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• AVCodec h264_v4l2m2m hardware decoding unable to find device

  26 juillet 2023, par nathansizemore

  Using a custom compiled FFmpeg :

  


   $ ./ffmpeg -codecs | grep h264
ffmpeg version n6.0 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 7 (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04)
  configuration: --arch=aarch64 --enable-cross-compile --target-os=linux --cross-prefix=aarch64-linux-gnu- --prefix=/builds/dronesense/rust/ffmpeg-build/ffmpeg/out --pkgconfigdir= --pkg-config=pkg-config --extra-libs='-ldl -lpthread' --enable-libvpx --enable-libx264 --enable-libx265 --enable-decklink --enable-gpl --enable-nonfree --enable-shared --disable-static
  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
  libpostproc    57.  1.100 / 57.  1.100
 DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m ) (encoders: libx264 libx264rgb h264_v4l2m2m )


  


  /dev/video32 seems to have H.264 decoding support :

  


  $ v4l2-ctl --list-formats-out -d /dev/video32
ioctl: VIDIOC_ENUM_FMT
    Index       : 0
    Type        : Video Output Multiplanar
    Pixel Format: 'MPG2' (compressed)
    Name        : MPEG-2 ES

    Index       : 1
    Type        : Video Output Multiplanar
    Pixel Format: 'H264' (compressed)
    Name        : H.264

    Index       : 2
    Type        : Video Output Multiplanar
    Pixel Format: 'HEVC' (compressed)
    Name        : HEVC

    Index       : 3
    Type        : Video Output Multiplanar
    Pixel Format: 'VP80' (compressed)
    Name        : VP8

    Index       : 4
    Type        : Video Output Multiplanar
    Pixel Format: 'VP90' (compressed)
    Name        : VP9


  


  I've tried two approaches (Rust with bindgen) :

  


  Approach 1 :

  


  fn init_decoder() -> Arc<contextwrapper> {&#xA;    let name = CString::new("h264_v4l2m2m").unwrap();&#xA;    let codec = unsafe { ffmpeg::avcodec_find_decoder_by_name(name.as_ptr()) };&#xA;    if codec.is_null() {&#xA;        error!("finding codec");&#xA;        process::exit(1);&#xA;    }&#xA;&#xA;    let ctx = unsafe { ffmpeg::avcodec_alloc_context3(codec) };&#xA;    if ctx.is_null() {&#xA;        error!("creating context");&#xA;        process::exit(1);&#xA;    }&#xA;&#xA;    let r = unsafe { ffmpeg::avcodec_open2(ctx, codec, ptr::null_mut()) };&#xA;    if r &lt; 0 {&#xA;        error!("opening codec: {r}");&#xA;        process::exit(1);&#xA;    }&#xA;&#xA;    Arc::new(ContextWrapper(ctx))&#xA;}&#xA;</contextwrapper>

  


  Results in :

  


  [h264_v4l2m2m @ 0x7f1c001600] Could not find a valid device
[h264_v4l2m2m @ 0x7f1c001600] can't configure decoder
[ERROR] [decoder] [webrtc::codec] opening codec: -1


  


  Approach 2

  


  fn init_decoder() -> Arc<contextwrapper> {&#xA;    let name = CString::new("h264_v4l2m2m").unwrap();&#xA;    let codec = unsafe { ffmpeg::avcodec_find_decoder_by_name(name.as_ptr()) };&#xA;    if codec.is_null() {&#xA;        error!("finding codec");&#xA;        process::exit(1);&#xA;    }&#xA;&#xA;    let mut i = 0;&#xA;    let mut hw_pix_fmt: AVPixelFormat = unsafe { mem::zeroed() };&#xA;    loop {&#xA;        let config = unsafe { ffmpeg::avcodec_get_hw_config(codec, i) };&#xA;        if config.is_null() {&#xA;            error!("decoder not supported");&#xA;            process::exit(1);&#xA;        }&#xA;&#xA;        unsafe {&#xA;            info!("device type: {:?}", (*config).device_type);&#xA;            if ((*config).methods &amp; ffmpeg::AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX as i32) > 0 {&#xA;                hw_pix_fmt = (*config).pix_fmt;&#xA;                break;&#xA;            }&#xA;        }&#xA;    }&#xA;&#xA;    info!("pixel format: {:?}", hw_pix_fmt);&#xA;&#xA;    let ctx = unsafe { ffmpeg::avcodec_alloc_context3(codec) };&#xA;    if ctx.is_null() {&#xA;        error!("creating context");&#xA;        process::exit(1);&#xA;    }&#xA;&#xA;    let r = unsafe { ffmpeg::avcodec_open2(ctx, codec, ptr::null_mut()) };&#xA;    if r &lt; 0 {&#xA;        error!("opening codec: {r}");&#xA;        process::exit(1);&#xA;    }&#xA;&#xA;    Arc::new(ContextWrapper(ctx))&#xA;}&#xA;&#xA;</contextwrapper>

  


  Results in :
error!("decoder not supported");

  


  I feel like there is a major step missing because looking at FFmpeg's Hardware Decode Example there are looking for a device type, to which v4l2 is not a part of the enum, so I do not what functions to call to get it setup.

  


  What is the proper way to setup an AVCodec decoder with H.264 hardware acceleration for v4l2m2m ?

  


• Everytime I run my code ffmpeg responds with this instead of doing its function. How do I fix ?

  25 juillet 2023, par Oreo F

  Output from ffmpeg/avlib:

ffmpeg version 2023-07-19-git-efa6cec759-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, 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-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      58. 14.100 / 58. 14.100
  libavcodec     60. 22.100 / 60. 22.100
  libavformat    60. 10.100 / 60. 10.100
  libavdevice    60.  2.101 / 60.  2.101
  libavfilter     9.  8.102 /  9.  8.102
  libswscale      7.  3.100 /  7.  3.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100


  


  Everytime I run the code it does this.

  


  code :

  


  import praw
import requests
import cv2
import os
from pydub import AudioSegment

def download_video(url, filename):
    response = requests.get(url)
    with open(filename, 'wb') as f:
        f.write(response.content)

def combine_videos(video_urls, output_filename):
    video_clips = []
    audio_clips = []
    for i, url in enumerate(video_urls):
        temp_filename = f'temp_video_{i}.mp4'
        download_video(url, temp_filename)
        video_clip = cv2.VideoCapture(temp_filename)
        audio_clip = AudioSegment.from_file(temp_filename, format="mp4")
        video_clips.append(video_clip)
        audio_clips.append(audio_clip)
    
    if not video_clips:
        print("No video clips to combine.")
        return

    frame_width = int(video_clips[0].get(cv2.CAP_PROP_FRAME_WIDTH))
    frame_height = int(video_clips[0].get(cv2.CAP_PROP_FRAME_HEIGHT))
    fps = int(video_clips[0].get(cv2.CAP_PROP_FPS))

    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
    output_clip = cv2.VideoWriter(output_filename, fourcc, fps, (frame_width, frame_height))

    for i, video_clip in enumerate(video_clips):
        while True:
            ret, frame = video_clip.read()
            if not ret:
                break
            output_clip.write(frame)
    
    for video_clip in video_clips:
        video_clip.release()
    
    output_clip.release()

    # Combining audio using pydub
    combined_audio = sum(audio_clips)
    combined_audio.export("combined_audio.mp3", format="mp3")

    # Merging audio with video using ffmpeg
    os.system(f'ffmpeg -i {output_filename} -i combined_audio.mp3 -c:v copy -c:a aac -strict experimental -map 0:v:0 -map 1:a:0 final_output.mp4')

    # Cleaning up temporary files
    os.remove("combined_audio.mp3")

def main():
    reddit = praw.Reddit(
       client_id='XXX',
        client_secret='XXX',
        user_agent='Reddit Video Downloader'
    )
    
    subreddit_name = input("Enter the name of the subreddit: ")
    limit = int(input("Enter the number of videos to download: "))
    
    subreddit = reddit.subreddit(subreddit_name)
    submissions = subreddit.hot(limit=limit)
    
    video_urls = [submission.url for submission in submissions if submission.media and 'reddit_video' in submission.media]
    
    if video_urls:
        output_filename = input("Enter the output filename (e.g., output.mp4): ")
        combine_videos(video_urls, output_filename)
        print("Videos combined successfully!")
    else:
        print("No Reddit videos found in the subreddit.")

if __name__ == "__main__":
    main()


  


  Anyone got any idea why this happens ?

  


  I'm making a script that scrapes videos from a specific subreddit.

  


  Also if it helps the temp video file is corrupted when it gets made.

  


  I've put this into chatGPT as well and brought an expert friend and he hasn't been able to help me.

  


• FFMPEG Fontconfig error : Cannot load default config file : No such file : (null) Abort trap

  28 juillet 2023, par FastNumbers

  /usr/local/bin/ffmpeg -loop 1 -t 11.14 -i 3339861349.jpg -filter_complex "drawtext=text=aaaaa" -r 25 -vcodec libx264 -preset veryfast -threads 8 -x264opts no-scenecut -b 850k -bt 850k -ac 2 -ab 32k -async 1 -y -f mp4 test.mp4
Give me result
Fontconfig error : Cannot load default config file : No such file : (null)
Abort trap

  


  With path to font file :
/usr/local/bin/ffmpeg -loop 1 -t 11.14 -i 3339861349.jpg -filter_complex "drawtext=text=aaaaa:fontfile=/usr/local/share/fonts/Roboto-Regular.ttf" -r 25 -vcodec libx264 -preset veryfast -threads 8 -x264opts no-scenecut -b 850k -bt 850k -ac 2 -ab 32k -async 1 -y -f mp4 test.mp4
Give me result
Abort trap

  


  Rebild ffmpeg with —enable-libfontconfig

  


  ffmpeg version 6.0-6.0 Copyright (c) 2000-2023 the FFmpeg developers
built with FreeBSD clang version 13.0.0 (git@github.com:llvm/llvm-project.git llvmorg-13.0.0-0-gd7b669b3a303)
configuration : —enable-gpl —enable-gmp —enable-gnutls —enable-libdav1d —enable-libsvtav1 —enable-librav1e —enable-libvmaf —enable-libx264 —enable-chromaprint —enable-libx265 —enable-libvpx —enable-libxvid —enable-libvidstab —enable-libaom —enable-libzimg —enable-libmodplug —enable-libsoxr —enable-libmysofa —enable-lv2 —enable-libopencore_amrnb —enable-libopencore_amrwb —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libtwolame —enable-libspeex —enable-lv2 —enable-libtheora —enable-librubberband —enable-libgme —enable-libwebp —enable-libzmq —enable-libfribidi —enable-libfontconfig —enable-libfreetype —enable-libass —enable-runtime-cpudetect —cc=cc —cxx=cpp —disable-ffplay —disable-debug —disable-doc —disable-shared —enable-pthreads —enable-static —enable-small —enable-version3 —extra-cflags='-static -I/usr/home/azureagent/vsts/_work/1/s/FFmpeg/workspace/include -I/usr/home/azureagent/vsts/_work/1/s/FFmpeg/workspace/include/lilv-0 -I/usr/home/azureagent/vsts/_work/1/s/FFmpeg/workspace/include/lilv-0' —extra-cxxflags='-static -static-libstdc++' —extra-ldexeflags= —extra-ldflags=-L/usr/home/azureagent/vsts/_work/1/s/FFmpeg/workspace/lib —extra-libs='-static -lc++ -ldl -lpthread -lm -lmd -lz -lfftw3' —pkgconfigdir=/usr/home/azureagent/vsts/_work/1/s/FFmpeg/workspace/lib/pkgconfig —pkg-config-flags=—static —prefix=/usr/home/azureagent/vsts/_work/1/s/FFmpeg/workspace/done/ —extra-version=6.0