Hello, when running the following ffmpeg chain I can't set the output psudo device (/dev/video1) format. What am I doing wrong? best steven
error message: [v4l2 @ 0x55e5418ddee0] Unknown V4L2 pixel format equivalent for yuva420p Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument Error initializing output stream 0:0 -- command line: ffmpeg -i Pictures/city.png -i /dev/video0 -filter_complex '[1:v]colorkey=blue:.2:0.0[ckout];[0:v][ckout]overlay[out]' -map '[out]' -f v4l2 /dev/video1 steven@honshu:~/src/v4l2loopback$ modinfo v4l2loopback filename: /lib/modules/4.15.0-20-generic/extra/v4l2loopback.ko license: GPL author: Vasily Levin, IOhannes m zmoelnig <zmoel...@iem.at>,Stefan Diewald,Anton Novikovet al. description: V4L2 loopback video device srcversion: F970FD08DB80D838C18FFD7 depends: videodev retpoline: Y name: v4l2loopback vermagic: 4.15.0-20-generic SMP mod_unload parm: debug:debugging level (higher values == more verbose) (int) parm: max_buffers:how many buffers should be allocated (int) parm: max_openers:how many users can open loopback device (int) parm: devices:how many devices should be created (int) parm: video_nr:video device numbers (-1=auto, 0=/dev/video0, etc.) (array of int) parm: card_label:card labels for every device (array of charp) parm: exclusive_caps:whether to announce OUTPUT/CAPTURE capabilities exclusively or not (array of bool) parm: max_width:maximum frame width (int) module installed from github source with last commit: commit f998233aafa92a268a91929705e1b453b98f1b9d (HEAD -> master, origin/master, origin/HEAD) Author: IOhannes m zmölnig <zmoel...@umlauts.umlaeute.mur.at> Date: Thu Nov 15 21:52:38 2018 +0100 Distributor ID: LinuxMint Description: Linux Mint 19.1 Tessa Release: 19.1 Codename: tessa _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".