[FFmpeg-user] (de)-interlacing question

[Toerless Eckert]

On Wed, Nov 23, 2016 at 11:30:55AM +0100, Moritz Barsnick wrote:
> > the mediaportal H264 mp4 file is 720p50 but actually 720p25 with
> > duplicated frames,
> 
> I never noticed that. :-/ (Why would they duplicate them?) I don't have
> any "true 50 fps" show to check right now. A random ARD Mediathek
> archive file (yesterday's Tagesschau) shows this:

Well, i'd assume they reduce the effective framerate to 25 to get lower
bitrate, and they duplicate to get better player compatibility ? 

> 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 ?

I downloaded with MediathekView, so i got non-hls.

Also shows probably the same with ffprobe:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'zdf.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isom
    creation_time   : 2016-11-15 09:18:01
  Duration: 00:28:30.04, start: 0.000000, bitrate: 3776 kb/s
    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 3582 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    Metadata:
      creation_time   : 2016-11-15 09:18:01
      handler_name    : MP4 Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(deu): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    Metadata:
      ...

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.

> > and the MPEG2 SD TS from Astra is 720i50.
> 
> 576i50 I assume.

Right

Toerless

> Moritz
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> 
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".