I'm using libavcodec to perform decoding of H.264 frames. I'm on a Linux
environment (14.04 Xubuntu), and Intel Haswell (Pentium grade) CPU. My program
decodes the frames, without rendering them on the screen. With 4 simultaneous
decodes of 1080p resolution and 15 fps, the CPU utilization is around 90% (not
bad), but the load average shown by 'top' is 20+ This looks excessive. I don't
think I'm using the hardware decoding ability of the Haswell CPU. Could someone
please advise how to find out if I'm effectively using the decoder? The API
calls I'm making are pretty standard -
avcodec_register_all(); avcodec_alloc_context3(NULL);
avcodec_find_decoder(AV_CODEC_ID_H264); av_parser_init(AV_CODEC_ID_H264);
avcodec_open2(); The above calls are made during initialization. The below
calls are made on each frame - av_parser_parse2 avcodec_decode_video2 The
following points are probably relevant -
a) The default context allocated by avcodec_alloc_context3() does not have any
hw_accel associated with it. I allocated a h264_vaapi accelerator, but this
doesn't lead to any improvement.
b) The codec capabilities does not have the HW_ACCEL bit set.
c) The same code worked better when used with Ubuntu 11.10 on a Sandybridge
Pentium grade CPU and FFMPEG 0.9
Any help would be appreciated.
Thanks,
Prashanth
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