Re: Error in streamed MPEG4 handling - Movie.pm or Audio::Scan error ?

bpa wrote: 
> I have a patched Movie.pm which seems to play The problem URLs and a
> random m4a podcast which has a "normal" mdat.  Need more example to
> test.
> 
> I used Audio::Scan seek_offset to update the "audio_offset" rather than
> first data in mdat.
> 
> > 
Code:
--------------------
  >   > 
  > /slimserver-public-8.3/Slim/Formats$ diff org-Movie.pm Movie.pm 
  > 270a271,274
  > > 
  > >       $fh->seek(0, 0);
  > >       my $seek_offset = Audio::Scan->find_frame_fh_return_info( mp4 => $fh, 0 )->{'seek_offset'};
  > > 
  > 277c281
  > <       $info->{audio_offset} = $args->{_mdat_} + 8;
  > ---
  > >       $info->{audio_offset} = $seek_offset;
  > 
--------------------
> > 
> 
> In parseStream routine
> > 
Code:
--------------------
  >   > 
  > # finally got it, add 'moov' size it if was last atom                                   # finally got it, add 'moov' size it if was last atom
  > substr($args->{_scanbuf}, $args->{_offset} + ($args->{_atom} eq 'moov' ? $arg           substr($args->{_scanbuf}, $args->{_offset} + ($args->{_atom} eq 'moov' ? $arg
  > 
  > # put at least 16 bytes after mdat or it confuses audio::scan (and header cre           # put at least 16 bytes after mdat or it confuses audio::scan (and header cre
  > my $fh = File::Temp->new( DIR => Slim::Utils::Misc::getTempDir);                        my $fh = File::Temp->new( DIR => Slim::Utils::Misc::getTempDir);
  > $fh->write($args->{_scanbuf} . pack('N', $args->{_audio_size}) . 'mdat' . ' '           $fh->write($args->{_scanbuf} . pack('N', $args->{_audio_size}) . 'mdat' . ' '
  > >
  > >         $fh->seek(0, 0);
  > >         my $seek_offset = Audio::Scan->find_frame_fh_return_info( mp4 => $fh, 0 )->{'seek_offset'}
  > >
  > $fh->seek(0, 0);                                                                        $fh->seek(0, 0);
  > 
  > my $info = Audio::Scan->scan_fh( mp4 => $fh )->{info};                                  my $info = Audio::Scan->scan_fh( mp4 => $fh )->{info};
  > $info->{fh} = $fh;                                                                      $info->{fh} = $fh;
  > 
  > # the offset is *after* the mdat atom, make size consistent                             # the offset is *after* the mdat atom, make size consistent
  > $info->{audio_offset} = $args->{_mdat_} + 8;                                  |         $info->{audio_offset} = $seek_offset;
  > $info->{audio_size} -= 8;                                                               $info->{audio_size} -= 8;
  > 
  > # MPEG-4 audio = 64,  MPEG-4 ADTS main = 102, MPEG-4 ADTS Low Complexity = 10           # MPEG-4 audio = 64,  MPEG-4 ADTS main = 102, MPEG-4 ADTS Low Complexity = 10
  > # MPEG-4 ADTS Scalable Sampling Rate = 104                                              # MPEG-4 ADTS Scalable Sampling Rate = 104
  > if ($info->{tracks}->[0] && $info->{tracks}->[0]->{audio_type} == 64) {                 if ($info->{tracks}->[0] && $info->{tracks}->[0]->{audio_type} == 64) {
  > $info->{processors} = { 'aac' => \&setADTSProcess };                                    $info->{processors} = { 'aac' => \&setADTSProcess };
  > }                                                                                       }
  > 
  > return $info;                                                                           return $info;
  > 
--------------------
> > 

Thanks - I will also try to understand why my simple mdat offset
calculation does not work



LMS 8.2 on Odroid-C4 - *SqueezeAMP!*, 5xRadio, 5xBoom, 2xDuet, 1xTouch,
1xSB3. Sonos PLAY:3, PLAY:5, Marantz NR1603, Foobar2000, ShairPortW,
2xChromecast Audio, Chromecast v1 and v2, Squeezelite on Pi,  Yamaha
WX-010, AppleTV 4, Airport Express, GGMM E5, RivaArena 1 & 3
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