write EPIPE

[noyessie]

I have got

write EPIPE WriteWrap.afterWrite

I don't know why and how to solve this. this is my parameter:

let avconv_params = [
 "-i","pipe:0",
 "-r","25",
 "-ss","1",
 "-frames:v","1",
 "-f","image2",
 "pipe:1",
 ]