How to show a subtitle in only one frame in Avisynth?

[ziptip]

I have the following script in Avisynth. It generates two frames with two subtitles. One subtitle changes the text and the second subtitle is shown in both frames, unchanged. What I need is to show the second subtitle (ABC) only in the first frame. How can I do that?

BlankClip(width=640, height=360, length=1, fps=1, color=$FFFFFF)
Subtitle("123", size=100, x=320, y=290, align=2, text_color=$0000ff) \
++ Subtitle("456", size=100, x=320, y=290, align=2, text_color=$0000ff)
Subtitle("ABC", size=100, x=620, y=360, align=3, text_color=$000000)

I am using Avisynth+ 3.7 on Windows 8.1 64 bit

[poisondeathray]

One way is to make 2 different frames (exclude "ABC" from the 2nd), then splice (append temporally)

BlankClip(width=640, height=360, length=1, fps=1, color=$FFFFFF)
Subtitle("123", size=100, x=320, y=290, align=2, text_color=$0000ff)
Subtitle("ABC", size=100, x=620, y=360, align=3, text_color=$000000)
a=last

BlankClip(width=640, height=360, length=1, fps=1, color=$FFFFFF)
Subtitle("456", size=100, x=320, y=290, align=2, text_color=$0000ff)
b=last

a+b

[ziptip]

Thank you, it works.
But what can I do when I have 30 such frames? Some of them have a second line and some of them don't have it. Should I keep defining variables c,d,e,f etc?

[poisondeathray]

It's just one way to approach this problem. You can use other names for variables if you want to - often descriptive names can help with organization

There might be some simpler way, if you had some overlap or similar text, but none of the text is the same between your 2 frames in that example


Other options are video editors, NLE's . Many people feel it's easier to work in a GUI based NLE

[jagabo]

Make yourself a little function that appends a frame with two optional subs, then call as wanted:

function AppendSubs(clip v, string "sub1", string "sub2")
{
    BlankClip(v, length=1, color=$FFFFFF)
    Subtitle(sub1, size=100, x=320, y=290, align=2, text_color=$0000ff)
    Subtitle(sub2, size=100, x=620, y=360, align=3, text_color=$000000)

    v+last
}

BlankClip(width=640, height=360, length=1, fps=1, color=$FFFFFF)
AppendSubs(last, "AAA", "111") # show both subs
AppendSubs(last, "BBB", "") # show only the first sub
AppendSubs(last, "", "333") # show only the second sub
AppendSubs(last, "", "") # show no subs

[ziptip]

Awesome, thanks a lot!
I find Avisynth much better for such tasks than NLE editors