https://wiki.hydrogenaudio.org/api.php?action=feedcontributions&feedformat=atom&user=70.112.184.144 2026-04-29T05:03:23Z User contributions MediaWiki 1.44.2 https://wiki.hydrogenaudio.org/index.php?title=Foobar2000:ReplayGain_Scanner:Alter_File_Content&diff=28551 2019-08-12T00:32:15Z

<p>70.112.184.144: </p> <hr /> <div>{{fb2k prefs|foobar2000 Preferences ReplayGain Scanner Alter File Content.png|Alter File Content}}<br /> This feature applies ReplayGain adjustment - or manual adjustment - directly to audio data on supported file formats.<br /> <br /> == No undo option - back your files up first! ==<br /> There is no way to undo the adjustment. If you're not 100% confident in what you're about to do, please make backup copy of your files first. Additionally, a file will be left partially altered if the operation is cancelled halfway thru, with no way to recover.<br /> <br /> Manually applying a reverse adjustment may not produce a file bit identical to the original file due to scalefactor clipping.<br /> <br /> == How to use ==<br /> Select one or more audio files, right click, choose ReplayGain / Apply (track/album) Gain to File Content.<br /> <br /> == Supported formats ==<br /> * Standalone MP3 and MP2 files<br /> * MP4/M4A files with AAC, MP3 or MP2 audio<br /> * Matroska files with AAC, MP3 or MP2 audio<br /> <br /> === Video files ===<br /> It is worth noting that this feature has been extensively tested and works with audio streams in video files.<br /> <br /> === foobar2000 version notes ===<br /> MP2 codec support added in foobar2000 v1.4 beta 1.<br /> <br /> Matroska format support added in foobar2000 v1.4 beta 4.<br /> <br /> == Advantages over tag based ReplayGain ==<br /> Files altered this way will play with their intended loudness in every software or hardware player, regardless of its ReplayGain support.<br /> <br /> This is particularly useful for manipulating loudness of audio streams in MP4 video files, as video players rarely support ReplayGain.<br /> <br /> == How it works ==<br /> Each compressed audio frame contains scalefactor fields that control the loudness of decoded audio. These fields can be manipulated without having to re-encode the entire payload.<br /> Hence, the adjustment is lossless - except for the possibility of adjusted scalefactors exceeding the finite allowed range and becoming clipped. The potential artifacts from this should not be audible - however, the adjustment should not be applied more than once to the same file.<br /> <br /> == Opus header gain ==<br /> In foobar2000 v1.4, a similar feature to &quot;alter file content&quot; was introduced for Opus files. However, it does not alter the entire audio stream, it alters Opus header gain value - which every compliant decoder is required to respect. It does not suffer from any of the issues noted above and can be fully reversed.<br /> <br /> Opus header gain adjustment is currently supported for plain Opus files as well as Opus in Matroska.</div>

70.112.184.144