[FFmpeg-user] Slow conversion when using very low frame rates
dqeswn at gmail.com
Mon Feb 24 12:08:41 CET 2014
Is what I experienced related? I encoded video from a still image with
"-loop 1" and -shortest for an hours long audio with an extremely low
framerate of 0.008 using libx264 with "-tune stillimage". It took some
hours to encode even though it was less then 90 frames in total. (the audio
I just copied)
2014-02-24 8:47 GMT+01:00 Tobias Rapp <t.rapp at noa-audio.com>:
> Carl Eugen Hoyos wrote:
> > > the processing needs still around 80% of the original
> > > processing time even though only about 1% of the frames
> > > are passed through. It seems like FFmpeg is still
> > > reading and decompressing each image before dropping 99%
> > > of the frames.
> > The alternative is theoretically possible (for intra-only
> > codecs which is not known from within ffmpeg.c) but not
> > implemented.
> > Patch welcome!
> OK, will try later to find out how difficult it would be to implement that
> Best regards,
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
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