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• Xubuntu ffmpeg screen capturing very slow when no display connected

  8 décembre 2022, par fre_der

  I use ffmpeg on an Intel Nuc with Xubuntu 22.04 (XFCE4, lightdm), with x11grab for screen capturing the desktop, and sending output to a multicast UDP stream (which is shown on different IPTV sets in the network).
The system uses autologin, and autostarts Firefox in kiosk mode, rendering a html5 video.

  


  Everything works fine when a display is attached, but from the moment the hdmi cable is detached, the output video is extremely slow (very shaky, looks like 1 fps, audio is OK although it has occasional hickups).

  


  CPU and memory usage doesn't seem to be affected whether a display is attached or not.

  


  This runs fine on Xubuntu 18.04, although there might be small config changes that I'm not aware of.

  


  To be able to display output when no display is attached, I created a VIRTUAL1 display :

  


  xrandr -d :0 --verbose --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
xrandr -d :0 --verbose --addmode VIRTUAL1 "1920x1080_60.00"


  


  my /usr/share/X11/xorg.conf.d/20-intel.conf looks like :

  


  Section "Device"
  Identifier "Intel Graphics"
  Driver "intel"
  Option "VirtualHeads" "1"
  Option "TearFree" "true"
  Option "TripleBuffer" "true"
  Option "DRI" "false"
EndSection


  


  The ffmpeg command :

  


  ffmpeg -r 25 -thread_queue_size 512 -f x11grab -s 1920x1080 -i :0 -thread_queue_size 512 -f alsa -i default -c:a mp2 -f mpegts udp://239.255.255.8:50000?pkt_size=1316


  


  (during trial/error I tested various ffmpeg command line options to no avail)

  


  Output with hdmi cable attached :

  


  ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libaribb24 --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc --enable-libsmbclient
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[x11grab @ 0x55f1fdfa18c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0':
  Duration: N/A, start: 1670501458.257764, bitrate: 1658880 kb/s
  Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1658880 kb/s, 25 fps, 1000k tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1670501459.560180, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp2 (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'udp://239.255.255.8:50000?pkt_size=1316':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 1920x1080, q=2-31, 200 kb/s, 25 fps, 90k tbn
    Metadata:
      encoder         : Lavc58.134.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
    Metadata:
      encoder         : Lavc58.134.100 mp2
frame= 1041 fps= 25 q=31.0 Lsize=   12451kB time=00:00:41.56 bitrate=2454.3kbits/s speed=1.01x
video:9955kB audio:1920kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.847125%
Exiting normally, received signal 2.


  


  Output without hdmi cable attached :

  


  ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libaribb24 --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc --enable-libsmbclient
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[x11grab @ 0x56325816a8c0] Stream #0: not enough frames to estimate rate; consider increasing probesize
Input #0, x11grab, from ':0':
  Duration: N/A, start: 1670501334.907900, bitrate: 1658880 kb/s
  Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1658880 kb/s, 25 fps, 1000k tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, alsa, from 'default':
  Duration: N/A, start: 1670501336.193971, bitrate: 1536 kb/s
  Stream #1:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> mp2 (native))
Press [q] to stop, [?] for help
Output #0, mpegts, to 'udp://239.255.255.8:50000?pkt_size=1316':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, progressive), 1920x1080, q=2-31, 200 kb/s, 25 fps, 90k tbn
    Metadata:
      encoder         : Lavc58.134.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
  Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16, 384 kb/s
    Metadata:
      encoder         : Lavc58.134.100 mp2
frame= 1020 fps= 26 q=31.0 Lsize=   11802kB time=00:00:40.72 bitrate=2374.3kbits/s speed=1.02x
video:9378kB audio:1873kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.892235%
Exiting normally, received signal 2.


  


  xrandr output with display connected (if no display connected then DP1 just says disconnected as the other outputs)

  


  Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 530mm x 300mm
   1920x1080     60.00*+  74.97    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x960      60.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    70.07    60.00
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
DP4 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1920x1080_60.00  59.96*
VIRTUAL2 disconnected (normal left inverted right x axis y axis)


  


• FFMPEG Without Headers is Causing Video To Be Height 0X0

  21 novembre 2022, par Devin Dixon

  I am grabbing a stream from X11 and streaming it to other sources like Node Media Server and Twitch. Except, I get audio only with no video and the resolution size says 0X0.

  


  My ffmpeg is command is this :

  


   /usr/bin/ffmpeg -hide_banner -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 -video_size 1920x1080 -y -v info -f x11grab -draw_mouse 0 -r 60 -s 1920x1080 -thread_queue_size 14000 -i :0.0+0,0 -f alsa -thread_queue_size 14000 -i plug:bsnoop -acodec aac -strict -2 -ar 44100 -b:a 128k -af aresample=async=1 -c:v h264_vaapi -vf format=nv12,hwupload,scale_vaapi=w=1920:h=1080 -attempt_recovery 1 -max_recovery_attempts 2 -drop_pkts_on_overflow 1 -video_size 1920x1080 -crf 19 -preset medium -maxrate 14000k -bufsize 14000k -r 60 -crf 25 -g 120 -tune zerolatency -f flv rtmp://[some_other_source]


  


  The ffmpeg output is as follows :

  


  2022-11-21 13:42:45.527 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 (rtmp://[some_other_sorce]) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
2022-11-21 13:42:45.527 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Codec AVOption tune (The metric that the encoder tunes for. Automatically chosen by the encoder by default) specified for output file #0 (rtmp://[some_other_source]) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
2022-11-21 13:42:45.527 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Codec AVOption preset (Encoding preset) specified for output file #0 (rtmp://relay.bingewave.com/live/e3057272-271d-40d5-90d1-f9065c5dfa37-broadcast?sign=1669642928-17aa73baeaedaad786140b5b2cca9d2b) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
2022-11-21 13:42:45.527 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Codec AVOption preset (Encoding preset) specified for output file #1 (rtmp://127.0.0.1:1935/live/e3057272-271d-40d5-90d1-f9065c5dfa37-broadcast?sign=1669642928-17aa73baeaedaad786140b5b2cca9d2b) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
2022-11-21 13:42:45.527 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Codec AVOption tune (The metric that the encoder tunes for. Automatically chosen by the encoder by default) specified for output file #1 (rtmp://127.0.0.1:1935/live/['for_reording']) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Codec AVOption crf (Select the quality for constant quality mode) specified for output file #1 (rtmp://127.0.0.1:1935/live/e3057272-271d-40d5-90d1-f9065c5dfa37-broadcast?sign=1669642928-17aa73baeaedaad786140b5b2cca9d2b) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Stream mapping:
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_vaapi))
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #0:0 -> #1:0 (rawvideo (native) -> h264 (h264_vaapi))
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #1:0 -> #1:1 (pcm_s16le (native) -> mp3 (libmp3lame))
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Press [q] to stop, [?] for help
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df06980] No quality level set; using default (20).
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df06980] Buffering settings are ignored in CQP RC mode.
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df06980] Driver does not support some wanted packed headers (wanted 0xd, found 0).
2022-11-21 13:42:45.550 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df06980] Driver does not support packed sequence headers, but a global header is requested.
2022-11-21 13:42:45.583 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df06980] No global header will be written: this may result in a stream which is not usable for some purposes (e.g. not muxable to some containers).
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df0a700] Driver does not support some wanted packed headers (wanted 0xd, found 0).
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df0a700] Driver does not support packed sequence headers, but a global header is requested.
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [h264_vaapi @ 0x55a02df0a700] No global header will be written: this may result in a stream which is not usable for some purposes (e.g. not muxable to some containers).
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Output #0, flv, to 'rtmp://relay.bingewave.com/live/[some_other_source]':
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Metadata:
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:     encoder         : Lavf59.27.100
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #0:0: Video: h264 (High) ([7][0][0][0] / 0x0007), vaapi(tv, progressive), 1920x1080, q=2-31, 60 fps, 1k tbn
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:     Metadata:
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:       encoder         : Lavc59.37.100 h264_vaapi
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:     Metadata:
2022-11-21 13:42:45.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:       encoder         : Lavc59.37.100 aac
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: Output #1, flv, to 'rtmp://127.0.0.1:1935/live/e3057272-271d-40d5-90d1-f9065c5dfa37-broadcast?sign=1669642928-17aa73baeaedaad786140b5b2cca9d2b':
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Metadata:
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:     encoder         : Lavf59.27.100
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #1:0: Video: h264 (High) ([7][0][0][0] / 0x0007), vaapi(tv, progressive), 1920x1080, q=2-31, 15000 kb/s, 60 fps, 1k tbn
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:     Metadata:
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:       encoder         : Lavc59.37.100 h264_vaapi
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:   Stream #1:1: Audio: mp3 ([2][0][0][0] / 0x0002), 48000 Hz, stereo, s16p
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:     Metadata:
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42:       encoder         : Lavc59.37.100 libmp3lame
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: frame=    1 fps=0.0 q=-0.0 q=-0.0 size=       7kB time=00:00:00.06 bitrate= 875.5kbits/s speed=1.31x    
2022-11-21 13:42:46.584 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: frame=   31 fps=0.0 q=-0.0 q=-0.0 size=     281kB time=00:00:00.55 bitrate=4133.2kbits/s speed=1.01x    
2022-11-21 13:42:47.325 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: frame=   60 fps= 57 q=-0.0 q=-0.0 size=     546kB time=00:00:01.18 bitrate=3774.7kbits/s speed=1.12x    
2022-11-21 13:42:47.325 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: frame=   91 fps= 58 q=-0.0 q=-0.0 size=     828kB time=00:00:01.69 bitrate=4003.3kbits/s speed=1.08x    
2022-11-21 13:42:47.325 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [flv @ 0x55a02df10e00] Failed to update header with correct duration.
2022-11-21 13:42:47.325 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [flv @ 0x55a02df10e00] Failed to update header with correct filesize.
2022-11-21 13:42:47.325 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [flv @ 0x55a02df15500] Failed to update header with correct duration.
2022-11-21 13:42:47.325 INFO: [658] LoggingUtils$Companion$OutputLogger$1.invoke$lambda-0#42: [flv @ 0x55a02df15500] Failed to update header with correct filesize.


  


  I've noticed there are several errors the headers going out. For VAAPI, how do I set resolution header ?

  


• Desktop grabbing with FFmpeg at 60 fps using NVENC codec

  5 juillet 2016, par Akatosh

  I’m having trouble recording my desktop at 60FPS using the latest Windows compiled FFmpeg with NVENC codec. Metadata says the file is 60 fps but when I play it, I can see clearly see it is not 60FPS.

  The command-line I use is the following :

  ffmpeg -y -rtbufsize 2000M -f gdigrab -framerate 60 -offset_x 0 -offset_y 0 -video_size 1920x1080 -i desktop -c:v h264_nvenc -preset:v fast -pix_fmt nv12 out.mp4

  I tried using a real time buffer, using another DirectShow device, changing the profile or forcing a bitrate, but the video always seems to be at 30fps.

  Recording the screen using NVIDIA’s ShadowPlay works well, so I know it’s feasible on my machine.

  Using FFprobe to check the ShadowPlay’s output file I can see :

  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv,
  smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 4573 kb/s,
  59.38 fps, 240 tbr, 60k tbn, 120 tbc (default)

  But If I force my output to have the same bitrate and profile I get :

  Stream #0:0(und) : Video : h264 (High) (avc1 / 0x31637661), yuv420p,
  1920x1080 [SAR 1:1 DAR 16:9], 5519 kb/s, 60 fps, 60 tbr, 15360 tbn,
  120 tbc (default)

  I can see tbr and tbn are different, so I know my output is duplicating frames.

  For testing, all of my recordings had this 60 frame rate test page on the background, and I could clearly see the differences.

  I know ShadowPlay probably does a lot more under the hood than FFmpeg using the same codec. I know OBS can do it quite easily but I want to understand what I am doing wrong. Maybe it’s some FFmpeg limitation ?

  Full console output

  Using -v trace command :

  [gdigrab @ 0000000002572cc0] Capturing whole desktop as 1920x1080x32 at (0,0)
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
  
  [gdigrab @ 0000000002572cc0] Probe buffer size limit of 5000000 bytes reached
  
  [gdigrab @ 0000000002572cc0] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  [gdigrab @ 0000000002572cc0] stream 0: start_time: 1467123648.275 duration: -9223372036854.775
  
  [gdigrab @ 0000000002572cc0] format: start_time: 1467123648.275 duration: -9223372036854.775 bitrate=3981337 kb/s
  
  Input #0, gdigrab, from 'desktop':
  
    Duration: N/A, start: 1467123648.275484, bitrate: 3981337 kb/s
  
      Stream #0:0, 1, 1/1000000: Video: bmp, 1 reference frame, bgra, 1920x1080 (0x0), 0/1, 3981337 kb/s, 60 fps, 1000k tbr, 1000k tbn, 1000k tbc
  
  Successfully opened the file.
  
  Parsing a group of options: output file out.mp4.
  
  Applying option c:v (codec name) with argument h264_nvenc.
  
  Applying option pix_fmt (set pixel format) with argument nv12.
  
  Successfully parsed a group of options.
  
  Opening an output file: out.mp4.
  
  [file @ 0000000000e3a7c0] Setting default whitelist 'file,crypto'
  
  Successfully opened the file.
  
  detected 8 logical cores
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'video_size' to value '1920x1080'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'pix_fmt' to value '30'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'time_base' to value '1/1000000'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'pixel_aspect' to value '0/1'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] Setting 'frame_rate' to value '60/1'
  
  [graph 0 input from stream 0:0 @ 000000000257ec00] w:1920 h:1080 pixfmt:bgra tb:1/1000000 fr:60/1 sar:0/1 sws_param:flags=2
  
  [format @ 000000000257ffc0] compat: called with args=[nv12]
  
  [format @ 000000000257ffc0] Setting 'pix_fmts' to value 'nv12'
  
  [auto-inserted scaler 0 @ 00000000025802c0] Setting 'flags' to value 'bicubic'
  
  [auto-inserted scaler 0 @ 00000000025802c0] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 000000000257ffc0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [AVFilterGraph @ 0000000000e373c0] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
  
  [auto-inserted scaler 0 @ 00000000025802c0] w:1920 h:1080 fmt:bgra sar:0/1 -> w:1920 h:1080 fmt:nv12 sar:0/1 flags:0x4
  
  [h264_nvenc @ 0000000000e3ca20] Nvenc initialized successfully
  
  [h264_nvenc @ 0000000000e3ca20] 1 CUDA capable devices found
  
  [h264_nvenc @ 0000000000e3ca20] [ GPU #0 - < GeForce GTX 670 > has Compute SM 3.0 ]
  
  [h264_nvenc @ 0000000000e3ca20] supports NVENC
  
  [mp4 @ 0000000000e3b580] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      encoder         : Lavf57.40.101
  
      Stream #0:0, 0, 1/15360: Video: h264 (h264_nvenc) (Main), 1 reference frame ([33][0][0][0] / 0x0021), nv12, 1920x1080, 0/1, q=-1--1, 2000 kb/s, 60 fps, 15360 tbn, 60 tbc
  
      Metadata:
  
        encoder         : Lavc57.47.100 h264_nvenc
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (bmp (native) -> h264 (h264_nvenc))
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  Clipping frame in rate conversion by 0.000008
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
  
  *** 35 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,750) -> (1842,741)
  
  *** 7 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1850,649) -> (1850,649)
  
  *** 1 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1858,535) -> (1858,535)
  
  *** 3 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1859,454) -> (1859,454)
  
  *** 2 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1865,384) -> (1865,384)
  
  *** 2 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1846,348) -> (1846,348)
  
  *** 3 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1770,347) -> (1770,347)
  
  *** 2 dup!
  
  [gdigrab @ 0000000002572cc0] Cursor pos (1545,388) -> (1545,388)
  
  *** 4 dup!
  
  frame=   69 fps=0.0 q=35.0 size=     184kB time=00:00:00.63 bitrate=2384.0kbits/[gdigrab @ 0000000002572cc0] Cursor pos (1523,389) -> (1519,378)