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Old 07-30-2020, 04:12 AM   #1
Pablo Sound
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Default Higher volume when rendering to MOV than to WAV (SOLVED)

I've rendered the same piece of audio (which is a video too) to WAV and then to a video file (MOV) with Reaper. I added both of the rendered files to the project I was working on to compare them, and I could already notice at first sight that the audio wave in the video was higher than the WAV one. Then I analyzed them with the SWS Loudness extension and the results were much different. Why does this happen? I'll put below the rendering details and the results in the SWS Loudness extension for each file.

WAV render
-Format: WAV
-Sample rate: 48 kHz
-Bit depth: 24 bit PCM
-Estereo
-Full-speed offline

MOV render
-Format: Video (ffmpeg/libav encoder)
-Format: QT/MOV/MP4
-Size: 1920x1080
-Framerate: 24 FPS
-Sample rate: 48 kHz
-Video codec: MPEG 95%
-Audio codec: 24 bit PCM

WAV loudness
-Integrated: -23.3 LUFS
-Range: -14.8 LU
-True peak: -6.0 dBTP
-Maximum short-term: -20.5 LUFS
-Maximum momentary: -17.1 LUFS

MOV loudness
-Integrated: -17.3 LUFS
-Range: -14.8 LU
-True peak: 0.0 dBTP
-Maximum short-term: -14.5 LUFS
-Maximum momentary: -11.1 LUFS

It seems everything jumps 6 LUFS/dB in the MOV file compared to the WAV.
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Old 07-30-2020, 07:28 AM   #2
dougdi
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Since the TP is now 0, perhaps the file has been normalized to 0 peak?
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Old 08-13-2020, 03:42 AM   #3
Pablo Sound
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I just discovered what was wrong. When I rendered to WAV, I added the file to the project but didn't mute it, so when I then rendered to MOV i was rendering the file twice (+6dB = in phase). Big mistake of mine.
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Old 08-13-2020, 05:54 AM   #4
dougdi
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Glad you found it!
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Old 08-15-2020, 07:34 AM   #5
vdubreeze
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Quote:
Originally Posted by Pablo Sound View Post
I just discovered what was wrong. When I rendered to WAV, I added the file to the project but didn't mute it, so when I then rendered to MOV i was rendering the file twice (+6dB = in phase). Big mistake of mine.
Been there
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