Troubleshooting • Can't use libx264 with ffmpeg

ffmpeg -f lavfi -i testsrc=size=640x480:rate=5 \
-vf format=yuv420p \
-c:v libx264 -preset ultrafast -tune zerolatency \
-b:v 500k -g 25 \
-f rtsp -rtsp_transport tcp \
rtsp://my_host:8554/live

ffmpeg version 7.1.3-0+deb13u1+rpt1 Copyright (c) 2000-2025 the FFmpeg developers
built with gcc 14 (Debian 14.2.0-19)
configuration: --prefix=/usr --extra-version=0+deb13u1+rpt1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-libmfx --disable-mmal --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --disable-libvpl --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-vout-drm --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sand --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
libavutil 59. 39.100 / 59. 39.100
libavcodec 61. 19.101 / 61. 19.101
libavformat 61. 7.100 / 61. 7.100
libavdevice 61. 3.100 / 61. 3.100
libavfilter 10. 4.100 / 10. 4.100
libswscale 8. 3.100 / 8. 3.100
libswresample 5. 3.100 / 5. 3.100
libpostproc 58. 3.100 / 58. 3.100
Input #0, lavfi, from 'testsrc=size=640x480:rate=5':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: wrapped_avframe, rgb24, 640x480 [SAR 1:1 DAR 4:3], 5 fps, 5 tbr, 5 tbn
Stream mapping:
Stream #0:0 -> #0:0 (wrapped_avframe (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x555622ba4940] using SAR=1/1
[libx264 @ 0x555622ba4940] using cpu capabilities: ARMv8 NEON
[libx264 @ 0x555622ba4940] profile Constrained Baseline, level 2.2, 4:2:0, 8-bit
[libx264 @ 0x555622ba4940] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=4 sliced_threads=1 slices=4 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=25 keyint_min=2 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, rtsp, to 'rtsp://my_host:8554/live':
Metadata:
encoder : Lavf61.7.100
Stream #0:0: Video: h264, yuv420p(tv, progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 500 kb/s, 5 fps, 90k tbn
Metadata:
encoder : Lavc61.19.101 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/500000 buffer size: 0 vbv_delay: N/A

**** INSTANT CRASH ****

Statistics: Posted by VincentDM2 — Fri Feb 13, 2026 3:18 pm — Replies 4 — Views 85