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Sur d’autres sites (9499)

  • Why convert wav to mp3 get different length

    13 avril 2022, par sybil

    I use NAudio and NAudio.Lame to convert a wav file to mp3 file,code like that :

    


    using var reader = new WaveFileReader(file);
using var ms = new MemoryStream();
var writer = new LameMP3FileWriter(ms, reader.WaveFormat, 32);
reader.CopyTo(writer);
writer.Flush();
File.WriteAllBytes(file.Replace("wav", "mp3"), ms.ToArray());


    


    the wav file length is 1500ms,but the mp3 file length is 1557ms.

    


    And I do the same thing by using ffmpeg.exe,command like that :

    


    ffmpeg -i c:\2\xxx.wav c:\2\xxx.mp3


    


    the output info :

    


    ffmpeg version 5.0.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 11.2.0 (Rev7, 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-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-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --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      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from 'c:\2\xxx.wav':
  Duration: 00:00:01.50, bitrate: 768 kb/s
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, mono, s16, 768 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'c:\2\xxx.mp3':
  Metadata:
    TSSE            : Lavf59.16.100
  Stream #0:0: Audio: mp3, 48000 Hz, mono, s16p
    Metadata:
      encoder         : Lavc59.18.100 libmp3lame
size=      12kB time=00:00:01.51 bitrate=  66.2kbits/s speed= 137x
video:0kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.928711%


    


    And I get a mp3 file which length is 1536ms.
So,why the length changed ?
Thanks for reading.

    


  • OSError : [Errno 9] Bad file descriptor when downloading using pytube and playing with discord.py

    15 septembre 2022, par Trevor Mathisen

    When using pytube to download a YouTube video and discord.py to play it, I am getting a OSError : [Errno 9] Bad file descriptor error. I've had this working at one point and can't seem to figure out what I changed which broke it.

    


    Full traceback :

    


    2022-09-15 20:20:44 INFO       discord.voice_client The voice handshake is being terminated for Channel ID 902294184994693224 (Guild ID 902294184994693220)
2022-09-15T20:20:44.010142763Z 2022-09-15 20:20:44 INFO     discord.voice_client Disconnecting from voice normally, close code 1000.
2022-09-15T20:20:44.058592513Z 2022-09-15 20:20:44 ERROR    discord.player Exception in voice thread Thread-5
2022-09-15T20:20:44.058623864Z Traceback (most recent call last):
2022-09-15T20:20:44.058629130Z   File "/usr/local/lib/python3.10/dist-packages/discord/player.py", line 698, in run
2022-09-15T20:20:44.058632003Z     self._do_run()
2022-09-15T20:20:44.058634500Z   File "/usr/local/lib/python3.10/dist-packages/discord/player.py", line 691, in _do_run
2022-09-15T20:20:44.058637013Z     play_audio(data, encode=not self.source.is_opus())
2022-09-15T20:20:44.058639334Z   File "/usr/local/lib/python3.10/dist-packages/discord/voice_client.py", line 683, in send_audio_packet
2022-09-15T20:20:44.058648759Z     self.socket.sendto(packet, (self.endpoint_ip, self.voice_port))
2022-09-15T20:20:44.058653057Z OSError: [Errno 9] Bad file descriptor
2022-09-15T20:20:44.058673762Z 2022-09-15 20:20:44 INFO     discord.player ffmpeg process 12 has not terminated. Waiting to terminate...
2022-09-15T20:20:44.062083854Z 2022-09-15 20:20:44 INFO     discord.player ffmpeg process 12 should have terminated with a return code of -9.


    


    Dockerfile :

    


    ENV MEDIA_DIR='/media/'
RUN mkdir -p /media


    


    Download function (check_path returns True, showing the file is there) :

    


    def download_videos(stream, filename):
    print(f'downloading {filename}')
    filepath = stream.download(output_path=config_db.environ_path, filename=f'{filename}.mp4')
    print(f'completed download of {filepath}')
    check_path = Path(filepath)
    if check_path.is_file():
        print(check_path)
    return filepath


    


    Play function :

    


    async def play(voice_channel, message, control = None):
    vc = get_vc()
    if not vc:
        vc = await voice_channel.connect()
    next_yt = YouTube(next_song)
    next_file = sub(r'\W+', '', next_yt.title.replace(' ', '_').replace('__', '_')).lower()
    next_song_path = download_videos(next_yt.streams.filter(only_audio=True, file_extension='mp4')[0], next_file)

    await message.channel.send(f'Done getting ready, I\'ll be there in a moment.')

while next_song:
    while vc.is_playing():
        await asynciosleep(0.5)
        continue

    try:
        vc.play(FFmpegPCMAudio(next_song_path))
        print(f'Playing {next_song_path} with latency of {vc.average_latency}')
        vc.source = PCMVolumeTransformer(vc.source, volume=0.15)
    except Exception as e:
        print(e)
        await vc.disconnect()
        next_song = None
        return
    next_song = sounds_db.get_next_song()
    next_yt = YouTube(next_song) if next_song else None
    next_file = sub(r'\W+', '', next_yt.title.replace(' ', '_').replace('__', '_')).lower() if next_song else None
    next_song_path = download_videos(next_yt.streams.filter(only_audio=True, file_extension='mp4')[0], next_file) if next_song else None


    


    I've mounted the /media/ dir during docker -v and can see the file is getting downloaded and when I copy the file to my local machine I can play it in an audio player.

    


    The program can access the SQLite database right next to the files in question just fine.

    


    I've deployed the container locally and to two different VPS's with the same file structure with the same behavior. I'm ripping my hair out.

    


  • "wrong sample count" When reading MP4 files using OpenCV

    26 octobre 2022, par Object Unknown

    I want to marge some mp4 videos using OpenCV library, but when I try to read those videos using cv::VideoCapture, it outputs like that :

    


    [mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9AAE9D80] co located POCs unavailable
[h264 @ 000001EB9AAE7D80] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A128600] co located POCs unavailable
[h264 @ 000001EB9A129840] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB9AA28E40] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A169B00] co located POCs unavailable
[h264 @ 000001EB9A16B680] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB960CD680] co located POCs unavailable
[h264 @ 000001EB960CC8C0] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A81DDC0] co located POCs unavailable
[h264 @ 000001EB9A81B000] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB960CB200] co located POCs unavailable
[h264 @ 000001EB960CBFC0] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB99F206C0] co located POCs unavailable
[h264 @ 000001EB99F20B40] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A81D480] co located POCs unavailable
[h264 @ 000001EB9A81B000] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9AD02C00] co located POCs unavailable
[h264 @ 000001EB9AD02300] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9A81B480] co located POCs unavailable
[h264 @ 000001EB9A81B940] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[h264 @ 000001EB9AD02780] co located POCs unavailable
[h264 @ 000001EB9AD01E40] co located POCs unavailable
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001EB96084B80] wrong sample count


    


    and just exited with exit value 0. I want to know why it is reporting this and how to solve it please.

    


    Heres my demo code :

    


    #include <string>&#xA;#include <iostream>&#xA;#include <opencv2></opencv2>core/core.hpp>&#xA;#include <opencv2></opencv2>video/video.hpp>&#xA;#include <opencv2></opencv2>imgproc/imgproc.hpp>&#xA;#include <opencv2></opencv2>videoio/videoio.hpp>&#xA;#include <opencv2></opencv2>highgui/highgui.hpp>&#xA;&#xA;int main()&#xA;{&#xA;        cv::Mat frame;&#xA;        cv::VideoCapture vcap;&#xA;        for (int i = 1; i &lt;= 60; i&#x2B;&#x2B;)&#xA;        {&#xA;            if (!vcap.open("G:\\Users\\15819\\Desktop\\Demo\\demo (" &#x2B; std::to_string(i) &#x2B; ").mp4"))&#xA;            {&#xA;                std::cout &lt;&lt; "Failed to Open File: demo (" &lt;&lt; i &lt;&lt; ").mp4" &lt;&lt; std::endl;&#xA;                continue;&#xA;            }&#xA;            while (!vcap.read(frame))&#xA;                cv::imshow("video", frame);&#xA;        }&#xA;        return 0;&#xA;}&#xA;</iostream></string>

    &#xA;

    I installed the OpenCV and FFmpeg library using vcpkg, here's the library information (displayed by vcpkg list command) :

    &#xA;

    ffmpeg:x64-windows                                4.4.1#21            a library to decode, encode, transcode, mux, dem...&#xA;ffmpeg:x86-windows                                4.4.1#21            a library to decode, encode, transcode, mux, dem...&#xA;ffmpeg[avcodec]:x64-windows                                           Build the avcodec library&#xA;ffmpeg[avcodec]:x86-windows                                           Build the avcodec library&#xA;ffmpeg[avdevice]:x64-windows                                          Build the avdevice library&#xA;ffmpeg[avdevice]:x86-windows                                          Build the avdevice library&#xA;ffmpeg[avfilter]:x64-windows                                          Build the avfilter library&#xA;ffmpeg[avfilter]:x86-windows                                          Build the avfilter library&#xA;ffmpeg[avformat]:x64-windows                                          Build the avformat library&#xA;ffmpeg[avformat]:x86-windows                                          Build the avformat library&#xA;ffmpeg[openh264]:x64-windows                                          H.264 de/encoding via openh264&#xA;ffmpeg[openh264]:x86-windows                                          H.264 de/encoding via openh264&#xA;ffmpeg[swresample]:x64-windows                                        Build the swresample library&#xA;ffmpeg[swresample]:x86-windows                                        Build the swresample library&#xA;ffmpeg[swscale]:x64-windows                                           Build the swscale library&#xA;ffmpeg[swscale]:x86-windows                                           Build the swscale library&#xA;opencv4:x64-windows                               4.6.0#6             computer vision library&#xA;opencv4:x86-windows                               4.6.0#6             computer vision library&#xA;opencv4[default-features]:x64-windows                                 Platform-dependent default features&#xA;opencv4[default-features]:x86-windows                                 Platform-dependent default features&#xA;opencv4[dnn]:x64-windows                                              Enable dnn module&#xA;opencv4[dnn]:x86-windows                                              Enable dnn module&#xA;opencv4[ffmpeg]:x64-windows                                           ffmpeg support for opencv&#xA;opencv4[ffmpeg]:x86-windows                                           ffmpeg support for opencv&#xA;opencv4[jpeg]:x64-windows                                             JPEG support for opencv&#xA;opencv4[jpeg]:x86-windows                                             JPEG support for opencv&#xA;opencv4[png]:x64-windows                                              PNG support for opencv&#xA;opencv4[png]:x86-windows                                              PNG support for opencv&#xA;opencv4[qt]:x64-windows                                               Qt GUI support for opencv&#xA;opencv4[qt]:x86-windows                                               Qt GUI support for opencv&#xA;opencv4[quirc]:x64-windows                                            Enable QR code module&#xA;opencv4[quirc]:x86-windows                                            Enable QR code module&#xA;opencv4[tiff]:x64-windows                                             TIFF support for opencv&#xA;opencv4[tiff]:x86-windows                                             TIFF support for opencv&#xA;opencv4[webp]:x64-windows                                             WebP support for opencv&#xA;opencv4[webp]:x86-windows                                             WebP support for opencv&#xA;opencv:x64-windows                                4.6.0               Computer vision library&#xA;opencv:x86-windows                                4.6.0               Computer vision library&#xA;opencv[default-features]:x64-windows                                  Platform-dependent default features&#xA;opencv[default-features]:x86-windows                                  Platform-dependent default features&#xA;opencv[dnn]:x64-windows                                               Enable dnn module&#xA;opencv[dnn]:x86-windows                                               Enable dnn module&#xA;opencv[jpeg]:x64-windows                                              JPEG support for opencv&#xA;opencv[jpeg]:x86-windows                                              JPEG support for opencv&#xA;opencv[png]:x64-windows                                               PNG support for opencv&#xA;opencv[png]:x86-windows                                               PNG support for opencv&#xA;opencv[quirc]:x64-windows                                             Enable QR code module&#xA;opencv[quirc]:x86-windows                                             Enable QR code module&#xA;opencv[tiff]:x64-windows                                              TIFF support for opencv&#xA;opencv[tiff]:x86-windows                                              TIFF support for opencv&#xA;opencv[webp]:x64-windows                                              WebP support for opencv&#xA;opencv[webp]:x86-windows                                              WebP support for opencv&#xA;

    &#xA;

    Other Environments :

    &#xA;

    OS: Windows 11 x64 Professional Workstation&#xA;IDE: Visual Studio 2022&#xA;Project C&#x2B;&#x2B; Standard: C&#x2B;&#x2B;14&#xA;Project Platform: x64 Release&#xA;

    &#xA;

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