Re: [FFmpeg-user] filters zoompan and crop

2018-11-01 Thread Jim DeLaHunt
On 2018-11-01 15:02, S Andreason wrote: Jim DeLaHunt wrote: . I want to generate an overlay to zoom in, have the input png start small, and grow to half the video size, like from 20 to 320 in width. Starting the zoompan at z=0.1 does not seem to work. Take a look at the *pad* filter

Re: [FFmpeg-user] filters zoompan and crop

2018-11-01 Thread S Andreason
Jim DeLaHunt wrote: . I want to generate an overlay to zoom in, have the input png start small, and grow to half the video size, like from 20 to 320 in width. Starting the zoompan at z=0.1 does not seem to work. Take a look at the *pad* filter . That

Re: [FFmpeg-user] filters zoompan and crop

2018-10-29 Thread Jim DeLaHunt
On 2018-10-29 01:38, Paul B Mahol wrote: On 10/29/18, Jim DeLaHunt wrote: My experience with the *zoompan* filter is that the /in/ parameter (input frame number) is 2 for the first frame, rather than 0 as is usual for ffmpeg. I think that this is partly a bug (see

Re: [FFmpeg-user] filters zoompan and crop

2018-10-29 Thread Jim DeLaHunt
On 2018-10-28 23:15, Gyan wrote: On Mon, Oct 29, 2018 at 11:38 AM Jim DeLaHunt wrote: A zoom argument of /k/ is interpreted as if the input image was drawn /k /times its original size, or equivalently, that the output image is 1//k/ the size of the input image. That should be k^2. A

Re: [FFmpeg-user] filters zoompan and crop

2018-10-29 Thread Paul B Mahol
On 10/29/18, Jim DeLaHunt wrote: > On 2018-10-26 11:57, S Andreason wrote: >> Hi, >> >> Does zoompan not work outside the range 1 .. 8? >> > Nearly correct. The zoompan filter accepts values for the zoom parameter > between 1 and 10. Any values below 1.0 are set to 1; any values greater > than

Re: [FFmpeg-user] filters zoompan and crop

2018-10-29 Thread Gyan
On Mon, Oct 29, 2018 at 11:38 AM Jim DeLaHunt wrote: > > A zoom > argument of /k/ is interpreted as if the input image was drawn /k /times > its original size, or equivalently, that the output image is 1//k/ the > size of the input image. > That should be k^2. A zoom value of 2 crops a window

Re: [FFmpeg-user] filters zoompan and crop

2018-10-29 Thread Jim DeLaHunt
On 2018-10-26 11:57, S Andreason wrote: Hi, Does zoompan not work outside the range 1 .. 8? Nearly correct. The zoompan filter accepts values for the zoom parameter between 1 and 10. Any values below 1.0 are set to 1; any values greater than 10.0 are set to 10. Also, it's helpful to be