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• Arguments set but not used in GPAC

  30 avril 2022, par M faiz zeeshann

  I am trying to do the tiling of a 360-degree video with the following command.

  


  MP4Box -dash 1000 test.mp4 :"desc_as="

  


  it creates an MPD file but without tiles and gives the following errors.

  


  Arg segdur set but not used,
Arg mpeg set but not used,
Arg dash set but not used,
Arg srd set but not used,
Arg 2014 set but not used,

  


• ffmpeg use gpu to encode mpeg4 to ts/m3u8 [closed]

  14 novembre 2024, par danielRICADO

  using ffmpeg I want to trim and transcode a mpeg4 from ts / m3u8

  


  std::string ffmpeg_command = "ffmpeg -hwaccel drm -i " + output_dir + input_file +
                         " -ss 00:00:00.00 -t 31 -c:v " + codec + " -b:v " + std::to_string(bitrate) +
                         " -vf scale=" + std::to_string(width) + "x" + std::to_string(height) +
                         " -hls_time " + std::to_string(30) + " -hls_list_size 0 -hls_segment_filename " +
                         ts_file_pattern + " -f hls " + m3u8_file;


  


  I wanted to choose between codecs based on the system, if gpu is avaiable I'd like to opt to use it, right now I just check if the codec is available

  


  bool is_h264_v4l2m2m_available() {
    std::string result = exec_command("ffmpeg -encoders 2>&1");
    return result.find("h264_v4l2m2m") != std::string::npos;
}


  


  if it is a I wanted to move that process over to the gpu, not just use libx264. Here is the error log. Studying hard on the solution but wold super apperciate any expert advice.

  


  other considerations are - runs in a docker container on a pi5, pibian on the host apline on in the container, container runs in privledged mode

  


  2024-11-14 15:18:41 [INFO]: assigned codec: h264_v4l2m2m
2024-11-14 15:18:41 ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
2024-11-14 15:18:41   built with gcc 13.2.1 (Alpine 13.2.1_git20240309) 20240309
2024-11-14 15:18:41   configuration: --prefix=/usr --disable-librtmp --disable-lzma --disable-static --disable-stripping --enable-avfilter --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libmp3lame --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librist --enable-libsoxr --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-lto=auto --enable-lv2 --enable-openssl --enable-pic --enable-postproc --enable-pthreads --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-vulkan --optflags=-O3 --enable-libjxl --enable-libsvtav1 --enable-libvpl
2024-11-14 15:18:41   libavutil      58. 29.100 / 58. 29.100
2024-11-14 15:18:41   libavcodec     60. 31.102 / 60. 31.102
2024-11-14 15:18:41   libavformat    60. 16.100 / 60. 16.100
2024-11-14 15:18:41   libavdevice    60.  3.100 / 60.  3.100
2024-11-14 15:18:41   libavfilter     9. 12.100 /  9. 12.100
2024-11-14 15:18:41   libswscale      7.  5.100 /  7.  5.100
2024-11-14 15:18:41   libswresample   4. 12.100 /  4. 12.100
2024-11-14 15:18:41   libpostproc    57.  3.100 / 57.  3.100
2024-11-14 15:18:42 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/app/client-data/camera-output/7ea3cbef-4da0-11ed-bdcc-baf70a43c072/1731550687270.mp4':
2024-11-14 15:18:42   Metadata:
2024-11-14 15:18:42     major_brand     : isom
2024-11-14 15:18:42     minor_version   : 512
2024-11-14 15:18:42     compatible_brands: isomiso2avc1mp41
2024-11-14 15:18:42     encoder         : Lavf60.16.100
2024-11-14 15:18:42   Duration: 00:00:31.33, start: 0.000000, bitrate: 678 kb/s
2024-11-14 15:18:42   Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1024x1024, 677 kb/s, 15 fps, 15 tbr, 15360 tbn (default)
2024-11-14 15:18:42     Metadata:
2024-11-14 15:18:42       handler_name    : VideoHandler
2024-11-14 15:18:42       vendor_id       : [0][0][0][0]
2024-11-14 15:18:42 [AVFormatContext @ 0x7f9254dcb4c0] Unable to choose an output format for '678000'; use a standard extension for the filename or specify the format manually.
2024-11-14 15:18:42 [out#0 @ 0x7f9254d70700] Error initializing the muxer for 678000: Invalid argument
2024-11-14 15:18:42 Error opening output file 678000.
2024-11-14 15:18:42 Error opening output files: Invalid argument
2024-11-14 15:18:42 [ERROR]: Failed to generate .ts file for: 1731550687270.mp4


  


• Find video resolution and video duration of remote mediafile

  22 février 2012, par osgx

  I want to write an program which can find some metainformation of mediafile. I'm interested in popular video formats, such as avi, mkv, mp4, mov (may be other popular too). I want basically to get :

  • Video size (720, 1080, 360 etc)
  • Total runtime of video (may be not very exact)
  • Number of audio streams
  • Name of video codec
  • Name of audio codec

  There is already the mediainfo, but in my program I want to get information about remote file, which may be accessed via ftp, http, samba ; or even torrent (there are some torrent solutions, which allows to read not-yet downloaded file).

  MediaInfo library have no support of samba (smb ://) and mkv format (for runtime).

  Also, I want to know, how much data should be downloaded to get this information. I want not to download full videofile because I have no enough disk space.

  Is this information in the first 1 or 10 or 100 KiloBytes of the file ? Is it at predictable offset if I know the container name and total file size ?

  PS : Platform is Linux, Language is C/C++