merger

[asiafan]

Can some1 help me how to merge/append + 50 vids 1080p without encoding? i have adobe premiere but its reencode and its mp4 so i am cutting out this tool . I have avidemux not fully helps its merging but suddenly appear " video incomplete" i was trying mkv merger created 2gb file but after playing its just one file nothing else. Do we have any free tool then? i want to put my own audio to this video but i cant event connect all vidz in 1 mp4/mkv file

[abolibibelot]

i was trying mkv merger created 2gb file but after playing its just one file nothing else.

Not sure if I understood that part correctly. You mean only the first (original) file is actually readable even though the output is 2GB ?
It may work with MKVToolNix or a mkvmerge script. Beware of possible synchronization issues (apparently the goal is to change the audio afterward so that's not too much of an issue).
Or with a ffmpeg script like this (provided by “Budman1” in this thread) :

ffmpeg -i input1.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i input2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i input3.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts" -c copy -bsf:a aac_adtstoasc output.mp4

(Replace “output.mp4” by “output.mkv” if you want mkv.)
This method is lossless and is usually very reliable when it comes to preserving audio synchronization.