#10637: Loudnorm filter returns positive input_i
-------------------------------------+-------------------------------------
Reporter: derkades | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
To use the loudnorm filter in 2-pass mode measured_I, among other values,
needs to be set. This is a value between -99 and 0, according to the
documentation. I believe measured_I should be set to the input_i value
returned by the measurement pass. However, for one specific mp3 file, I
found this value to be greater than 0.
Measurement pass command:
{{{
ffmpeg -hide_banner -i "Don't look back.mp3" -map '0:a' -af
loudnorm=print_format=json -f null -
}}}
Output:
{{{
[Parsed_loudnorm_0 @ 0x7490e00]
{
"input_i" : "26.43",
"input_tp" : "76.06",
"input_lra" : "40.70",
"input_thresh" : "-9.44",
"output_i" : "-23.17",
"output_tp" : "-2.00",
"output_lra" : "6.20",
"output_thresh" : "-33.22",
"normalization_type" : "dynamic",
"target_offset" : "-0.83"
}
}}}
When passed to the filter again, this causes an out of range error:
{{{
[loudnorm @ 0x564632fbe900] Value 26.430000 for parameter 'measured_I' out
of range [-99 - 0]
[loudnorm @ 0x564632fbe900] Error setting option measured_I to value
26.43.
[Parsed_loudnorm_0 @ 0x564632fba400] Error applying options to the filter.
[AVFilterGraph @ 0x564632fad900] Error initializing filter 'loudnorm' with
args
'I=-16:TP=-1.5:LRA=11:measured_I=26.43:measured_TP=76.06:measured_LRA=40.70:measured_thresh=-9.44:offset=-0.83:linear=true'
Error reinitializing filters!
Failed to inject frame into filter network: Numerical result out of range
Error while processing the decoded data for stream #0:0
Conversion failed!
}}}
Using ffmpeg git master 2023-10-06 build from johnvansickle.com
--
Ticket URL: <https://trac.ffmpeg.org/ticket/10637>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker_______________________________________________
FFmpeg-trac mailing list
FFmpeg-trac@avcodec.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-trac
To unsubscribe, visit link above, or email
ffmpeg-trac-requ...@ffmpeg.org with subject "unsubscribe".
