[FFmpeg-user] (de)-interlacing question

[Moritz Barsnick]

On Wed, Nov 23, 2016 at 19:54:56 +0100, Toerless Eckert wrote:
> Well, i'd assume they reduce the effective framerate to 25 to get lower
> bitrate, and they duplicate to get better player compatibility ?

I don't see which players should have a low compatibility with 25 fps.

> > Input #0, hls,applehttp, from 'http://hls.tagesschau.de/i/video/2016/1122/TV-20161122-2026-4701.,webs,websm,webm,webml,webl,webxl,.h264.mp4.csmil/index_5_av.m3u8':
> 
> ... Which program do you use for this output ?

ffmpeg, obviously. :) In this case, I actively used youtube-dl, and it
passes the HLS playlist URL to ffmpeg (in case of segmented MPEG-TS, I
believe - they have an internal HLS desegmenter for some other formats).

(youtube-dl is currenty broken for the new ZDF Mediathek. Bummer.)

> Aka: Don't see anything that would indicate frame duplication, so
> all i can do is trust the step by step playback from vlc or mplayer.

Of course. No actually, if you don't really trust the player (and/or
its demuxer), but you do trust ffmpeg, you can have ffmpeg dump the
*actual* decoded input frames to single output images.

Moritz