Is there a program to join ac3 streams that won't reencode it.

[2ZOD.COM]

.....

[2ZOD.COM]

.....

[gircobain]

I don't know of any programs
I do that by performing a binary copy to concatenate the streams together and then running the resulting file through BeSliced to fix the header

[Paulcat]

I don't know of any programs
I do that by performing a binary copy to concatenate the streams together and then running the resulting file through BeSliced to fix the header

If you have VOBs broken into 1GB sections, you can always use VOBEdit to make one large VOB, demuxing that will give you one AC3 file.

If they are AVI files, you can stick them in a Matroska container and use MKVToolnix to merge them and MKVExtract to extract the audio.

[tebasuna51]

The method of gircobain can work in two cases:
1) The part 1 finish with a complete block and the part 2 begin with a header block (Corrects ac3)

2) The part 1 finish with a truncated block and the part 2 begin exactly with the rest of this block (original split exactly)

But in general you must fix the two parts before (whit BeSliced) and join after with:
copy /B part1.ac3 + part2.ac3 complete.ac3