View Full Version : [all variants] Reauthoring DVD - Add/change audio track

February 3rd, 2010, 02:10 PM
I received a DVD of my son playing hockey at the Verizon Center in DC. The accompanying audio only comes out of the right channel. I would like to modify it so the same audio comes out of both channels. I have already done some reauthoring (changed the aspect ratio from 4:3 to 16:9). I guess what I am really asking is how to modify/edit an AVI to fix my audio issue.

Any suggestions?

Here is a copy of the video on youtube:



February 3rd, 2010, 10:29 PM
I know in Avidemux there is an option in the audio output to "force stereo" or "dual mono" ( i believe), can't exactly remember, been awhile since i had to do it. :(

February 4th, 2010, 12:08 PM
Hi Chris
I downloaded your video from YouTube.
The sound can be corrected using ffmpeg.
This is the command that I used:-

ffmpeg -i Noah_playing_in_the_Mites_on_Ice_Caps_Video_Feed-3QtOVA8F0pc.mp4 -vcodec copy -acodec libfaac -ab 128kb -ar 48000 -ac 1 result.mp4

-vcodec copy means leave the video alone.
-acodec libfaac -ab 128kb -ar 48000 -ac 1 means use aac encoder at bitrate 128Kbps sample rate 48000Hz.

The important bit is -ac 1. This means just one audio channel, but it comes out of both speakers.
The downloaded file from YouTube is mp4. I expect the same method may be used with avi and other types of files. Use the appropriate audio codec. Use the appropriate suffix for the result file instead of mp4.

I downloaded your video using this command:-

youtube-dl -i -t -f 18 http://www.youtube.com/watch?v=3QtOVA8F0pc

February 10th, 2010, 06:02 PM
Sorry... I was without power for about 36 hours.
I too figured it out. Similar approach...

ffmpeg -i VTS_01_1.VOB -target ntsc-dvd -aspect 16:9 -acodec ac3 -ab 192K -ac 1 final_2.mpg

Thanks for the help. Also... thanks for the tip on youtube-dl.