25fps vs 50fps difference is there but not so great as I expected. You might find that ffmpeg is duplicating each deinterlaced frame to output 50fps from the 25fps source. If you use yadif filter and configure to output a frame per field of interlaced source the resulting motion is dramatically improved at the expense of vertical resolution. Depending on the content type this option might be preferable.
Thanks Adam > On 13 Nov 2020, at 19:40, Carl Eugen Hoyos <ceffm...@gmail.com> wrote: > > Am Fr., 13. Nov. 2020 um 10:44 Uhr schrieb Matti Haveri > <matti.hav...@gmail.com>: >> >> On Thu, Nov 12, 2020 at 11:39 PM Carl Eugen Hoyos <ceffm...@gmail.com> >> wrote: >> >>>> I guess it is better to deinterlace first, then scale? >>> >>> This is correct. >> >> I tested to scale & crop first, and then deinterlace, and to my surprise >> the output was identical. > > While it may look similar (because only horizontal scaling was done), > I don't think the output was identical. > Both scaling and deinterlacing cannot be undone and do have an > impact on quality (if you define quality as identity with a - possibly > hypothetical - original). > I can understand why you want to deinterlace, you should avoid > the scaling (unless I miss something and you absolutely have to > do it). > > Carl Eugen > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
