Unsigned Big PCM

[Mads Nybo jørgensen]

Hey Eddie,

Sorry, but you need to give a bit more context, as ProRes is normally a codec only used for video and audio together.

What do you have in your timeline, and what is it that you need to deliver?

PCM audio like video can sit inside a number of different types of file “containers”, although it may involve a “conversion” to a lower quality format.

Atb
Mads

[Eddie Valentin]

I attached .txt of a .mov with pcm linear video I rendered with and view media info. please check under audio. Why in format settings its little/signed? Please help me change format settings to unsigned big pcm audio to me I’ve noticed that unsigned big pcm or sounds louder.

The-National.mov_MediaInfo.txt 4 KB Text File - Click to view

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General Complete name : The National.mov Format : MPEG-4 Format profile : QuickTime Codec ID : qt 0000.00 (qt ) File size : 21.0 GiB Duration : 4 min 54 s Overall bit rate : 612 Mb/s Frame rate : 60.000 FPS Title : The National Description : This video is about The National Encoded date : 2025-11-14 05:11:59 UTC Tagged date : 2025-11-14 05:14:03 UTC Writing library : Apple Apple QuickTime / QuickTime com.apple.quicktime.keywords : The National com.apple.quicktime.author : Eddie Valentin com.apple.quicktime.title : The National Video ID : 2 Format : ProRes Format version : Version 0 Format profile : 422 Codec ID : apcn Duration : 4 min 54 s Bit rate mode : Constant Bit rate : 608 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 60.000 FPS Color space : YUV Chroma subsampling : 4:2:2 Scan type : Progressive Bits/(Pixel*Frame) : 1.221 Stream size : 20.8 GiB (99%) Title : Core Media Video Writing library : Apple Encoded date : 2025-11-14 05:11:59 UTC Tagged date : 2025-11-14 05:14:03 UTC Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709 Audio ID : 1 Format : PCM Format settings : Little / Signed Codec ID : lpcm Duration : 4 min 54 s Bit rate mode : Constant Bit rate : 2 304 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Bit depth : 24 bits Stream size : 80.8 MiB (0%) Title : Core Media Audio Encoded date : 2025-11-14 05:11:59 UTC Tagged date : 2025-11-14 05:14:03 UTC Other ID : 3 Type : Time code Format : QuickTime TC Duration : 4 min 54 s Frame rate : 60.000 FPS Time code of first frame : 00:00:00:00 Time code of last frame : 00:04:54:18 Time code, stripped : Yes Title : Core Media Time Code Encoded date : 2025-11-14 05:11:59 UTC Tagged date : 2025-11-14 05:14:03 UTC

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[Ben Balser]

As this was answered in the Apple forum, there’s no volume difference between the two audio codecs you’re referring to. Changing from one to the other will NOT have any influence on the sound level. That is purely determined by the gain settings during the source recording and/or the mastering in the edit. But if you needed to do this, and it would make zero change in volume (I’m retired audio engineer), you should look at creating a custom preset in Compressor (if it’ll even let you do that).

[Eddie Valentin]

Thank You Ben