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• Inappropriate ioctl for device in zoneminder - zmc_dvideo0

  9 juin 2024, par Adam

  I recently needed to rebuild my zoneminder local camera system, running on an RPi. I switched OS from Debian to Ubuntu and now I'm struggling to get video4linux to decode the video input. The result is either a black or green screen depending on the compression palette I select.

  


  I'm using /dev/video0 as my input.

  


  v4l2-ctl --list-devices

unicam (platform:fe801000.csi):
        /dev/video0
        /dev/media3


  


  In the logs I'm getting :

  


  zmc_dvideo0 10907   ERR Unable to query control: Inappropriate ioctl for device 


  


  I don't understand the function of the /dev/media3 device, presumably created by the bcm2835-v4l2 module. This site suggests that /dev/video0 needs to extract the ioctl from or link in some way to /dev/media3. Perhaps a red herring.

  


  If I select /dev/media3 as the source, I get :

  


  : FAT [zmc_dmedia3] [Failed to query video device: Inappropriate ioctl for device]
: ERR ['zmc -d /dev/media3' exited abnormally, exit status 255]


  


  I'm using

  


  

  • PAL60 encoding

  


  • YUV422p compression

  


  • 1280 x 720 Capture Resolution

  


  


  # lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 24.04 LTS
Release:        24.04
Codename:       noble

# uname -a
Linux ubuntu 6.8.0-1005-raspi #5-Ubuntu SMP PREEMPT_DYNAMIC Wed May 22 15:01:35 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux


  


  Using ffmpeg from the cli, I get a similar output, resulting in a green display. This happens both with and without the hardware acceleration flag.

  


  sudo -u www-data ffmpeg -f v4l2 -pix_fmt yuyv422 -framerate 30 -video_size 1280x720 -i /dev/video0 -codec:v h264_v4l2m2m video0_out.mp4


  


  I've set debug to 6 in the ZM options - Any clues on troublshooting steps I can take to further understand why the camera stream is not being shown and how to fix it ?

  


• Amplification of recorded audio in flutter app using FFMPEG not working correctly

  20 mai 2024, par Noman khanbhai

  In my app I need to record audio and send it to server, server then sends the file to a hardware using mqtt and then file gets played on the hardware. I am using flutter to build app and using record 5.0.5 package for audio recording and for amplification ffmpeg_kit_flutter 6.0.3 package to do the amplification.

  


  The issue is it doesnt seems like there is much change in amplitude, I used different values for amplification factor but audio remains same.

  


  Here is the code for amplification

  


  Future<string>? amplifyAudio(&#xA;      String inputPath, String outputPath) async {&#xA;&#xA;    // Build FFmpeg command to amplify audio&#xA;    outputPath = await modifyOutputPath(inputPath)!;&#xA;    String audioFilter = &#x27;volume=${amplificationFactor}dB&#x27;; &#xA;    //-c:a aac&#xA;    String command = &#x27;-i $inputPath -af $audioFilter $outputPath&#x27;;&#xA;&#xA;    // Execute FFmpeg command&#xA;    await FFmpegKit.executeAsync(command).then((session) async {&#xA;      debugPrint("After executeAsync session ${session.toString()}");&#xA;      debugPrint(&#xA;          "After executeAsync returncode ${await session.getReturnCode()}");&#xA;      debugPrint("After executeAsync command ${session.getCommand()}");&#xA;      log("After executeAsync alllogs ${await session.getAllLogs()}");&#xA;      log("After executeAsync alllogstring ${await session.getAllLogsAsString()}");&#xA;      log("After executeAsync failStackTrace ${await session.getFailStackTrace()}");&#xA;    }).onError((error, stackTrace) {&#xA;      debugPrint("After executeAsync error ${error.toString()}");&#xA;    });&#xA;&#xA;    return outputPath;&#xA;  }&#xA;&#xA;</string>

  


  This are the logs when above method gets executed.

  


  FFMpeg command -> `-i /data/user/0/com.orgname.flutter.appname/app_flutter/1716209206469.aac -af volume=10.0dB /storage/emulated/0/Download/1716209213238_amplified.aac`

> Logs
> After executeAsync alllogstring ffmpeg version n6.0 Copyright (c) 2000-2023 the FFmpeg developers
> built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
> configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-iconv --disable-sdl2 --disable-openssl --enable-zlib --enable-mediacodec
> libavutil      58.  2.100 / 58.  2.100
> libavcodec     60.  3.100 / 60.  3.100
> libavformat    60.  3.100 / 60.  3.100
> libavdevice    60.  1.100 / 60.  1.100
> libavfilter     9.  3.100 /  9.  3.100
> libswscale      7.  1.100 /  7.  1.100
> libswresample   4. 10.100 /  4. 10.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.orgname.flutter.appname/app_flutter/1716209206469.aac':
> Metadata:
> major_brand     : mp42
> minor_version   : 0
> compatible_brands: isommp42
> creation_time   : 2024-05-20T12:46:52.000000Z
> com.android.version: 12
> Duration: 00:00:04.76, start: 0.000000, bitrate: 131 kb/s
> Stream #0:0[0x1](eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
> Metadata:
> creation_time   : 2024-05-20T12:46:52.000000Z
> handler_name    : SoundHandle
> vendor_id       : [0][0][0][0]
> Stream mapping:
> Stream #0:0 -> #0:0 (aac (native) -> aac (native))
> Press [q] to stop, [?] for help


  


  Note - I am also playing the audio after recording and before amplification in app, and also saving in download. to make sure audio file is correct.

  


  Amplified file also gets saved but there is almost no difference.

  


  I have also searched/googled/ and also done chatgpt to resolve issue. but nothing worked.

  


• ffprobe newer version detect audio codec incorrectly

  16 janvier, par alancc

  I find a strange problem.

  


  I have a test video with h264 video codec and aac audio codec. It is at https://drive.google.com/file/d/1YAyz5cO0kb9r0MgahCpISR4bZ_1_n8PL/view?usp=sharing

  


  I build a ffmpeg version by myself, its version is :

  


  ffprobe version 7.0.2 Copyright (c) 2007-2024 the FFmpeg developers
  built with gcc 14.1.0 (Rev3, Built by MSYS2 project)
  configuration: --enable-shared
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100


  


  I then use ffprobe to get its info :

  


  ffprobe -v quiet -print_format ini -show_streams -show_packets test_h264.mp4 > test_h264.ini


  


  Then I get an ini file which shows the audio codec as MP2 :

  


  [streams.stream.0]
index=0
codec_name=mp2
codec_long_name=MP2 (MPEG audio layer 2)
profile=unknown
codec_type=audio
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
initial_padding=0
id=0x1
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=2788
start_time=0.063220
duration_ts=435455
duration=9.874263
bit_rate=127706
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=378
nb_read_frames=N/A
nb_read_packets=378


  


  Another developer he uses his version of ffprobe :

  


  ffprobe version 2023-02-22-git-d5cc7acff1-full_build-www.gyan.dev Copyright (c) 2007-2023 the FFmpeg developers  


  


  Based on the year, my version(2024) should be newer than his(2023), but his version of ffprobe can get the audio codec properly :

  


  [streams.stream.1]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
initial_padding=0
id=0x2
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=1764
start_time=0.040000
duration_ts=436480
duration=9.897506
bit_rate=111733
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=427
nb_read_frames=N/A
nb_read_packets=427
extradata_size=5


  


  Why ?

  


  I also tried a ffprobe version on ubuntu with the following version :

  


  ffprobe version 6.1.1-3ubuntu5 Copyright (c) 2007-2023 the FFmpeg developers
  built with gcc 13 (Ubuntu 13.2.0-23ubuntu3)
  configuration: --prefix=/usr --extra-version=3ubuntu5 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcaca --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 --enable-libvpl --disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      58. 29.100 / 58. 29.100
  libavcodec     60. 31.102 / 60. 31.102
  libavformat    60. 16.100 / 60. 16.100
  libavdevice    60.  3.100 / 60.  3.100
  libavfilter     9. 12.100 /  9. 12.100
  libswscale      7.  5.100 /  7.  5.100
  libswresample   4. 12.100 /  4. 12.100
  libpostproc    57.  3.100 / 57.  3.100


  


  It will detect the audio as aac properly, but with different parameters, for example, bit_rate is 111733(developer) but 110399(ubuntu). But this parameter comes from the same file so should be the same.

  


  [streams.stream.1]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=44100
channels=2
channel_layout=stereo
bits_per_sample=0
initial_padding=0
id=0x2
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/44100
start_pts=0
start_time=0.000000
duration_ts=441353
duration=10.008005
bit_rate=110399
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=432
nb_read_frames=N/A
nb_read_packets=432
extradata_size=5