[ubuntu] can't run playdv from bash script

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http://ubuntuforums.org – right up front: am linux noob setting up machine strictly for dv/1394 capture & encode; found skullmunky's 1/23/11 post very helpful. am running command line dvgrab piped into ffmpeg to produce a (don't laugh, have to do for compat sake) wmv for weekly upload to website. works great, but would like preview, so as suggested in skullmunky's post, used tee to send to both ffmpeg & playdv (avconv). this works great too, as long as typed into terminal & run, but when try to run from bash script, can't get to run.. later in testing, found couldn't get playdv to ever run from script. coul (Hardware)