How to concatenate two MP4 files using FFmpeg?

Question

I\'m trying to concatenate two mp4 files using ffmpeg. I need this to be an automatic process hence why I chose ffmpeg. I\'m converting the two files into .ts files and th

Answer 1

After various tries below script worked for me on windows 10 powershell.

    $files=Get-ChildItem -path e:\ -Filter *.mp4


    $files| ForEach-Object  {"file '$($_.FullName)'"}| Out-File -FilePath e:\temp.txt -Encoding ASCII


    if (-not (test-path "e:\ffmpeg\bin\ffmpeg.exe")) {throw "e:\ffmpeg\bin\ffmpeg.exe needed"}

    E:\ffmpeg\bin\ffmpeg.exe -safe 0 -f concat -i "e:\temp.txt" -c copy -bsf:v hevc_mp4toannexb -an e:\joined.mp4

    # Conversion Cleanup
    Remove-Item e:\temp.txt

Here first two lines create a text file temp.txt which has following content

file 'e:\first.mp4'
file 'e:\second.mp4'

3rd, 4th lines checks if ffmpeg is available at path and create the "joined.mp4"

The key differences from other answers are as below

usage  of -bsf:v hevc_mp4toannexb -an

for my mp4 file above worked, you may need to use other alternatives like below depending on your video encoding.

h264_mp4toannexb

All such possible Bitstream filters can be found at https://ffmpeg.org/ffmpeg-bitstream-filters.html