Using FFMPEG give an error

[koalitiondavid]

I'm using the code in ffmpeg.js.
When I start it, I'm receiving this error and nothing works.

const ffmpeg = exec(ffmpeg -y -i - -c copy output.mp4);

[ipod @ 0x557ce155f040] Could not find tag for codec vp8 in stream #0, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #0:0 -> #0:1 (copy)

Thank you!

[koalitiondavid]

Finally, I solved my problem.

Here my arguments used
const exec_ffmpeg = [
'ffmpeg', '-thread_queue_size', '4096', '-f', 'webm', '-r', '30', '-i', 'pipe:0',
'-c:v', 'libx264', '-preset', 'veryFast', '-pix_fmt', 'yuv420p',
'-acodec', 'aac', '-movflags', '+faststart', "output.mp4"
];