Build with patches is OK. render with DPX.dpx: [...] file: /home/paz/puppa/aereo_test.dpx err: Invalid argument FFMPEG::mux_video err: Operation not permitted FFStream::write_packet: write packet failed. file:/home/paz/puppa/aereo_test.dpx err: Invalid argument FFStream::encode_frame: encode failed. file: /home/paz/puppa/aereo_test.dpx err: Invalid argument FFMPEG::mux_video err: Operation not permitted Render::render_single: Session finished. ** rendered 4726 frames in 41.222 secs, 114.648 fps The resulting file is 11 MB, but it won't open in mpv or ffplay. I think it only renders the first frame. Render with mpeg2_hq.mpeg (4:2:2): everything is ok. File is OK. Gif: I'm not quite sure what to do. A render with gif.gif is OK. It's one of those days when I'm feeling confused; I don't think I can be of any help.