--extract-audio progress

[porjo]

The following patch will send the encoding progress output from FFMPEG to youtube-dl stdout ( code taken from http://stackoverflow.com/a/2525493 )

--- youtube-dl  2012-01-16 03:23:22.000000000 +0000
+++ youtube-dl.new  2012-02-08 01:02:28.366720567 +0000
@@ -4075,7 +4075,13 @@
        cmd = ['ffmpeg', '-y', '-i', _encodeFilename(path), '-vn'] + acodec_opts + more_opts + ['--', _encodeFilename(out_path)]
        try:
            p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-           stdout,stderr = p.communicate()
+           while True:
+               out = p.stderr.read(1)
+               if out == '' and p.poll() != None:
+                   break
+               if out != '':
+                   sys.stdout.write(out)
+                   sys.stdout.flush()
        except (IOError, OSError):
            e = sys.exc_info()[1]
            if isinstance(e, OSError) and e.errno == 2:

[phihag]

I'm not certain that we should output ffmpeg's status; that may confuse some programs that parse our output. I'll leave this open; in the next batch of changes (probably April, May), I expect an API to make it. Once that API is established, we'll have more freedom over what we output.

[rgl]

Can't all lines be prefixed with [ffmpeg] so they don't confuse other programs?

[fergalmoran]

Are we ever going to get this implemented? #1304 seems to track this but it's been locked so can't comment. I've been tracking that issue for over a year now and no updates??

[MrRopain]

Would be much appreciated.