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  • Unknown V4L2 pixel format equivalent for yuva420p with ffmpeg and v4l2loopback

    7 février 2019, par Kim

    I am trying to use filter_complex from ffmpeg to stich several video input together into one output.

    I use v4l2loopback to create a virtual video device :

    sudo modprobe v4l2loopback video_nr=90

    In this example, i first try with only one camera :

    v4l2-ctl --device=/dev/video0 --info gives the following output :

    Driver Info (not using libv4l2):
    
        Driver name   : uvcvideo
    
        Card type     : HD USB Camera
    
        Bus info      : usb-0000:00:14.0-13.2
    
        Driver version: 4.10.17
    
        Capabilities  : 0x84200001
    
                Video Capture
    
                Streaming
    
                Extended Pix Format
    
                Device Capabilities
    
        Device Caps   : 0x04200001
    
                Video Capture
    
                Streaming
    
                Extended Pix Format
    
Priority: 2
    
Video input : 0 (Camera 1: ok)
    
Format Video Capture:
    
        Width/Height      : 640/480
    
        Pixel Format      : 'YUYV'
    
        Field             : None
    
        Bytes per Line    : 1280
    
        Size Image        : 614400
    
        Colorspace        : sRGB
    
        Transfer Function : Default
    
        YCbCr Encoding    : Default
    
        Quantization      : Default
    
        Flags             :
    
Crop Capability Video Capture:
    
        Bounds      : Left 0, Top 0, Width 640, Height 480
    
        Default     : Left 0, Top 0, Width 640, Height 480
    
        Pixel Aspect: 1/1
    
Selection: crop_default, Left 0, Top 0, Width 640, Height 480
    
Selection: crop_bounds, Left 0, Top 0, Width 640, Height 480
    
Streaming Parameters Video Capture:
    
        Capabilities     : timeperframe
    
        Frames per second: 30.000 (30/1)
    
        Read buffers     : 0
    
                     brightness (int)    : min=0 max=15 step=1 default=8 value=8
    
                       contrast (int)    : min=0 max=15 step=1 default=8 value=8
    
                     saturation (int)    : min=0 max=15 step=1 default=7 value=7
    
                            hue (int)    : min=-10 max=10 step=1 default=0value=0
    
 white_balance_temperature_auto (bool)   : default=1 value=1
    
                          gamma (int)    : min=1 max=10 step=1 default=7 value=7
    
                           gain (int)    : min=0 max=0 step=0 default=0 value=0
    
           power_line_frequency (menu)   : min=0 max=2 default=2 value=2
    
      white_balance_temperature (int)    : min=2800 max=6500 step=1 default=2800 value=2800 flags=inactive
    
                      sharpness (int)    : min=0 max=15 step=1 default=6 value=6
    
         backlight_compensation (int)    : min=0 max=1 step=1 default=0 value=0
    
                  exposure_auto (menu)   : min=0 max=3 default=3 value=3
    
              exposure_absolute (int)    : min=4 max=5000 step=1 default=625 value=625 flags=inactive
    
                 focus_absolute (int)    : min=0 max=21 step=1 default=16 value=16 flags=inactive
    
                     focus_auto (bool)   : default=1 value=1

    Then i use this command to ouput /dev/video0 to /dev/video90 on the left side with a specific resolution :

    ffmpeg -loglevel verbose -y \
    
  -f v4l2 -thread_queue_size 512 -i /dev/video0 \
    
  -filter_complex "nullsrc=size=960x240 [base]; \
    
          [0:v] format=pix_fmts=yuva420p, setpts=PTS-STARTPTS, scale=320x240 [left]; \
    
          [base][left] overlay=shortest=1" \
    
  -f v4l2 /dev/video90

    Which results in the following error :

    [v4l2 @ 0x55fa67d02f60] Unknown V4L2 pixel format equivalent for yuva420p
    
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
    
Error initializing output stream 0:0 --
    
Conversion failed!

    Full logs :

    ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
    
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
    
  configuration: --prefix=/usr --extra-version='1~16.04.york0' --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
    
  WARNING: library configuration mismatch
    
  avcodec     configuration: --prefix=/usr --extra-version='1~16.04.york0'--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 --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
    
  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
    
[video4linux2,v4l2 @ 0x55fa67cfca00] fd:5 capabilities:84200001
    
[video4linux2,v4l2 @ 0x55fa67cfca00] Querying the device for the current frame size
    
[video4linux2,v4l2 @ 0x55fa67cfca00] Setting frame size to 640x480
    
Input #0, video4linux2,v4l2, from '/dev/video0':
    
  Duration: N/A, start: 273229.829138, bitrate: 147456 kb/s
    
    Stream #0:0: Video: rawvideo, 1 reference frame (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
    
[Parsed_nullsrc_0 @ 0x55fa67d00680] size:960x240 rate:25/1 duration:-1.000000 sar:1/1
    
[Parsed_scale_3 @ 0x55fa67d02240] w:320 h:240 flags:'bilinear' interl:0
    
Stream mapping:
    
  Stream #0:0 (rawvideo) -> format
    
  overlay -> Stream #0:0 (rawvideo)
    
Press [q] to stop, [?] for help
    
[Parsed_nullsrc_0 @ 0x55fa67cfc760] size:960x240 rate:25/1 duration:-1.000000 sar:1/1
    
[Parsed_scale_3 @ 0x55fa67d055c0] w:320 h:240 flags:'bilinear' interl:0
    
[graph 0 input from stream 0:0 @ 0x55fa67d06a40] w:640 h:480 pixfmt:yuyv422 tb:1/1000000 fr:30/1 sar:0/1 sws_param:flags=2
    
[auto_scaler_0 @ 0x55fa67d05d80] w:iw h:ih flags:'bilinear' interl:0
    
[Parsed_format_1 @ 0x55fa67d04360] auto-inserting filter 'auto_scaler_0' between the filter 'graph 0 input from stream 0:0' and the filter 'Parsed_format_1'
    
[auto_scaler_0 @ 0x55fa67d05d80] w:640 h:480 fmt:yuyv422 sar:0/1 -> w:640 h:480 fmt:yuva420p sar:0/1 flags:0x2
    
[Parsed_format_1 @ 0x55fa67d04360] TB:0.000001 FRAME_RATE:30.000000 SAMPLE_RATE:nan
    
[Parsed_scale_3 @ 0x55fa67d055c0] w:640 h:480 fmt:yuva420p sar:0/1 -> w:320 h:240 fmt:yuva420p sar:0/1 flags:0x2
    
[Parsed_overlay_4 @ 0x55fa67d05e80] main w:960 h:240 fmt:yuva420p overlay w:320 h:240 fmt:yuva420p
    
[Parsed_overlay_4 @ 0x55fa67d05e80] [framesync @ 0x55fa67d05fa8] Selected 1/1000000 time base
    
[Parsed_overlay_4 @ 0x55fa67d05e80] [framesync @ 0x55fa67d05fa8] Sync level 2
    
[v4l2 @ 0x55fa67d02f60] Unknown V4L2 pixel format equivalent for yuva420p
    
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
    
Error initializing output stream 0:0 --
    
Conversion failed!

    What I tried and didn’t work :

    • use -f h264 for the output, which ends in a av_interleaved_write_frame(): Invalid argument error

  • FFMPEG send RTP audio at 8k bytes/sec [closed]

    10 mai, par Muzza

    I'm trying to use FFMPEG to mimick a device that transmits G711U audio over UDP/RTP at 8k bytes per second.
The device im mimicking sends rtp packets every 20ms with 160byte payload.

    


    I've had limited success using the following command

    


    ffmpeg -f dshow -i audio="Microphone (Realtek(R) Audio)" -ac 1 -ar 8000 -ab 8 -acodec pcm_mulaw -f rtp rtp://127.0.0.1:12345?pkt_size=160


    


    This sends G711U encoded audio, in 160byte chunks, but streams at 64kB/s, not the 8kB/s that my device is expected, so the device errors out ?

    


    Any idea's would be massively appreciated !

    


    Thank you

    


    Log from FFMPEG

    


    >ffmpeg -f dshow -i audio="Microphone (Realtek(R) Audio)" -ac 1 -ar 8000 -ab 8 -acodec pcm_mulaw -f rtp rtp://127.0.0.1:12345?pkt_size=160
ffmpeg version 2025-04-23-git-25b0a8e295-essentials_build-www.gyan.dev Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 14.2.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      60.  2.100 / 60.  2.100
  libavcodec     62.  0.101 / 62.  0.101
  libavformat    62.  0.100 / 62.  0.100
  libavdevice    62.  0.100 / 62.  0.100
  libavfilter    11.  0.100 / 11.  0.100
  libswscale      9.  0.100 /  9.  0.100
  libswresample   6.  0.100 /  6.  0.100
  libpostproc    59.  1.100 / 59.  1.100
[aist#0:0/pcm_s16le @ 00000198256b73c0] Guessed Channel Layout: stereo
Input #0, dshow, from 'audio=Microphone (Realtek(R) Audio)':
  Duration: N/A, start: 135470.702000, bitrate: 1411 kb/s
  Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s, Start-Time 135470.702s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_mulaw (native))
Press [q] to stop, [?] for help
[pcm_mulaw @ 00000198256cf240] Bitrate 8 is extremely low, maybe you mean 8k
Output #0, rtp, to 'rtp://127.0.0.1:12345?pkt_size=160':
  Metadata:
    encoder         : Lavf62.0.100
  Stream #0:0: Audio: pcm_mulaw, 8000 Hz, mono, s16 (8 bit), 64 kb/s
    Metadata:
      encoder         : Lavc62.0.101 pcm_mulaw
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 62.0.100
m=audio 12345 RTP/AVP 0
b=AS:64

[out#0/rtp @ 00000198256cdd00] video:0KiB audio:973KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 8.467470%
size=    1055KiB time=00:02:04.51 bitrate=  69.4kbits/s speed=   1x
Exiting normally, received signal 2.


    


    Wireshark :
Wireshark Log

    


    Shows packets being sent every 0.20ms

    


  • Could not find com.arthenica:ffmpeg-kit-full:6.0-2

    6 mai, par gabocalero

    I started receiving this message when I build my project

    


    > Could not find com.arthenica:ffmpeg-kit-full:6.0-2.
  Searched in the following locations:
    - https://dl.google.com/dl/android/maven2/com/arthenica/ffmpeg-kit-full/6.0-2/ffmpeg-kit-full-6.0-2.pom
    - https://repo.maven.apache.org/maven2/com/arthenica/ffmpeg-kit-full/6.0-2/ffmpeg-kit-full-6.0-2.pom
    - https://jcenter.bintray.com/com/arthenica/ffmpeg-kit-full/6.0-2/ffmpeg-kit-full-6.0-2.pom
    - https://jitpack.io/com/arthenica/ffmpeg-kit-full/6.0-2/ffmpeg-kit-full-6.0-2.pom
    - https://pkgs.dev.azure.com/MicrosoftDeviceSDK/DuoSDK-Public/_packaging/Duo-SDK-Feed/maven/v1/com/arthenica/ffmpeg-kit-full/6.0-2/ffmpeg-kit-full-6.0-2.pom
    - https://oss.sonatype.org/content/repositories/snapshots/com/arthenica/ffmpeg-kit-full/6.0-2/ffmpeg-kit-full-6.0-2.pom
  Required by:
      project :presentation > project :domain


    


    These are the project's repositories

    


    allprojects {     
   repositories {
      google()
      mavenCentral()
      jcenter()
      maven { url 'https://jitpack.io' }
      maven { url "https://oss.sonatype.org/content/repositories/snapshots" }     
   } 
}


    


    And this is the dependency I'm adding

    


        implementation(libs.arthenica.ffmpeg.full)


    


    This is my libs.version.toml

    


    ffmpeg = "6.0-2"
arthenica-ffmpeg-full = {  group = "com.arthenica", name = "ffmpeg-kit-full", version.ref = "ffmpeg" }


    


    AFAICS in the project's github page, it will not be maintained anymore
ffmpeg-kit is archived on April 21, 2025

    


    In the short term, do you know any other repository that still servers this dependency ?

    


    On the other hand, do you know any other project to replace Arthenica ffmpeg-kit-full dependency ?

    


    Thank you very much

    


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