[FFmpeg-devel] [PATCH] add dumpwave filter

Дмитрий Гуменюк dmitry.gumenyuk at gmail.com
Sat Jan 13 02:37:57 EET 2018


> On 12 Jan 2018, at 13:32, Дмитрий Гуменюк <dmitry.gumenyuk at gmail.com> wrote:
>> On 12 Jan 2018, at 13:17, Tobias Rapp <t.rapp at noa-archive.com <mailto:t.rapp at noa-archive.com>> wrote:
>> On 12.01.2018 12:16, Дмитрий Гуменюк wrote:
>>> Hi
>>>> On 11 Jan 2018, at 09:20, Tobias Rapp <t.rapp at noa-archive.com <mailto:t.rapp at 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
I think output is now more generic and I got rid of long switch/case, thanks for support 

>> Regards,
>> Tobias
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