# Contact map movie **URL:** \ **Category:** User discussions\ **Created:** [December 13, 2020, 6:22pm UTC](https://gromacs.bioexcel.eu/t/contact-map-movie/1248 "2020-12-13T18:22:06Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mattyboi](https://avatars.discourse-cdn.com/v4/letter/m/85f322/32.png) [@mattyboi](https://gromacs.bioexcel.eu/u/mattyboi)\ **Post date:** [December 13, 2020, 6:22pm UTC](https://gromacs.bioexcel.eu/t/contact-map-movie/1248/1 "2020-12-13T18:22:06Z")
GROMACS version:2019.4 GROMACS modification: No Here post your question Hello gromacs users, is there a simple way to make gmx hbond output a contact matrix for every n frames that can then be viewed as a movie? ie my trajectory has 1000 frames, I want to know how the h bonding or van der waals contact patter nchanges over the course of the trajectory so I want 100 contact maps containing the H bonds in each consecutive ten frame blocks? ---
**Author:** ![Masrul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/masrul/32/234_2.png) [@Masrul](https://gromacs.bioexcel.eu/u/Masrul)\ **Post date:** [December 13, 2020, 11:38pm UTC](https://gromacs.bioexcel.eu/t/contact-map-movie/1248/2 "2020-12-13T23:38:59Z")
You can make contact map for each frame as image file, then from image files make movie using tools such ImageMagick, ffmpeg. ---
**Author:** ![mattyboi](https://avatars.discourse-cdn.com/v4/letter/m/85f322/32.png) [@mattyboi](https://gromacs.bioexcel.eu/u/mattyboi)\ **Post date:** [December 14, 2020, 12:00am UTC](https://gromacs.bioexcel.eu/t/contact-map-movie/1248/3 "2020-12-14T00:00:38Z")
HI Masrul, I would recommend ConAn if yo uwant to do anythign similar. I had found it before but I hadn’t bee nable to use it easily because of an IT issue now resolved. thanks for your suggestion though I will remember it for occasional quick use