FFMPEG :Speed Gain libx264 codec Threads

Мне интересно, насколько выигрыш в скорости при использовании нескольких потоков (16), потому что это больше, чем просто выписывание кадров одновременно? Может кто-нибудь дать какую-то информацию?

Спасибо

ffmpeg

— user1767754
источник

I don't know about this specific library, but some tests around the web compare h264 encoding with and without hyperthreading (simplified: twice the threads with more or less half the performance) and it's usually a wash. That means it's pretty close to 2x threads = 2x performance. Things might get more complicated if you want to do realtime encoding.

— Peter

x264 scales pretty linearly. So doubling the thread will double the FPS ( give or take a few percent due to memory speed CPU cache size and locks). But it may increase the final file size (very) slightly. Especially if you use slice based threading.

— szatmary
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As i read per default, it uses just one thread, so would i have 16 times speed gain, when i up it to 16?

— user1767754

You may start loosing efficiency after 8 or so, but it really depends on your CPU, RAM speed, other x264 options, etc.

— szatmary