How Do I Normalize a Mp4 File in Xmedia Recode Without Re Encoding It Again

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Limiting/Normalizing dynamic range in already-encoded mp4 or avi

2013-01-21 03:06:17

Hi all, first post to Hydrogenaudio.  Thanks in accelerate for reading.

I have several movies that I have previously ripped from my DVD collection to digital files, ordinarily either MP4 or AVI container, with either AAC or MP3 sound tracks.  My current setup for playback- I use various devices in dissimilar locations to playback files off external hard drives.  (Currently, XBOX360 and Roku.  Maybe primitive, just very convenient.  I don't accept capability nonetheless to stream throughout, in which case something like XBMC may solve my trouble down the road.)  In the concurrently, I've found that many of the files I play have ranges of book much also wide.  (Loud parts style likewise loud and soft parts too soft.)  First, there is some confusion over the appropriate terminology- limiting vs normalizing, so I repent if I apply the wrong 1.  Clarification there may help.  Also, I by and large use Xmedia Recode for various recoding tasks but at that place is no limiter for audio, merely a lowpass filter which wouldn't help me here.  Foobar2000 has 2 limiters, the Advanced limiter and the Difficult -6db limiter, and can load a video file and convert/excerpt (demux) the audio rails in one step to create a new audio rails with selected limits applied, which I can then remux as necessary.  However, information technology is finicky and doesn't allow any specific settings, just whatever is preset with the 'advanced limiter' filter.  I am looking for a program that tin accept a video file and apply whatever kind of filter may be needed to limit volume range in the sound track by scanning track for peaks and converting or re-encoding as necessary, to and so be remuxed with video into a new file.  Any suggestions?

Thanks again.

B

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Limiting/Normalizing dynamic range in already-encoded mp4 or avi

Respond #ane – 2013-01-21 12:02:09

If you're playing back on a PC, some media players (including Windows Media Role player) include things similar Quiet Mode and Auto Volume Leveling which utilize dynamic range compression to prevent serenity audio from disappearing when you lot plow downwards your volume to respect your neighbours late at night, or similarly to boost average loudness every bit much equally possible.

Also Windows Vista and Windows vii offering "Loudness Equalization" if you right click the Volume icon in taskbar, Playback Devices, Select device in apply, Properties, Enhancements. This, once you've found it, is a useful style of evening out book variations in all sound sources when they're annoying and you don't intendance about preserving the dynamic range function of the audio fidelity. Information technology'due south likewise handy on YouTube. It tends to heave overall volume, which you so adjust with the main volume control.

Some TVs too offer some grade of DRC in their sound options.

I recall I've seen options for applying DRC in Handbrake video converter, so that might be worth a await. You lot might be able to laissez passer the video directly without re-encoding, and just transcode the sound. Otherwise things similar MP4Box or FFMPEG might exist able to demux, procedure and remux the streams.

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Limiting/Normalizing dynamic range in already-encoded mp4 or avi

Reply #2 – 2013-01-21 14:49:41

Thanks for the reply.

No DRC on my TVs, and playback is not through PC but via video or gaming consoles that do not offer real time equalization plugins.  Tin can't go DRC to piece of work in Handbrake- it seems I can adjust proceeds just non DRC.  Handbrake doesn't allow transcoding of audio and copy of video file without re-encoding.  Turns out Xmedia recode can transcode the audio with its default selection for "volume normalization -98dB", which I don't know from that clarification exactly what information technology'south doing.  I will await again at FFMPEG.

Any experience with Adobe products?  I'chiliad starting to read that Soundbooth or Audition may offer this capability.

B

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Limiting/Normalizing dynamic range in already-encoded mp4 or avi

Respond #three – 2013-01-21 20:20:47

With both AAC and MP3 information technology OUGHT to exist possible with frame-by-frame global gain (as used by mp3directcut) but I don't call back anyone has implemented DRC this fashion (which doesn't involve transcoding)

MP4Box seems to be highly regarded in the video encoding customs and I've come across a few forum posts using Google on doom9 and video-forums or something like that, giving scripts or commandlines to split a stream into a video.mp4 and an audio.mp4 file (and AVIdemux commands, IIRC, to exercise it with AVI too)

People had then been using mp3gain to adjust volume (but not DRC) and using MP4Box etc to remux the A/V streams into a single MP4.

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