Batch add intro to Videos using FFMPEG

[dexterfox44]

I want to add a 6 sec intro to my videos in bulk

i'm using this command

for %%A in (*.mkv) do ffmpeg -ovc copy -oac copy \intro.mp4 "output\%%A"

Pause

[Budman1]

according to Google:

1. concat video filter

ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv \
  -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=n=3:v=1:a=1 [v] [a]" \
  -map "[v]" -map "[a]" output.mkv

Note that this method performs a re-encode.

2. concat demuxer
mylist.txt

file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'

ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

3. concat protocol
ffmpeg -i "concat:input1|input2" -codec copy output.mkv
This method does not work for many formats, including MP4, due to the nature of these formats and the simplistic concatenation performed by this method.

For batch it would be like:
For %%A in (*.mkv) do ffmpeg -i intro.mp4 -i %%A -filter_complex "[0:v] [0:a] [1:v] [1:a]concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" output.mkv

[Budman1]

Is your intro static images or another video.? Both should be same format, size,etc. So one will probably need to be recorded to match the other.