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• Does there exist fonts that supprot all languages in the FFmpeg ?

  20 novembre 2024, par phil lx

  I encountered an issue while using FFmpeg to composite a video. After analyzing the user's request, I discovered that the subtitles included Korean text, which caused the process to hang. To address this, I downloaded a Korean font and placed it in the server's fonts directory. This resolved the problem temporarily.

  


  However, this solution is not comprehensive. Another user later requested a video that included traditional Chinese characters, which caused the process to hang again.

  


  成吉思汗，传统蒙古文写作ᠴᠢᠩᠭᠢᠰ ᠬᠠᠭᠠᠨ，拉丁蒙古文写作Činggis Qaγan，西里尔蒙古文写作Чингис Хаан，他是蒙古族乞颜部人

  


  I would like to know if there is a universal font style that supports all languages to prevent such issues in the future.

  


  For reference, I currently use the Alibaba PuHuiTi font, which I downloaded from this link : https://www.zitijia.com/downloadpage?itemid=250417369808129081.

  


  Here is the relevant portion of my code :

  


  filters1 = []
    filters1.append(f"[0:v]crop={int(0.8*width)}:{int(0.8*height)}:{int(0.1*width)}:0,scale={width}:{height}[vout]")
    if add_sub == 1:
        filters1.append(f"[vout]subtitles={srt_path}:force_style='Fontname=Alibaba PuHuiTi,Fontsize={font_size},PrimaryColour={font_color},OutlineColour={font_border_color},MarginV={font_position*(288-font_size)}'[vout]")

    filter_complex1 = ';'.join(filters1)

    command = [
        'ffmpeg',
        '-y',  # 覆盖输出文件
        '-threads', '12',
        # '-loglevel', 'error',
        
        # 第一个输入
        '-f', 'rawvideo',  # 输入为原始视频数据
        '-vcodec', 'rawvideo',
        '-s', f'{width}x{height}',  # 图像尺寸
        '-pix_fmt', 'rgb24',  # 输入像素格式
        '-r', '30',  # 帧率
        '-i', '-',  # 输入从stdin

        # 复杂过滤器
        '-filter_complex', filter_complex1,

        # 映射输出流
        '-map', '[vout]',  # 使用裁剪后的视频
        # '-map', '[audio_out]',  # 使用混合后的音频

        # 输出选项
        '-vcodec', 'h264_nvenc',  # 输出视频编码
        '-pix_fmt', 'yuv420p',  # 输出像素格式
        # '-acodec', 'aac',  # 输出音频编码
        '-strict', 'experimental',  # 兼容性模式

        # 输出文件
        video_withoutspeed_path
    ]


  


  As shown above. hey-hey-hey

  


• How do I configure codec parameters for a RTSP stream ?

  16 mai 2024, par Kermit

  I am trying to stream a network camera source into /dev/video0. However, all attempts keep telling me I have set incorrect codec parameters. Any suggestions ?

  


  # works
ffplay rtsp://admin:password@172.16.0.184:554/live


  


  Then trying any of these to feed into /dev/video0 (valid from list of ls /dev/video*) :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://admin:password@172.16.0.184:554/live" -c:v rawvideo -pix_fmt yuv420p -f v4l2 /dev/video0


  


  Results in

  


  ffmpeg version 5.1.4-0+rpt3+deb12u1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12 (Debian 12.2.0-14)
  configuration: --prefix=/usr --extra-version=0+rpt3+deb12u1 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --disable-mmal --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --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-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librist --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sand --enable-sdl2 --disable-sndio --enable-libjxl --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-libplacebo --enable-librav1e --enable-shared
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, rtsp, from 'rtsp://admin:password@172.16.0.184:554/live':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: hevc (Main), yuv420p(tv), 3840x2160, 30 fps, 100 tbr, 90k tbn
  Stream #0:1: Audio: aac (LC), 32000 Hz, mono, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
[video4linux2,v4l2 @ 0x55562d9faa70] ioctl(VIDIOC_G_FMT): Invalid argument
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:0 -- 
Conversion failed!


  


• where to save mpd file in raspberry pi so dash.js can access it remotely ?

  11 mai 2016, par Djm

  This is very high level question. I want to stream a live video from raspberry pi. I want to be able to watch live video in the browser remotely being streamed by the Raspberry pi.I want to use DASH stream protocol, and Dash.js as client to HTML5. I have looked through different tutorials but i am still puzzled about how this works.I understand that (assuming you have already prepared your videos with FFMPEG tool) from the client Dash.js
  you have to make a call/request and pass a url to your mpd file. My question is where would you save the file in raspberry pi especially if the Dash client is in a different web app(i want to make the call remotely) ?