[Pyparsing] Newbie question - conditional parsing/actions

[Robin Siebler]

I am new to this and I am having trouble figuring out how to parse the
below text. Much of the data in the 2 blocks below are similar. There is
one crucial keyword that will differentiate the 2 blocks: the 1st line
will either contain "vide (Video)" or "soun (Audio)". I can't figure
out how to determine which one is present in the first line and then how
to say 'If it is "vide" do this, otherwise do that'.


Track ID 1 vide (Video) Enabled Self-contained
Format vide/avc1 dimensions: video 1920 x 1080, presentation: 1920 x 1080 (pixelAspect+clean), cleanAperture: 1920 x 1080 @ 0,0 (originTopLeft)
Media Timescale: 600 Duration: 14076/600 00:00:23.460 MinSampleDuration: 10/600 AdvanceDecodeDelta: 0/600 00:00:00.000
Num data bytes: 91412686 Est. data rate: 31.172 Mbps Nominal framerate: 59.974 fps 1407 samples
Included in auto selection. Language code<und>
Dimensions: 1920 x 1080 CleanAperture: 1920 x 1080 ProductionAperture: 1920 x 1080 EncodedPixels: 1920 x 1080 Track Matrix: 0.0 1.0 0.0 / -1.0 0.0 0.0 / 1080.0 0.0 1.0
1 edit: Media start 0/600 00:00:00.000 dur 14076/600 00:00:23.460 Track start 0/600 00:00:00.000 dur 14076/600 00:00:23.460

Track ID 2 soun (Audio) Enabled Self-contained
Format soun/aac 44100 Hz aac FormatFlags: 0x00000000 Bytes/Pkt: 0 Frames/Pkt: 1024 Bytes/Frame: 0 Chan/Frame: 1 Bits/Chan: 0 Reserved: 0x00000000
ChannelLayout: Mono
Media Timescale: 44100 Duration: 1037312/44100 00:00:23.522 MinSampleDuration: 1024/44100 AdvanceDecodeDelta: 0/44100 00:00:00.000
Num data bytes: 184508 Est. data rate: 62.753 kbps Nominal framerate: 43.066 fps 1013 samples
Track volume: 1
Included in auto selection. Language code<und>
Dimensions: 0 x 0 Track Matrix: 1.0 0.0 0.0 / 0.0 1.0 0.0 / 0.0 0.0 1.0
1 edit: Media start 0/44100 00:00:00.000 dur 14076/600 00:00:23.460 Track start 0/600 00:00:00.000 dur 14076/600 00:00:23.460