Exactly as the title says.
I do not have surround sound and I would like to make the movie a little smaller by removing the extra (on this movie 6) audio tracks that I would never hear anyway. I prefer not to downsample audio, but if I must then I will.
I know the free audio tool audacity can separate tracks but it cannot merge them back to ac3, as it only exports .wav and also it can convert into other formats.
Try StreamFab Downloader and download from Netflix, Amazon, Youtube! Or Try DVDFab and copy Blu-rays! or rip iTunes movies!
+ Reply to Thread
Results 1 to 5 of 5
Thread
-
-
You can use clever Ffmpeg-GUI for this. In the audioconversion section there is special channel setting 5.1 to 2.
-
You can't just remmux only the left and right channels. Most of the dialog is usually on the center channel. So the audio has to be mixed and re-encoded. Some ffmpeg command lines can be found here:
https://forum.videohelp.com/threads/369941-Quiet-sound-on-youtube/page2#post2624244 -
Next to ffmpeg, eac3to can also convert 5.1 AC3 to AC3 stereo. You may wanna use UsEac3to as a GUI.
If you mean downsampling as in sampling rates, they will be the same.
If you mean the phrase "downsampling" more generally as also being downmixed into fewer channels, take notice of what will happen during AC3 5.1 to AC3 2 channel.
In short, 5.1 AC3 will be decoded into six mono pcm streams. These will be remixed to 2 channel pcm, which will then be encoded back into AC3. You can imagine this process is not lossless.
This can be interpreted in more than one way.
I don't know what equipment you use, but maybe your playback device can do the down-mixing for you. In case you have a surround amp with just 2 speakers connected, the amp could probably do it for you.
If any device in your playback chain is not able to handle surround sound in any way, then indeed you'll need to convert the audiosource to stereo.
[EDIT] Sorry jagabo, you beat me to it by a few minutes... -
Thank you all for the replies. I really appreciate it. I will also check out the mentioned tools and see what works best for me.
Similar Threads
-
Lossless AC3 channel separation/split tool
By yukichigai in forum AudioReplies: 3Last Post: 22nd Sep 2020, 01:13 -
Any command line tool for windows to edit MP4 metadata without remuxing?
By dothrakihorde in forum EditingReplies: 7Last Post: 16th Aug 2018, 19:00 -
How to Convert 2 channel stereo wave into DD5.1 AC3 448 / AC 640
By Bonie81 in forum User guidesReplies: 36Last Post: 2nd Feb 2018, 13:42 -
Convert 6 Channel AAC to 6 Channel AC3
By TheRandomOne in forum AudioReplies: 18Last Post: 4th Jul 2017, 11:40 -
FFMPEG: Guessed channel mono instead of stereo
By batko in forum Newbie / General discussionsReplies: 5Last Post: 21st Feb 2017, 17:43