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• how to record camera to file while encoding stream to v4l2-loopback device ?

  3 février 2021, par Jonatas

  So i have this logitech c920 camera 1920x1080 h264 capable and i would like to record the camera to file while at the same time copying/encoding the stream to a loopback device so the camera can be still used by other apps.
here is the code i got so far :

  


  ffmpeg -report -f alsa -i hw:CARD=C920,DEV=0 -r 1500 -s 1920x1080 -f v4l2 -vcodec h264 \
-i /dev/video1 -copyinkf -vcodec copy /home/jonatas/Videos/2021-02-01185658.mp4 \ 
-f v4l2 /dev/video0


  


  error :

  


  Unknown V4L2 pixel format equivalent for yuvj420p
Could not write header for output file #1 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 1:0 -- 


  


  some info on /dev/video0(loopbackdevice) :

  


  v4l2-ctl -d /dev/video0

    Device Caps      : 0x05208003
        Video Capture
        Video Output
        Video Memory-to-Memory
        Read/Write
        Streaming
        Extended Pix Format
Priority: 0
Video input : 0 (loopback: ok)
Video output: 0 (loopback in)
Format Video Output:
    Width/Height      : 1280/720
    Pixel Format      : 'YUYV' (YUYV 4:2:2)
    Field             : None
    Bytes per Line    : 2560
    Size Image        : 1843200
    Colorspace        : sRGB
    Transfer Function : Default (maps to sRGB)
    YCbCr/HSV Encoding: Default (maps to ITU-R 601)
    Quantization      : Default (maps to Limited Range)
    Flags             : 
Streaming Parameters Video Capture:
    Frames per second: 30.000 (30/1)
    Read buffers     : 8
Streaming Parameters Video Output:
    Frames per second: 30.000 (30/1)
    Write buffers    : 8

User Controls

                    keep_format 0x0098f900 (bool)   : default=0 value=0
              sustain_framerate 0x0098f901 (bool)   : default=0 value=0
                        timeout 0x0098f902 (int)    : min=0 max=100000 step=1 default=0 value=0
               timeout_image_io 0x0098f903 (bool)   : default=0 value=0


  


  some info on my camera in /dev/video1

  


  v4l2-ctl -d /dev/video1 --all
Driver Info:
    Driver name      : uvcvideo
    Card type        : HD Pro Webcam C920
    Bus info         : usb-0000:00:14.0-7.2
    Driver version   : 5.4.78
    Capabilities     : 0x84a00001
        Video Capture
        Metadata Capture
        Streaming
        Extended Pix Format
        Device Capabilities
    Device Caps      : 0x04200001
        Video Capture
        Streaming
        Extended Pix Format
Media Driver Info:
    Driver name      : uvcvideo
    Model            : HD Pro Webcam C920
    Serial           : EC6C336F
    Bus info         : usb-0000:00:14.0-7.2
    Media version    : 5.4.78
    Hardware revision: 0x00000011 (17)
    Driver version   : 5.4.78
Interface Info:
    ID               : 0x03000002
    Type             : V4L Video
Entity Info:
    ID               : 0x00000001 (1)
    Name             : HD Pro Webcam C920
    Function         : V4L2 I/O
    Flags         : default
    Pad 0x01000007   : 0: Sink
      Link 0x0200001f: from remote pad 0x100000a of entity 'Processing 3': Data, Enabled, Immutable
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
    Width/Height      : 1280/720
    Pixel Format      : 'H264' (H.264)
    Field             : None
    Bytes per Line    : 2560
    Size Image        : 1843200
    Colorspace        : sRGB
    Transfer Function : Default (maps to sRGB)
    YCbCr/HSV Encoding: Default (maps to ITU-R 601)
    Quantization      : Default (maps to Full Range)
    Flags             : 
Crop Capability Video Capture:
    Bounds      : Left 0, Top 0, Width 1280, Height 720
    Default     : Left 0, Top 0, Width 1280, Height 720
    Pixel Aspect: 1/1
Selection Video Capture: crop_default, Left 0, Top 0, Width 1280, Height 720, Flags: 
Selection Video Capture: crop_bounds, Left 0, Top 0, Width 1280, Height 720, Flags: 
Streaming Parameters Video Capture:
    Capabilities     : timeperframe
    Frames per second: 30.000 (30/1)
    Read buffers     : 0
                     brightness 0x00980900 (int)    : min=0 max=255 step=1 default=128 value=128
                       contrast 0x00980901 (int)    : min=0 max=255 step=1 default=128 value=128
                     saturation 0x00980902 (int)    : min=0 max=255 step=1 default=128 value=128
 white_balance_temperature_auto 0x0098090c (bool)   : default=1 value=1
                           gain 0x00980913 (int)    : min=0 max=255 step=1 default=0 value=255
           power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=2 value=2
                0: Disabled
                1: 50 Hz
                2: 60 Hz
      white_balance_temperature 0x0098091a (int)    : min=2000 max=6500 step=1 default=4000 value=3233 flags=inactive
                      sharpness 0x0098091b (int)    : min=0 max=255 step=1 default=128 value=128
         backlight_compensation 0x0098091c (int)    : min=0 max=1 step=1 default=0 value=0
                  exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=3 value=3
                1: Manual Mode
                3: Aperture Priority Mode
              exposure_absolute 0x009a0902 (int)    : min=3 max=2047 step=1 default=250 value=333 flags=inactive
         exposure_auto_priority 0x009a0903 (bool)   : default=0 value=0
                   pan_absolute 0x009a0908 (int)    : min=-36000 max=36000 step=3600 default=0 value=0
                  tilt_absolute 0x009a0909 (int)    : min=-36000 max=36000 step=3600 default=0 value=0
                 focus_absolute 0x009a090a (int)    : min=0 max=250 step=5 default=0 value=0
                     focus_auto 0x009a090c (bool)   : default=1 value=0
                  zoom_absolute 0x009a090d (int)    : min=100 max=500 step=1 default=100 value=100


  


  if i remove the 3rd line of my script the camera records the stream of video and sound to the file flawless. i tried diferent things for the 3rd line as -vcodec and something to do with pix-format flag to YUYV without success.
Is it possible to achieve this with just one ffmpeg process ?
Will the sound be made available to the loopback device also ?
How to transcode it to the proper pixel format used by loopback device ?

  


• ffserver : translate cropped video

  26 janvier 2021, par Michael O.

  I'm getting the h264 video from IP camera. I need to crop it and retranslate with ffserver. Here is the command ffmpeg to get a stream :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://admin:@192.168.88.10:554/channel=1&stream=0.sdp" -filter:v "crop=400:250:800:1045" -vcodec h264 tmp.mp4


  


  It works fine and I get the cropped video in the file tmp.mp4.

  


  Here are the ffserver settings :

  


  <feed>&#xA;File /tmp/feed1.ffm&#xA;FileMaxSize 200M&#xA;Launch ffmpeg -rtsp_transport tcp -i "rtsp://admin:@192.168.88.10:554/channel=1&amp;stream=0.sdp" -filter:v "crop=400:250:800:1045" -vcodec h264&#xA;</feed>&#xA;<stream>&#xA;Feed feed1.ffm&#xA;Format mjpeg&#xA;VideoBitRate 1000&#xA;VideoBufferSize 400&#xA;VideoFrameRate 17&#xA;VideoSize 400x250&#xA;VideoGopSize 10&#xA;NoAudio&#xA;Preroll 5&#xA;NoDefaults&#xA;</stream>&#xA;

  


  Trying to launch ffserver :

  


  $ ffserver -loglevel debug -d -f /etc/ffserver.conf
ffserver started on 2021-01-27 at 01:02:43
Report written to "ffserver-20210127-010243.log"
ffserver version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Wed Jan 27 01:02:43 2021 [NULL @ 0x55769974cbc0]Opening '/tmp/feed1.ffm' for reading
Wed Jan 27 01:02:43 2021 [file @ 0x557699755300]Setting default whitelist 'file,crypto'
Wed Jan 27 01:02:43 2021 [ffm @ 0x55769974cbc0]Format ffm probed with size=2048 and score=101
Wed Jan 27 01:02:43 2021 [NULL @ 0x557699757320]Setting entry with key 'b' to value '1000000'
Wed Jan 27 01:02:43 2021 [NULL @ 0x557699757320]Setting entry with key 'bufsize' to value '3276800'
Wed Jan 27 01:02:43 2021 [NULL @ 0x557699757320]Setting entry with key 'time_base' to value '1/17'
Wed Jan 27 01:02:43 2021 [NULL @ 0x557699757320]Setting entry with key 'video_size' to value '400x250'
Wed Jan 27 01:02:43 2021 [NULL @ 0x557699757320]Setting entry with key 'g' to value '10'
Wed Jan 27 01:02:43 2021 Codecs do not match for stream 0
Wed Jan 27 01:02:43 2021 [AVIOContext @ 0x55769974d7a0]Statistics: 4096 bytes read, 0 seeks
Wed Jan 27 01:02:43 2021 [file @ 0x5576997552e0]Setting default whitelist 'file,crypto'
Wed Jan 27 01:02:43 2021 [ffm @ 0x55769974cbc0]Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
Wed Jan 27 01:02:43 2021 writing recommended configuration: b=1000000,bufsize=3276800,time_base=1/17,video_size=400x250,g=10
Wed Jan 27 01:02:43 2021 [AVIOContext @ 0x557699757be0]Statistics: 0 seeks, 1 writeouts
Wed Jan 27 01:02:43 2021 FFserver started.
Wed Jan 27 01:02:43 2021 Launch command line: ./ffmpeg -rtsp_transport tcp -i rtsp://admin:@192.168.88.10:554/channel=1&stream=0.sdp -filter:v crop=400:250:800:1045 -vcodec h264 http://127.0.0.1:8090/feed1.ffm 
feed1.ffm: Pid 30808 exited with status 256 after 0 seconds


  


  There is the line :

  


  Codecs do not match for stream 0


  


  every time when I try to launch it. I tried various video formats : mpjpeg, avi, mpeg, flv, mp4, webm, and the result is the same. How can I successfully launch ffserver ?

  


• when i built ffmpeg to push raspberry pi 4 camera stream to my sever,I get Unknown input format : 'h264' ERROR

  26 janvier 2021, par IOKE Bai

  input :

  


  


  raspivid -o - -t 0 -vf -hf -fps 10 -b 500000 | ffmpeg -re -ar 44100
-ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp ://111.111.111.111/live/stream

  


  


  output :

  


  


  


  ffmpeg version N-100793-gc7016e35a6 Copyright (c) 2000-2021
the FFmpeg developers
built with gcc 8 (Raspbian 8.3.0-6+rpi1)
configuration : —extra-ldflags=-latomic —enable-gpl —enable-version3 —enable-nonfree
—enable-static —disable-shared —prefix=/usr/local —disable-opencl —disable-thumb —disable-pic —disable-stripping
—enable-small —enable-ffmpeg —enable-ffplay —enable-ffprobe —disable-doc —disable-htmlpages —disable-podpages —disable-txtpages —disable-manpages —disable-everything —enable-libx264 —enable-encoder=libx264 —enable-encoder=h264
—enable-decoder=h264 —enable-decoder=pcm_s16le —enable-encoder=aac —enable-decoder=aac —enable-encoder=ac3 —enable-decoder=ac3 —enable-encoder=rawvideo —enable-decoder=rawvideo —enable-encoder=mjpeg —enable-decoder=mjpeg —enable-demuxer=concat —enable-muxer=flv —enable-demuxer=flv —enable-demuxer=live_flv —enable-muxer=hls —enable-muxer=segment —enable-muxer=stream_segment —enable-muxer=mov —enable-demuxer=mov —enable-muxer=mp4 —enable-muxer=mpegts —enable-demuxer=mpegts —enable-demuxer=mpegvideo —enable-muxer=matroska —enable-demuxer=matroska —enable-muxer=wav —enable-demuxer=wav —enable-muxer='pcm*' —enable-demuxer='pcm*' —enable-muxer=rawvideo —enable-demuxer=rawvideo —enable-muxer=rtsp —enable-demuxer=rtsp —enable-muxer=rtsp —enable-demuxer=sdp —enable-muxer=fifo —enable-muxer=tee —enable-parser=h264 —enable-parser=aac —enable-protocol=file —enable-protocol=tcp —enable-protocol=rtmp —enable-protocol=cache —enable-protocol=pipe —enable-filter=aresample —enable-filter=allyuv —enable-filter=scale —enable-libfreetype —enable-indev=v4l2 —enable-indev=alsa —enable-omx —enable-omx-rpi —enable-encoder=h264_omx —enable-mmal —enable-hwaccel=h264_mmal —enable-decoder=h264_mmal
libavutil 56. 63.101 / 56. 63.101
libavcodec 58.118.100 / 58.118.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7. 97.100 / 7. 97.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, s16le, from '/dev/zero' :
Duration : N/A, bitrate : 1411 kb/s
Stream #0:0 : Audio : pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s

  


  


  


  ERROR

  


  


  Unknown input format : 'h264'