Ubuntu ffmpeg can't use libx264

Question

Command

ffprobe rtsp://localhost/myvideo -codec:v libx264 -show_frames -of csv

Output

Failed to set value 'libx264' for option 'codec:v': Option not found

But libx264 seems to be installed - sudo apt install libx264-dev:

Reading package lists... Done Building dependency tree Reading state information... Done libx264-dev is already the newest version (2:0.152.2854+gite9a5903-2).

Gyan · Accepted Answer · 2021-05-27 15:38:06Z

1

libx264 is an encoder. ffprobe only probes and prints information about existing media inputs - there's no scope for an encoder to be specified. Remove -codec:v libx264.

answered May 27, 2021 at 15:38

Gyan

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3 Comments

user1315621 Over a year ago

Thanks. Question: is there a way, using a decoder, to ask the encoder to use a certain "amount" of B or P frames? Or is it completely up to the encoder? I am streaming an rtsp video.

Gyan Over a year ago

No. You have to tweak whichever software or device is running the encoder.

user1315621 Over a year ago

Oh, I though rtsp would allow to ask the encoder (on the other side of the network) to encode with different number of B-frames and P-frames

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