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• How to change metadata company_name using ffmpeg

  16 juillet 2020, par Pushp Vashisht

  According to the documentation, to change the metadata,we have to use -metadata option and provide key/value pair of the metadata that we want to add/change :

  


  ffmpeg -i in.avi -metadata title="my title" out.flv


  


  So, I tried doing :

  


  ffmpeg -i in.avi -metadata company_name="My Company" out.flv


  


  Now, when I print out the metadata using ffprobe :

  


  Metadata:
    uid             : adab4424-2f25-4dc7-92ff-29bd000c0000
    generation_uid  : adab4424-2f25-4dc7-92ff-29bd000c0001
    company_name    : FFmpeg


  


  How do I change the metadata company_name ?

  


  EDIT :

  


  log after running the ffmpeg command

  


  ffmpeg -i in.avi -metadata company_name="My Company" out.flv
ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mxf, from 'rep12.mxf':
  Metadata:
    uid             : adab4424-2f25-4dc7-92ff-29bd000c0000
    generation_uid  : adab4424-2f25-4dc7-92ff-29bd000c0001
    company_name    : FFmpeg
    product_name    : OP1a Muxer
    product_version : 57.83.100
    product_uid     : adab4424-2f25-4dc7-92ff-29bd000c0002
    modification_date: 0-01-02T00:00:00.000000Z
    material_package_umid: 0x060A2B340101010501010D001343BF7652947134C343BF760052947134C34300
    timecode        : 00:00:00:00
  Duration: 00:00:30.03, start: 0.000000, bitrate: 3027 kb/s
    Stream #0:0: Video: mpeg2video (4:2:2), yuv422p(tv, progressive), 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 59.94 tbc
    Metadata:
      file_package_umid: 0x060A2B340101010501010D001343BF7652947134C343BF760052947134C34301
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      file_package_umid: 0x060A2B340101010501010D001343BF7652947134C343BF760052947134C34301
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, mxf, to 'out.mxf':
  Metadata:
    uid             : adab4424-2f25-4dc7-92ff-29bd000c0000
    generation_uid  : adab4424-2f25-4dc7-92ff-29bd000c0001
    timecode        : 00:00:00:00
    product_name    : OP1a Muxer
    product_version : 57.83.100
    product_uid     : adab4424-2f25-4dc7-92ff-29bd000c0002
    modification_date: 0-01-02T00:00:00.000000Z
    material_package_umid: 0x060A2B340101010501010D001343BF7652947134C343BF760052947134C34300
    company_name    : Pushp
    encoder         : Lavf57.83.100
    Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
    Metadata:
      file_package_umid: 0x060A2B340101010501010D001343BF7652947134C343BF760052947134C34301
      encoder         : Lavc57.107.100 mpeg2video
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      file_package_umid: 0x060A2B340101010501010D001343BF7652947134C343BF760052947134C34301
      encoder         : Lavc57.107.100 pcm_s16le
frame=  900 fps=407 q=24.8 Lsize=   11047kB time=00:00:30.03 bitrate=3013.6kbits/s speed=13.6x    
video:4456kB audio:5631kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 9.519076%


  


• Is there a way to convert uploaded videos to browser MP4 using most basic ffmpeg ?

  22 janvier 2016, par PeterTheLobster

  I am trying to convert videos uploaded to my website to browser friendly mp4 using ffmpeg.

  The Problem : the website is hosted by a company and it seems like it does not have the codecs I need (the ones I’m aware to be browser-friendly.) I have learned that h264 and libx264 are the codecs I would want to encode the mp4 videos to, but libx264 is not present and h264 is decodable only. Doing :

  exec("ffmpeg -codecs", $output);

  tells me that :

  D V D h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10

  I have tried converting the videos using mpeg4 codecs, but those are not supported natively in browsers it appears :

  $command ="$ffmpeg -i $target -b 1500k -vcodec mpeg4 -pix_fmt yuv420p -acodec aac -strict experimental $converted2 2>&1";
  
  exec($command, $output);

  The videos converted using the method above play only audio in chrome for example (the mpeg4 codec encoding is supported).

  Edit : I was able to convert videos to ogg and webm, but those won’t cover all browsers as far as I’m aware. Especially not the mobile ones anyway.

  Question : is there another type of basic ffmpeg, browser friendly mp4 codecs that I am not ware of or was there something wrong with my conversion $command above ? Or would I have to somehow try to install libx264 codecs and libraries ? (My guess is, that I probably cant do that to their servers, right ?)

• Real time livestreaming - RPI

  24 avril 2022, par Victor

  I work at a telehealth company and we are using connected medical devices in order to provide the doctor with real time information from these equipements, the equipements are used by a trained health Professional.

  


  Those devices work with video and audio. Right now, we are using them with peerjs (so peer to peer connection) but we are trying to move away from that and have a RPI with his only job to stream data (so streaming audio and video).

  


  Because the equipements are supposed to be used with instructions from a doctor we need the doctor to receive the data in real time.

  


  But we also need the trained health professional to see what he is doing (so we need a local feed from the equipement)

  


  How do we capture audio and video

  


  We are using ffmpeg with a go client that is in charge of managing the ffmpeg clients and stream them to a SRS server.
This works but we are having a 2-3 sec delay when streaming the data. (rtmp from ffmpeg and flv on the front end)

  


  ffmpeg settings :

  


  ("ffmpeg", "-f", "v4l2", `-i`, "*/video0", "-f", "flv", "-vcodec", "libx264", "-x264opts", "keyint=15", "-preset", "ultrafast", "-tune", "zerolatency", "-fflags", "nobuffer", "-b:a", "160k", "-threads", "0", "-g", "0", "rtmp://srs-url")


  


  My questions

  


  

  • Is there a way for this set up to achieve low latency (<1 sec) (for the nurse and for the doctor) ?

  &#xA;

  • Is the way I want to achieve this good ? Is there a batter way ?

  &#xA;

  &#xA;

  Flow schema

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  Data exchange and use case flow

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