Be part of JetBrains PHPverse 2026 on June 9 – a free online event bringing PHP devs worldwide together.
I'm creating an api with laravel and it needs to merge a video with a background audio. The way I'm doing it is like this:
$code2 = "ffmpeg -i fim.mp4 -stream_loop -1 -i voz.wav -c:v copy -filter_complex \"[0:a]aformat=fltp:44100:stereo,apad[0a];[1]aformat=fltp:44100:stereo,volume=1[1a];[0a][1a]amerge[a]\" -map 0:v -map \"[a]\" -ac 2 -shortest output.mp4";
system($code2);
Video and audio can have different durations. But I need the audio to repeat only once in the video. This command causes the background audio to be repeated until the end of the video. How do I stop the background audio from repeating until the end of the video?
Remove -stream_loop -1 and maybe also remove -shortest ?
From ffmpeg documentation:
https://ffmpeg.org/ffmpeg.html#Main-options
-stream_loop number (input)Set number of times input stream shall be looped. Loop 0 means no loop, loop -1 means infinite loop.
-shortest (output)Finish encoding when the shortest output stream ends.
It didn't work but almost...
When the background audio timed out, the video audio was also muted. Any suggestion?
And if I remove the -stream_loop -1 and keep -shortest, the video is shortened to the size of the background audio
As you are merging both audio streams in the filter, maybe swapping them can help, I am not sure.
Maybe this can help:
https://stackoverflow.com/a/11783474
Look at the "Add audio" example, you can generate an output with two audio streams instead of merging them
This kind of question might be better suited for an ffmpeg forum, or at least one that is geared towards video and audio.
I suggest http:://www.doom9.org or https://videohelp.com
Thanks for the suggestions.
I found a solution. It merges the two audios first and then takes the image and generates the video:
$code = "ffmpeg -y -i voz.wav -i background.wav -filter_complex \"[0]apad[a];[a][1]amerge[aout]\" -map \"[aout]\" -c:a libmp3lame -q:a 4 output.mp3";
$code1 = "ffmpeg -loop 1 -i result.jpg -i output.mp3 -shortest -acodec copy fim.mp4";
system($code);
system($code1);
Please or to participate in this conversation.