1

i am trying to join 5 videos. 2 of them do not have audio streams.

I get this error :

Stream specifier ':1' in filtergraph description [0:0] [0:1] [1:0] [1:1] [2:0] [2:1] 
[3:0] [3:1] [4:0] [4:1] concat=n=5:v=1:a=1 [v] [a] matches no streams.

I use this arguments

ffmpeg -y  -i "C:\Users\alex\AppData\Local\Temp\tmp83A2.tmp.avi"  -i "C:\Users\alex\AppDat\Local
\Temp\tmp83C2.tmp.avi" -i "C:\Users\alex\AppData\Local\Temp\tmp83F2.tmp.avi"  -i "C:\Users
\alex\AppData\Local\Temp\tmp8412.tmp.avi" -i "C:\Users\alex\AppData\Local\Temp\tmp8442.tmp.avi"  -filter_complex "[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] [3:0] [3:1]` [4:0] [4:1] concat=n=5:v=1:a=1 [v] [a]" -map "[v]" -map "[a]"  "C:\Users\alex\Documents`
\output.avi" 

Thanks !

4

The stream specifier :1 refers to the audio stream which you do not have in all files. So it gives an error. You should mux in blank/silent audio to be able to concatenate.

See this recent post which deals with how to mux in silent audio before concatenating.

ffmpeg -y  -i <inputfile1>  -i <inputfile2> -i <inputfile3> -i <inputfile4> -i <inputfile5> -filter_complex "[0:0] [0:1] [1:0] [1:1] [2:0] [2:1] [3:0] [3:1] [4:0] [4:1] concat=n=5:v=1:a=1 [v] [a]" -map "[v]" -map "[a]"  <encoding_parameters_here> <outputfile>

This should work but you should use some encoding parameters if the codecs of the various input files vary. If using aac for audio, also use -strict -2.

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