Tip: Join two avi file with mencoder

[kd7swh]

Joining two or more avi files is easy with mencoder.

Here is a simple script that I use to do it:

# MjAVI - 2007
#Mencoder needs to be installed for this script to work
#The Numbers in this script could be changed to combine more than two files.
# Mencoder also supports mpeg files. So the .avi could also be changed to .mpg


echo "Script to combine two avi files, while syncing audio."
echo "usage: ./mjavi a1.avi a2.avi combined_temp.avi final.avi" 

cat "$1" "$2" > "$3";
mencoder -forceidx -oac copy -ovc copy "$3" -o "$4"

the cat command combines 1 and 2 into 3, but the audio isn't in sync. So, 3 is indexed with mencoder into 4 which has nicely synced audio.

[neilp85]

There's no reason to cat the two files together before encoding because mencoder can handle that as well.

mencoder -forceidx -ovc copy -oac copy -o file.avi p1.avi p2.avi ...

[LucasLinard]

There's no reason to cat the two files together before encoding because mencoder can handle that as well.

mencoder -forceidx -ovc copy -oac copy -o file.avi p1.avi p2.avi ...

When I try to join 2 mpeg files, how can I make the oputput a mpg file?
If I try -of mpeg I get a lot of errores like this one:
ERROR: scr 6715.707, dts 0.000, pts 6714.866

ERROR: scr 6715.752, dts 0.000, pts 6714.962

ERROR: scr 6715.794, dts 0.000, pts 6715.058

ERROR: scr 6715.837, dts 0.000, pts 6715.122

ERROR: scr 6715.885, dts 0.000, pts 6715.218

ERROR: scr 6715.925, dts 6715.283, pts 6715.408

ERROR: scr 6715.927, dts 0.000, pts 6715.282

ERROR: scr 6715.979, dts 0.000, pts 6715.378

ERROR: scr 6716.025, dts 0.000, pts 6715.474

ERROR: scr 6716.066, dts 0.000, pts 6715.538

ERROR: scr 6716.090, dts 6715.575, pts 6715.700
Pos:6716.1s 161028f (88%) 473.28fps Trem: 0min 2904mb A-V:0.066 [2976:192]
ERROR: scr 6716.162, dts 0.000, pts 6715.634

ERROR: scr 6716.210, dts 0.000, pts 6715.730

ERROR: scr 6716.254, dts 0.000, pts 6715.794

ERROR: scr 6716.302, dts 0.000, pts 6715.890

ERROR: scr 6716.358, dts 0.000, pts 6715.954

ERROR: scr 6716.369, dts 6716.034, pts 6716.159

ERROR: scr 6716.371, dts 0.000, pts 6716.050

ERROR: scr 6716.406, dts 0.000, pts 6716.146

ERROR: scr 6716.441, dts 0.000, pts 6716.210

ERROR: scr 6716.485, dts 0.000, pts 6716.306

ERROR: scr 6716.511, dts 6716.326, pts 6716.451
Pos:6716.9s 161046f (88%) 473.30fps Trem: 0min 2904mb A-V:0.055 [2976:192]

[DerArzt]

Cheers neilp85. Worked PERFECTLY.

[tzulberti]

Thanks for the tip

[z987k]

When I try to join 2 mpeg files, how can I make the oputput a mpg file?
If I try -of mpeg I get a lot of errores like this one:
ERROR: scr 6715.707, dts 0.000, pts 6714.866

ERROR: scr 6715.752, dts 0.000, pts 6714.962

ERROR: scr 6715.794, dts 0.000, pts 6715.058

ERROR: scr 6715.837, dts 0.000, pts 6715.122

ERROR: scr 6715.885, dts 0.000, pts 6715.218

ERROR: scr 6715.925, dts 6715.283, pts 6715.408

ERROR: scr 6715.927, dts 0.000, pts 6715.282

ERROR: scr 6715.979, dts 0.000, pts 6715.378

ERROR: scr 6716.025, dts 0.000, pts 6715.474

ERROR: scr 6716.066, dts 0.000, pts 6715.538

ERROR: scr 6716.090, dts 6715.575, pts 6715.700
Pos:6716.1s 161028f (88%) 473.28fps Trem: 0min 2904mb A-V:0.066 [2976:192]
ERROR: scr 6716.162, dts 0.000, pts 6715.634

ERROR: scr 6716.210, dts 0.000, pts 6715.730

ERROR: scr 6716.254, dts 0.000, pts 6715.794

ERROR: scr 6716.302, dts 0.000, pts 6715.890

ERROR: scr 6716.358, dts 0.000, pts 6715.954

ERROR: scr 6716.369, dts 6716.034, pts 6716.159

ERROR: scr 6716.371, dts 0.000, pts 6716.050

ERROR: scr 6716.406, dts 0.000, pts 6716.146

ERROR: scr 6716.441, dts 0.000, pts 6716.210

ERROR: scr 6716.485, dts 0.000, pts 6716.306

ERROR: scr 6716.511, dts 6716.326, pts 6716.451
Pos:6716.9s 161046f (88%) 473.30fps Trem: 0min 2904mb A-V:0.055 [2976:192]

http://www.mplayerhq.hu/DOCS/HTML/en...feat-mpeg.html

Also if you have two mpg's of the same format, couldn't you just "cat 1 2 > 3"?

[kd7swh]

if you just use cat, its my understanding that the index would not be preserved. this process creates a working index.

[yabbadabbadont]

How about just using avimerge which is included with transcode?

Edit: Wow! Holy Thread Resurrection Batman!

[kd7swh]

I created this thread almost a year ago, a lot has changed since then.

[lad3391]

i just found it, and it works great for me. i guess my only suggestion to ppl reading this would be to type in 'cd ~/Desktop' into terminal (if thats where your files are at), no ' symbols, just the stuff between. type that before you do the mencoder command line