ffmpeg go pipe youtube-dl
I currently have this function, that pipes multiple youtubedl commands thru ffmpeg, and then pipes the output of ffmpeg to an HTTP client.
func pipeThruFfmpegToMp4(vi *VideoInfo, rw web.ResponseWriter) error {
var ffmpeg *exec.Cmd
ffmpeg = exec.Command(
"ffmpeg",
"-i", "-",
"-i", "pipe:3",
"-c:v", "copy", "-c:a", "copy",
"-preset", "veryfast",
"-metadata", fmt.Sprintf(`title=%s`, vi.GetTitle()),
"-movflags", "frag_keyframe+empty_moov",
"-f", "mp4",
"-")
youtubevideo := exec.Command(YoutubeDLPath, "-c", "-f", fmt.Sprintf("%s/bestvideo[ext=mp4]/bestvideo/best", vi.GetFormat()), "--no-cache-dir", "--restrict-filenames", "--hls-prefer-native", "-o", "-", fmt.Sprintf("%s", vi.GetVideoUrl()))
fmt.Println(youtubevideo)
youtube := exec.Command(YoutubeDLPath, "-c", "-f", "bestaudio[ext=m4a]/bestaudio/best", "--no-cache-dir", "--restrict-filenames", "--hls-prefer-native", "-o", "-", fmt.Sprintf("%s", vi.GetVideoUrl()))
fmt.Println(youtube)
var ytvbuf, ytbuf, ffbuf bytes.Buffer
youtubevideo.Stderr = &ytvbuf
youtube.Stderr = &ytbuf
ffmpeg.Stderr = &ffbuf
video, err := youtubevideo.StdoutPipe()
if err != nil {
log.Printf("pipeThruFfmpegToMp4: %v\n", err)
return err
}
pipe3, err := youtube.StdoutPipe()
if err != nil {
log.Printf("pipeThruFfmpegToMp4: %v\n", err)
return err
}
ffmpeg.Stdin = video
ffmpeg.ExtraFiles = []*os.File{pipe3.(*os.File)}
ffmpeg.Stdout = rw
// Headers sent, no turning back now
rw.Header().Set("Content-Type", "video/mp4")
rw.Header().Set("Content-Disposition", fmt.Sprintf("attachment;filename=\"%s.mp4\"", vi.GetSlug()))
rw.Flush()
ffmpeg.Start()
youtubevideo.Start()
youtube.Start()
ffmpeg.Wait()
youtubevideo.Wait()
youtube.Wait()
// check ytvbuf, ytbuf, ffbuf for stderr errors
if ffbuf.Len() != 0 {
rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ffbuf.String()})
log.Printf("pipeThruFfmpegToMp4: %v\n", ffbuf.String())
}
if ytvbuf.Len() != 0 {
rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ytvbuf.String()})
log.Printf("pipeThruYouTubevDLToMp4: %v\n", ytvbuf.String())
}
if ytbuf.Len() != 0 {
rollbar.Error(rollbar.ERR, err, &rollbar.Field{"stderr", ytbuf.String()})
log.Printf("pipeThruYouTubeDLToMp4: %v\n", ytbuf.String())
}
return nil
}
The problem is that everything runs fine, but after a while the ram starts filling up on the server, till it gets to the point that it errors out with runtime/cgo: pthread_create failed: Resource temporarily unavailable
I'm unsure if it's a memory leak, or if either instance of youtube-dl is not closing right or if ffmpeg isn't closing right and just consuming more and more ram as the program runs more, until the program crashes with this error
runtime/cgo: pthread_create failed: Resource temporarily unavailable
SIGABRT: abort
PC=0x7f083501fe97 m=128 sigcode=18446744073709551610
goroutine 0 [idle]:
runtime: unknown pc 0x7f083501fe97
stack: frame={sp:0x7f05ff7fd7d0, fp:0x0} stack=[0x7f05feffe288,0x7f05ff7fde88)
00007f05ff7fd6d0: 00007f05ff7fd700 0000ffff00001fa0
00007f05ff7fd6e0: 00007f05ff7fdbe0 00007f05f8000da0
00007f05ff7fd6f0: 0000000000000000 000000000093032c
00007f05ff7fd700: 0000000000000000 00007f0835600ec3
00007f05ff7fd710: 0000000000000005 0000000000000000
00007f05ff7fd720: 000000c0000ce120 00007f0834ff1ce0
00007f05ff7fd730: 00007f05ff7fdaf0 00007f083560870a
00007f05ff7fd740: 0000000000000000 0000000000000000
00007f05ff7fd750: 0000000000000000 00007f05ff7fdbe0
00007f05ff7fd760: 2525252525252525 2525252525252525
00007f05ff7fd770: 000000ffffffffff 0000000000000000
00007f05ff7fd780: 000000ffffffffff 0000000000000000
00007f05ff7fd790: 000000c00010d1a0 000000c000953740
00007f05ff7fd7a0: 000000c0000ce120 000000c000cf2300
00007f05ff7fd7b0: 000000c00010d260 000000c001f4e180
00007f05ff7fd7c0: 000000c001f4e000 000000c00169f680
00007f05ff7fd7d0: <0000000000000000 000000c001f34180
00007f05ff7fd7e0: 6e75720000000000 6f67632f656d6974
00007f05ff7fd7f0: 0000000000000000 0000000000000000
00007f05ff7fd800: 000000c000cf2300 000000c00010d260
00007f05ff7fd810: 000000c001f4e180 000000c001f4e000
00007f05ff7fd820: 000000c00169f680 000000c00169f500
00007f05ff7fd830: 000000c001f34180 000000c001f34000
00007f05ff7fd840: 000000c000c92780 000000c001ec2600
00007f05ff7fd850: fffffffe7fffffff ffffffffffffffff
00007f05ff7fd860: ffffffffffffffff ffffffffffffffff
00007f05ff7fd870: ffffffffffffffff ffffffffffffffff
00007f05ff7fd880: ffffffffffffffff ffffffffffffffff
00007f05ff7fd890: ffffffffffffffff ffffffffffffffff
00007f05ff7fd8a0: ffffffffffffffff ffffffffffffffff
00007f05ff7fd8b0: ffffffffffffffff ffffffffffffffff
00007f05ff7fd8c0: ffffffffffffffff ffffffffffffffff
runtime: unknown pc 0x7f083501fe97
stack: frame={sp:0x7f05ff7fd7d0, fp:0x0} stack=[0x7f05feffe288,0x7f05ff7fde88)
00007f05ff7fd6d0: 00007f05ff7fd700 0000ffff00001fa0
00007f05ff7fd6e0: 00007f05ff7fdbe0 00007f05f8000da0
00007f05ff7fd6f0: 0000000000000000 000000000093032c
00007f05ff7fd700: 0000000000000000 00007f0835600ec3
00007f05ff7fd710: 0000000000000005 0000000000000000
I've also tried building the binary with CGO_ENABLED=0 even though I don't even have a import "c" but that also ends up erroring out as well with
runtime: failed to create new OS thread (have 21 already; errno=11)
runtime: may need to increase max user processes (ulimit -u)
fatal error: newosproc
my limit's are already very generouse, which maybe could also be a problem? Or do I maybe have to increase the pipe size?
$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 192907
max locked memory (kbytes, -l) 16384
max memory size (kbytes, -m) unlimited
open files (-n) 100000
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 65536
cpu time (seconds, -t) unlimited
max user processes (-u) 63883
virtual memory (kbytes, -v) unlimited
Either way, I apprecate any and all the help I can get on this. Here is a link to the entire program and here is a thread in the golang-nuts forum regarding this questions
