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Recently I wanted to try out the Webm codecs VP8 and VP9 but when I ran ffmpeg
to encode a H.264 MP4 file into one of the other two codecs, I realized that the encoding is (by almost an order of magnitude) slower.
A 1080p30 video from H.264 to VP9 at 3 MBit/s is being encoded at around 6-7 fps while the same video encodes at around 40 fps to H.264. I used the libvpx-vp9
codec in ffmpeg
for the VP9 format. I am getting the same results for VP8 and Theora too.
Can someone explain to me why VP9 is so much slower? I tried a different machine which gave me similar resullts using Handbrake.
https://askubuntu.com/questions/270625/how-to-fast-convert-mp4-to-webm-using-ffmpeg – Ciro Santilli 新疆改造中心法轮功六四事件 – 2019-09-07T16:59:43.593