Comments (5)
I think there are two issues at play here:
-
An apparently broken algorithm that is not fixed upstream (which seems to be worked on in some fork of FFmpeg, so it seems like that should be merged back into FFmpeg itself).
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Usage notes that would help prevent issues from an end-user perspective.
What are you suggesting specifically? If "Going higher (> -14 LUFS) than source LUFS is forcing dynamic processing" (per the comment thread) then there could be a warning that dynamic mode is being used.
There is a warning already affecting the loudness range:
ffmpeg-normalize/ffmpeg_normalize/_streams.py
Lines 426 to 438 in 94c2c6a
Are you suggesting something akin to this?
from ffmpeg-normalize.
What are you suggesting specifically?
"show warning when using non-default target level"
if cli_args.target_level < -23:
print(f"warning: using non-default target level {cli_args.target_level}. this can produce volume glitches. please verify the result.")
from ffmpeg-normalize.
I find this a bit too drastical. In your original issue you talked about increasing the target beyond the input loudness. I can imagine adding a warning for that.
from ffmpeg-normalize.
I did some checks on some files and it seems like the filter does not always revert to dynamic mode when the target is higher than the existing target. Instead, I'll parse the second pass loudnorm output and check if it shows that dynamic mode was used, compare that with the user's intent (i.e., if they wanted linear mode), and if there's a mismatch, print a warning.
from ffmpeg-normalize.
Fixed in v1.28.0, see #256
from ffmpeg-normalize.
Related Issues (20)
- Different audio_bitrate for different surround/stereo sound streams HOT 13
- Surround sound 5.1 is (merged to?) stereo HOT 8
- chmod: /usr/local/bin/ffprobe: No such file or directory HOT 2
- When running on a folder of mp3s, nearly all of them report loudness range larger than the loudness range target HOT 1
- Normalize entire music library at same volume HOT 2
- Reverting to dynamic normalization regardless of the command I try HOT 6
- Cover no longer added HOT 3
- Help normalizing MP3 files HOT 3
- Specify output folder and create one if doesn't exist HOT 2
- Add possible to select stream to normalize HOT 1
- Error When Using an Apostrophe ior Ampersand in Pathname HOT 5
- dynamic mode: Change in integrated loudness shouldn’t result in a true peak which exceeds the target TP HOT 12
- Loudness normalization for files with very low sound HOT 3
- Combining ffmpeg-normalize with ffmpeg pan filer HOT 6
- List index out of range when running normalization HOT 3
- Can't find ffmpeg.exe with ffmpeg_path set HOT 3
- lrt doesn't work and Error opening output file HOT 1
- Docker Hub Image HOT 4
- Guidance for tuning for audiobooks HOT 12
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from ffmpeg-normalize.