Extract video frames display time and frame number

Question

I am trying to write a test for the following Nuxt 3 composable (useLinkToSlug).

import { computed } from 'vue';

export default function () {
    const route = useRoute();
    return computed(() => route?.params?.slug ? `/${route.params.slug}` : undefined);
}

To keep the code as lean as possible, I tried to mock the vue-router module and set the return of useRoute() manually.

My test looks like this:

import { vi, it, expect, describe } from 'vitest';

import useLinkToSlug from '~~/composables/useLinkToSlug';

describe('useLinkToSlug', () => {
    it('should return link to slug', () => {
        vi.mock('vue-router', () => ({
            useRoute: () => ({ params: { slug: 'abc' } })
        }));

        const link = useLinkToSlug();

        expect(link.value).toEqual('/abc');
    });

    it('should return null', () => {
        vi.mock('vue-router', () => ({
            useRoute: () => ({ params: { slug: undefined } })
        }));

        const link = useLinkToSlug();

        expect(link.value).toBeNull();
    });
});

The first one succeeds, but the later one fails, with:

AssertionError: expected '/abc' to be null

I don't get why and what to do, to make this work.

Using: Nuxt3 with Vitest

Solution

Try filter showinfo. Seems like it's what you need. Example:

ffmpeg -i 1.ts -vf "showinfo" -f null /dev/null

Comments

[stib]

When you say extract, do you mean to save the frame as an image?