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• ffmpeg : transmission problems / artifacts in rtsp screen grab - might be a WiFi problem

  1er décembre 2022, par Jo Kerner

  In short : Is there a way to "force" ffmpeg to not save a grabbed frame if there are transmission problems ? Or any other software that does the same and I just don't know of ?

  


  Long story :

  


  Updating my house surveillance from almost 10 years old DCS-932L cameras to Tapo C100 Cameras, I changed the image delivery method from ftp push to rtsp grab via ffmpeg.

  


  I had written a program in C++ to check for "bad" pictures from the old cameras, where parts of the picture tended to be simply black once every minute or so (I'm grabbing a pic every 2 seconds). The Tapo C100 doesn't feature ftp-push, thus I tried (after a few days trying)

  


  ffmpeg.exe -y -i rtsp://user:pass@10.0.0.%ld:554/stream1 -vframes 1 %scamera\rtsp.jpg -loglevel quiet


  


  This works absolutely perfect in my main house, which features a Fritz !Box 7590 and a set of Fritz !Powerline (510/and two 540e) repeaters, plus one WiFi repeater Fritz 600) as my phone line and the router are in the basement.

  


  In my holiday home, though, it doesn't. The Wifi is managed by a Hybrid DSL/5G - box I have no alternative to, which is a Huawei DN9245W and works as DHCP Server, because this is almost impossible to change. Everything "real" is managed by another Fritz !Box 7590, connected via ethernet, and another set of Fritz !Powerline 510 and two 540e repeaters plus half a dozen Wifi Repeaters, mostly Fritz ! 310, 450E and 600. The house was partially built with local stones, which are very iron-y, and there's a lot of metallized glass. Full set is show in Image

  


  Now, this does produce different artifacts, about two per minute or in every 15th picture, see
Image with artifacts No. 1

  


  Thinking this might be a transmission problem, I tried forcing the streamgrab via TCP, because while rtsp doesn't have error correction, TCP does :

  


  ffmpeg.exe -rtsp_transport tcp -i
rtsp://user:pass@10.0.0.%ld:554/stream1 -y -f image2 -update 1 -r
1 -vframes 1 -qscale:v 30 %scamera\rtsp.jpg -loglevel quiet


  


  Which didn't change the artifacts much, see Image with artifacts No. 2

  


  The house now has a total of 12 Cameras, six of which are each "managed" by an older Dell Optiplex Desktop bought used off ebay with an i3 or i5 processor from about 2015, which goes to about 65% load. My software will check if the grabbed picture is finished saving (to RAMdisk), rename it, check if there are artifacts, if so, drop it, if not, convert to bitmap and then compare it to previous image, guess if there's a change, mark that change with a rhombus and rate it, save that as a jpeg file, and then some other stuff that's not relevant here. See : Image of my program running with six cameras

  


  I did try grabbing keyframes only, but a bunny or deer or burglar hopping through my property doesn't produce a keyframe, so that turned out to be missing the point.

  


  I'm out of ideas here. It does work flawlessly in the main house. It doesn't in the holiday house. I can hardly install more repeaters ; I already tried mesh and not-mesh, and the problem isn't exactly wifi overload, because even with just one camera running, it still persists. In certain places. Some have no problems. Reasons ? No clue. I really hope someone has a good idea.

  


• How do I know if an M3U8 link is from a live transmission or a complete file ?

  17 août 2022, par karurosagu

  This is my problem

  


  I have a downloader app, and one of it's features is downloading M3U8 links using FFmpeg under the hood

  
It only supports a selection of sites and platforms, but i don't want to add support for unknown origin links, not just because it's obviously missing the right headers, cookies and user agent and the user would have to put all of that to work, the main reason is that I don't know how to determine if that link leads to a complete file or if it leads to a live transmission


  This is what happened :

  


  A user of my app gave me a link to test it manually, i ran the code and I noteiced it was taking a lot of time to finish having a decent speed, the file was getting too big, and when i ask him where did the link came from he said it was from a Live TV stream : I had to cancel the download

  


  So, how do i know in FFmpeg if a given M3U8 link leads to a complete file rather than a live transmission ?

  


• FFMPEG.wasm Cannot Add Album Cover To MP3 File

  5 juillet 2022, par Shaan Khan

  for a project I'm working on I'm trying to split a video into multiple audio clips whilst adding metadata for each individual track. Whilst doing this, whilst I've added most of the metadata including title & artist, I'm unable to add an album cover via FFMPEG.wasm. Whilst my command works fine with regular FFMPEG.wasm, I'm unable to get it to work via the webassembly version.

  


  I'm aware that my album cover is correctly being assigned via FS.readfile and that my command in theory should work, but I'm unable to figure out why it isn't working. Is this a FFMPEG.wasm limitation and if so, is there any workaround for this ?

  


  

  • Normal FFMPEG Command

  


  


  ffmpeg -i "song.mp3" -i albumCover.jpg -map 0:0 -map 1:0 -y -codec:a libmp3lame -ac 2 -ar 48000 -ab 320k -ss 00:00:00 -t 00:00:20 -id3v2_version 3  -metadata title="SongOne" -metadata album_artist="Artist Name" -metadata album="Youtube Name" -metadata track="1" "output.mp3"


  


  

  • FFMPEG WASM Implementation

  


  


    let commandArray = [
      "-i",
      "song.mp3",
      "-i",
      "albumCover.jpg",
      "-map",
      "0:0",
      "-map",
      "1:0",
      "-y",
      "-codec:a",
      "libmp3lame",
      "-ac",
      "2",
      "-ar",
      "48000",
      "-ab",
      "320k",
      "-ss",
      startTime.toString(),
    ];

    if (duration != "-1") {
      commandArray.push("-t", duration.toString());
    }

    commandArray.push(
      "-id3v2_version",
      "3",
      "-metadata",
      `title="${title}"`,
      "-metadata",
      `album_artist="${artist}`,
      "-metadata",
      `album="${albumInfo.name}"`,
      "-metadata",
      `track="1"`,
      `${timestamp.songName} - ${timestamp.artistName}.mp3`
    );