0

Views: 516

Answers (1)

Gyan
Gyan

Reputation: 92998

The -re is the rate-limiting factor. It only feeds input in real-time so the encoder can't progress any faster.

Remove the -re before the inputs. Needed only when trying to simulate a real-time input or streaming to an output that expects its input in real-time.

Upvotes: 1

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