[FFmpeg-devel] [PATCH v5] Improved the performance of 1 decode + N filter graphs and adaptive bitrate.

Michael Niedermayer michaelni at gmx.at
Fri Feb 15 23:21:35 EET 2019

On Fri, Feb 15, 2019 at 04:54:23PM -0500, Shaofei Wang wrote:
> It enabled multiple filter graph concurrency, which bring above about
> 4%~20% improvement in some 1:N scenarios by CPU or GPU acceleration
> Below are some test cases and comparison as reference.
> (Hardware platform: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz)
> (Software: Intel iHD driver - 16.9.00100, CentOS 7)

breaks fate

make -j12 fate-filter-overlay-dvdsub-2397 V=2

frame=  208 fps=0.0 q=-0.0 Lsize=      48kB time=00:00:08.04 bitrate=  49.0kbits/s speed=10.6x    
video:105300kB audio:1254kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
pthread_join failed with error: No such process
Aborted (core dumped)
make: *** [fate-filter-overlay-dvdsub-2397] Error 134

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Asymptotically faster algorithms should always be preferred if you have
asymptotical amounts of data
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