Ffmpeg and video vs audio time

Question

I am with a simple application that performs the download of a video + audio and ' concatenate ' ( Join ) the same with the tool Ffmpeg, the problem is that most of the time the user will download a song larger than the video in question and then it gets a video of 10 seconds and the rest is a screen locked with background sound ... someone would know to inform me the parameters + explanation so that I concaten the song exactly on video length ?

Current code :

ffmpeg -i {0}.{1} -i {2}.{3} -vcodec copy -acodec copy {4}.{5} && rm -rf {0}.{1} {2}.{3}

Research : Video and Audio file format

Answer 1

Assuming you are using via CLI, if the video is shorter than the audio you can simply use:

-shortest (output)

"Finish encoding when the shortest input stream ends."

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I believe this is enough, for test I used via Powershell:

.\ffmpeg.exe `
-i "River - 6815.mp4" -i "Frontliner - Around The World (Extended Mix).wav" `
-c:v copy -c:a aac -map 0:0 -map 1:0 -shortest "resultado.mp4"

The video (River - 6815.mp4) has 13 seconds, while the music (Frontliner - Around The World (Extended Mix)) is 4 minutes and 51 seconds long.

The final video (result.mp4) was with 13 seconds in total and the video and audio was connected normally.