White Segmented/Dashed Line at Bottom of TV

Has anyone seen this - on some home video movies (made with iMovie 08 and FCE) I see an occasional white "line" at the bottom of my TV when viewing with Apple TV. I even see it on some movies ripped with Handbrake. It's not there always, but maybe 50% of the time. It is at the very bottom of the screen and probably isn't more than 1/2" high. It looks like it is in segments (the line, that is) and some scenes it will disappear altogether. I don't know if it is my Apple TV causing it, or maybe my television, or maybe they just aren't happy together. I thought I would ask on this forum if anyone else sees this before I have to start diagnosing it with Apple.
Can someone help me out here with some observances?

Difficult to say really, many videos can contain additional data at the top or bottom of the viewable area for subtitles etc, ordinarily this is hidden by overscan on a tv display.
The thing to do would be to play the movie on your mac/pc, which won't use overscan and will display your video in full frame. This will let you know whether these issues are caused by the tv or whether they are encoded into the video itself.

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    <Setter Property="Fill" TargetName="rectangle" Value="#FF9d9d9d"/>
    </Trigger>
    <Trigger Property="IsDragging" Value="True">
    <Setter Property="Fill" TargetName="rectangle" Value="#FF79cd00"/>
    </Trigger>
    </ControlTemplate.Triggers>
    </ControlTemplate>
    </Setter.Value>
    </Setter>
    </Style>
    </Thumb.Style>
    </Thumb>
    </Track.Thumb>
    </Track>
    <RepeatButton x:Name="PART_LineRightButton" Grid.Column="2" Command="ScrollBar.LineRightCommand" IsEnabled="{TemplateBinding IsMouseOver}" Visibility="Hidden">
    <RepeatButton.Style>
    <Style TargetType="{x:Type RepeatButton}">
    <Setter Property="FocusVisualStyle">
    <Setter.Value>
    <Style>
    <Setter Property="Control.Template">
    <Setter.Value>
    <ControlTemplate>
    <Rectangle Margin="2" SnapsToDevicePixels="True" Stroke="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
    </ControlTemplate>
    </Setter.Value>
    </Setter>
    </Style>
    </Setter.Value>
    </Setter>
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="HorizontalContentAlignment" Value="Center"/>
    <Setter Property="VerticalContentAlignment" Value="Center"/>
    <Setter Property="Padding" Value="1"/>
    <Setter Property="Focusable" Value="False"/>
    <Setter Property="IsTabStop" Value="False"/>
    <Setter Property="Template">
    <Setter.Value>
    <ControlTemplate TargetType="{x:Type RepeatButton}">
    <Border x:Name="border" BorderBrush="#FFF0F0F0" BorderThickness="1" Background="#FFF0F0F0" SnapsToDevicePixels="True">
    <ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentStringFormat="{TemplateBinding ContentStringFormat}" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
    </Border>
    <ControlTemplate.Triggers>
    <Trigger Property="IsMouseOver" Value="True">
    <Setter Property="Background" TargetName="border" Value="#FFDADADA"/>
    <Setter Property="BorderBrush" TargetName="border" Value="#FFDADADA"/>
    </Trigger>
    <Trigger Property="IsPressed" Value="True">
    <Setter Property="Background" TargetName="border" Value="#FF606060"/>
    <Setter Property="BorderBrush" TargetName="border" Value="#FF606060"/>
    </Trigger>
    <Trigger Property="IsEnabled" Value="False">
    <Setter Property="Opacity" TargetName="contentPresenter" Value="0.56"/>
    <Setter Property="Background" TargetName="border" Value="#FFF0F0F0"/>
    <Setter Property="BorderBrush" TargetName="border" Value="#FFF0F0F0"/>
    </Trigger>
    </ControlTemplate.Triggers>
    </ControlTemplate>
    </Setter.Value>
    </Setter>
    </Style>
    </RepeatButton.Style>
    <Path x:Name="ArrowRight" Data="M1.81,7C1.81,7 0,7 0,7 0,7 3.18,3.5 3.18,3.5 3.18,3.5 0,0 0,0 0,0 1.81,0 1.81,0 1.81,0 5,3.5 5,3.5 5,3.5 1.81,7 1.81,7z" Fill="#FF606060" Margin="3" Stretch="Uniform"/>
    </RepeatButton>
    </Grid>
    <ControlTemplate.Triggers>
    <MultiDataTrigger>
    <MultiDataTrigger.Conditions>
    <Condition Binding="{Binding IsMouseOver, ElementName=PART_LineRightButton}" Value="true"/>
    <Condition Binding="{Binding IsPressed, ElementName=PART_LineRightButton}" Value="true"/>
    </MultiDataTrigger.Conditions>
    <Setter Property="Fill" TargetName="ArrowRight" Value="White"/>
    </MultiDataTrigger>
    <MultiDataTrigger>
    <MultiDataTrigger.Conditions>
    <Condition Binding="{Binding IsMouseOver, ElementName=PART_LineLeftButton}" Value="true"/>
    <Condition Binding="{Binding IsPressed, ElementName=PART_LineLeftButton}" Value="true"/>
    </MultiDataTrigger.Conditions>
    <Setter Property="Fill" TargetName="ArrowLeft" Value="White"/>
    </MultiDataTrigger>
    <MultiDataTrigger>
    <MultiDataTrigger.Conditions>
    <Condition Binding="{Binding IsMouseOver, ElementName=PART_LineRightButton}" Value="true"/>
    <Condition Binding="{Binding IsPressed, ElementName=PART_LineRightButton}" Value="false"/>
    </MultiDataTrigger.Conditions>
    <Setter Property="Fill" TargetName="ArrowRight" Value="Black"/>
    </MultiDataTrigger>
    <MultiDataTrigger>
    <MultiDataTrigger.Conditions>
    <Condition Binding="{Binding IsMouseOver, ElementName=PART_LineLeftButton}" Value="true"/>
    <Condition Binding="{Binding IsPressed, ElementName=PART_LineLeftButton}" Value="false"/>
    </MultiDataTrigger.Conditions>
    <Setter Property="Fill" TargetName="ArrowLeft" Value="Black"/>
    </MultiDataTrigger>
    <Trigger Property="IsEnabled" Value="False">
    <Setter Property="Fill" TargetName="ArrowLeft" Value="#FFBFBFBF"/>
    <Setter Property="Fill" TargetName="ArrowRight" Value="#FFBFBFBF"/>
    </Trigger>
    </ControlTemplate.Triggers>
    </ControlTemplate>
    How can I draw a dashed line and where?!
    tnx

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