Just an idea.
Why don't you use ajax and only allow on conversion per user at a time.
You can create an ajax query to check on progress, plus the user can
cancel. Basically detach the conversion from the web client, but allow
client to check on progress and have access to the file when it has
finished.
On 21/12/2013 5:40 am, Nicola Worthington wrote:
I have a handler that transcodes video files using ffmpeg which all
works fine. However, if the web client disconnects or otherwise stops
reading from the socket, my handler will continue reading from the
ffmpeg filehandle and writing out to the writer object until ffmpeg
has completed the transcode.
This wouldn't be a problem is we lived in a perfect world where every
web client would send a single request to a URL and not make
additional requests until the first one had been completed, but of
course we don't live in an ideal world,.. and I would prefer my webapp
not kill the server it is running on my spawning off more CPU
intensive processes than necessary.
Is there any way for me to determine how much data is sat waiting to
be flushed to the web client so that if it exceeded a predetermined
number of bytes I can assume that I should kill my ffmpeg file handle
and exit the handler prematurely,.. or any other way to determine if
the web client has gone away?
Apologies if I haven't explained myself especially articulately.
This is the handler in question:
*get '/stream/:file/:format' => sub {*
* my $file = params->{file};*
* my $format = params->{format};*
*
*
* return send_file(*
*'favicon.ico',*
* streaming => 1,*
* callbacks => {*
*override => sub {*
* my ($respond, $response) = @_;*
*
*
* my $mime = 'video/mp4';*
* my @ffmpeg_args = qw(-threads 0 -i $file);*
*
*
* if (exists $ffmpeg_formats{$format}) {*
* $mime = 'video/' . $format;*
* push @ffmpeg_args, @{$ffmpeg_formats{$format}};*
* } else {*
* push @ffmpeg_args, @{$ffmpeg_formats{mp4}};*
* }*
*push @ffmpeg_args, '-';*
*
*
* my $writer = $respond->([200, ['Content-Type' =>
$mime]]);*
*open(my $fh, '-|', join(' ', '/usr/bin/ffmpeg', @ffmpeg_args));*
* my $buffer;*
*while (read($fh, $buffer, 1024) ) {*
* $writer->write($buffer);*
* }*
*close($fh);*
* },*
* },*
* );*
*};*
--
Nicola Worthington
[email protected] <mailto:[email protected]>
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