Hello, I'm struggling with FFMPEG to convert a specific camera stream with shitty format and non-deterministic framerate to RTSP endpoint as H264. I came up with this following command: ffmpeg -f mxg -probesize 32 -fflags nobuffer -i 'http://admin:admin@10.10.10.10/cgi-bin/faststream.jpg?stream=MxPEG&fps=25&jpheaderupdate=1' -vsync vfr -vf 'crop=iw/2:ih:0:0' -flags low_delay -preset ultrafast -vcodec libx264 -an -tune zerolatency -loglevel info -hide_banner -nostats -f rtsp rtsp://localhost::8554/7618 Producing the following output: [mxg @ 0x562ffddf1540] Stream #0: not enough frames to estimate rate; consider increasing probesize Input #0, mxg, from 'http://admin:ad@10.10.10.10/cgi-bin/faststream.jpg?stream=MxPEG&fps=25&jpheaderupdate=1': Duration: N/A, start: 1744980937.474607, bitrate: 64 kb/s Stream #0:0: Video: mxpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x480, 1000k tbr, 1000k tbn, 1000k tbc Stream #0:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s Stream mapping: Stream #0:0 -> #0:0 (mxpeg (native) -> h264 (libx264)) Press [q] to stop, [?] for help [libx264 @ 0x562ffddfb380] MB rate (1200000000) > level limit (16711680) [libx264 @ 0x562ffddfb380] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 [libx264 @ 0x562ffddfb380] profile Constrained Baseline, level 6.2, 4:2:0, 8-bit 2025/04/18 12:55:39 INF [RTSP] [conn 127.0.0.1:57966] opened 2025/04/18 12:55:39 INF [RTSP] [session 24e2616d] created by 127.0.0.1:57966 2025/04/18 12:55:39 INF [RTSP] [session 24e2616d] is publishing to path '7618', 1 track (H264) Output #0, rtsp, to 'rtsp://localhost:8554/7618': Metadata: encoder : Lavf58.45.100 Stream #0:0: Video: h264 (libx264), yuvj420p(pc), 640x480, q=-1--1, 1000k fps, 90k tbn, 1000k tbc Metadata: encoder : Lavc58.91.100 libx264 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A It runs fine, but I cannot read anything back from the target RTSP server. However, running the command with "-f mp4 /tmp/dump.mp4" produce a perfectly valid H264 file, with correct speed (i have timestamp superimposed in video). My guess is that there is a timestamp/framerate issue but I have no idea how to fix that. Can you point me to the correct direction ? Maybe ignore completely input framerate and generate clean native 25 fps for output ? Thanks in advance, Best regards, Adam.