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• configure : don't disable '-ftree-vectorize' on GCC >= 13 on major architectures

  14 juillet, par Jiawei

  configure : don't disable '-ftree-vectorize' on GCC >= 13 on major architectures
  This changes configure to stop disabling -ftree-vectorize on
  
  GCC versions 13 and newer, on major architectures.
  Background :
  
   Original `-fno-tree-vectorize` was added in 2009 in commit
  
    973859f5230e to avoid compiler errors.
  
   Re-enabled in 2016 in commit cb8646af24bd but caused failures due
  
    to inline CABAC assembly issues and was disabled again in
  
    fd6dbc53855fb.
  
   Commit 182663a58a7a in 2023 fixed the inline CABAC assembly issues.
  
   Recent versions of GCC, in particular 13 and newer, seem to
  
    generally work reliably with respect to vectorization, although bugs
  
    have been observed on Loongarch.
  Cautiously allow the GCC default of having vectorization enabled,
  
  on major architectures where we expect to see enough testing. If
  
  further issues are observed, they should be reported and noted here in
  
  configure, so the workarounds can be scoped and version limited.
  

  • [DH] Changelog
  • [DH] configure

• How to use ffmpeg on a stream input to extract frames

  21 juillet 2023, par Deepak Sharma

  I have tried piping the stream to a ffmpeg process for extracting the frames. It does process the small files and able to extract the frames successfully but for most of the files it throws error. The reference of the code I have used from this link- https://mathewsachin.github.io/blog/2017/07/28/ffmpeg-pipe-csharp.html
When I am running the below code

  


  `

  


      public static void RunFfmpeg()
    {
        
        //-framerate 20 -f rawvideo -pix_fmt rgb32 -video_size 1920x1080
        var inputArgs = "-i -";
        var outputArgs = "-ss 00:00 -t 20 -vf fps=5  $filename%03d.bmp";

        var process = new Process
        {
            StartInfo =
            {
                FileName = "ffmpeg",
                Arguments = $"{inputArgs} {outputArgs}",
                UseShellExecute = false,
                //CreateNoWindow = true,
                RedirectStandardInput = true,
                RedirectStandardOutput = true,
                WorkingDirectory = @"d:\ffmpegout"
            }
        };

        process.Start();

        var ffmpegIn = process.StandardInput.BaseStream;

        using (Stream contents = File.OpenRead("C:\\Desktop\\Videos\\B.mp4"))
        {
            contents.CopyTo(ffmpegIn);
        }

        // After you are done
        ffmpegIn.Flush();
        ffmpegIn.Close();

        // Make sure ffmpeg has finished the work
        process.WaitForExit();
    }`


  


  I am getting the below error

  


  ffmpeg version 2023-07-16-git-c541ecf0dc-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
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000266a80179c0] Could not find codec parameters for stream 0 (Video : h264 (avc1 / 0x31637661), none(tv, bt709), 1280x720, 4023 kb/s) : unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fd :' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf58.76.100
Duration : 00:00:21.22, start : 0.000000, bitrate : N/A
Stream #0:00x1 : Video : h264 (avc1 / 0x31637661), none(tv, bt709), 1280x720, 4023 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn (default)
Metadata :
handler_name : VideoHandler
vendor_id : [0][0][0][0]
Stream mapping :
Stream #0:0 -> #0:0 (h264 (native) -> bmp (native))
[mov,mp4,m4a,3gp,3g2,mj2 @ 00000266a80179c0] stream 0, offset 0xbb3a : partial file
Cannot determine format of input stream 0:0 after EOF
Error marking filters as finished
Conversion failed !

  


  I did check the metadata of the video is present in the start of the file before the mdat box.

  


  Looking to get some help to resolve this issue.

  


• 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.