MySql Not accessing parent in subquery?

I get the error

Unknown column 'm.id' in 'on clause'

all my tables have a field called id. It appears to occur in my subquery. I use m.id in my join. So what the heck is going on? shouldnt i be able to access that var? how do i access media.id from my subquery? Also is the and not (select 1 part right? i am trying to exclude that tag.

select m.id from media m 
join tag_name as n0 on n0.title = @a0 
    join media_tag as t0 on t0.media_id=m.id AND t0.tag_id = n0.id
where 1 
AND not (select 1 from tag_name as n1
    join media_tag as t1 on t1.media_id=m.id AND t1.tag_id = n1.id
    whe开发者_如何学Cre n1.title = @a1) 
order by m.id desc;

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Move the check of t1.media_id=m.id to the where clause and it works (for me, anyway):

select m.id from media m 
join tag_name as n0 on n0.title = @a0 
    join media_tag as t0 on t0.media_id=m.id AND t0.tag_id = n0.id
where 1
AND not (select 1 from tag_name as n1
    join media_tag as t1 on t1.tag_id = n1.id
    where t1.media_id=m.id AND n1.title = @a1) 
order by m.id desc;