Export fragments list with ism and f4m protocols

[wiiaboo]

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Like it's possible now with mpd/dash manifests right now, would it be possible to export ism/f4m fragments list with JSON output? FFmpeg/mpv doesn't demuxing the manifests directly.

[yan12125]

Fragment URLs are not intended for external use. In the long term, segment URLs of DASH will be removed as it blocks supporting live streams. See #9109.

[dstftw]

Actually, fragments interface has been introduced in #10567 in reply to #10554 for exactly this reason - external usage. And I don't think it should be removed.