Using audio from another video

[jimmy80]

Hi Everyone,

I have 2 videos. One is HD (no audio) and the other is SD (with audio). What is the best program to use the audio stream from the SD video in my HD video? They are old videos saved on a DVD from years ago, and just trying to make a decent version.

Thanks in advance.

[ProWo]

What format have your 2 videos? Mpg, vob, mp4, ts, webm? Tell us more...

[Cornucopia]

Lots of people ask about this type of thing, and while it can be done, the most important question is (2-part): are they both the same runtime/length, with the program using the same cuts?
If you can answer YES to those, the job is easy. If either one is a NO, the job becomes much harder (to the point of sometimes being impossible).


Scott

[jimmy80]

Thanks for the replies. Both are the same video/runtime (MP4 format). Just different sizes SD and HD, but the audio was broken on the HD one for some reason.

[butterw]

If there are no sync issues it's a simple lossless demux/remux operation. you can use ffmpeg or mkvtoolnix GUI for this.

ffmpeg -i "hd.mp4" -i "sd.mp4" -c copy -map 0:v -map 1:a "hd_out.mp4"

[jimmy80]

Thanks for the info butterw! I used the mkvtoolnix app and it worked a treat! It saved in a split second, so I know there was no conversion, etc, just 1:1.

My source file is mp4, is there any way to save it out as mp4? (it's not important, just curious). Thanks again!

[butterw]

Sure, you can mux mkv to mp4 with ffmpeg.

Use Avidemux if you prefer having a GUI.