> On 12 Jan 2018, at 13:17, Tobias Rapp <t.r...@noa-archive.com> wrote: > > On 12.01.2018 12:16, Дмитрий Гуменюк wrote: >> Hi >>> On 11 Jan 2018, at 09:20, Tobias Rapp <t.r...@noa-archive.com> wrote: >>> >>> On 10.01.2018 18:18, Kyle Swanson wrote: >>>> Hi, >>>> For this to be a part of libavfilter the output needs to be more generic >>>> than the just the Soundcloud format. If we want this to be generally useful >>>> it should probably just output an array of floats between 0.0 and 1.0. The >>>> consumer of this data (JS library, or whatever) can use this in whatever >>>> way it wants. >>> >>> I agree. If the BWF Peak Envelope output which was suggested in the other >>> thread does not match your demands and filter implementation is actually >>> necessary I would prefer if the filter would attach the RMS value(s) as >>> frame metadata instead of directly dumping to file. Frame metadata can then >>> be re- >> RMS values may be counted for several frames or only for a half of a frame >>> used by other filters or dumped into file by using the existing "ametadata" >>> filter. >>> >>> This would be similar to: >>> >>> ffmpeg -i input-file -f null -filter:a >>> "asetnsamples=22050,astats=metadata=on,ametadata=print:file=stats-file.dat" >>> /dev/null >> I like this idea, but won’t asetnsamples affect performance by creating fifo >> queue? And it may require some effort to parse long output > > I added asetnsamples to define the audio frame size (interval of values from > astats). You can reduce the number of lines printed by ametadata by using the > "key=lavfi.astats.foo" option. I used asetnsamples as well, and I measured performance while transcoding - it appears to be slight slower > > > Regards, > Tobias > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org <mailto:ffmpeg-devel@ffmpeg.org> > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > <http://ffmpeg.org/mailman/listinfo/ffmpeg-devel>
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