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• MP4 Videos on website embed with html5 does not play on iOS

  31 août 2012, par Sidner

  So I have a couple of videos on my website that I shot using the iPhone 4 and then converted to mp4, webm and ogg, so that I can use them with html5. Thing is, the video does not play at all on the 4 iOS devices that I tested and neither on Chrome for Android.

  The Chrome issue could be because some of the mp4 are actually m4v files, but still after encoding with handbrake a video to the iphone 4 presset and in mp4 format, it still does not play.

  What happens, you ask ? Well, it shows the play button crossed out with a diagonal bar, the debug console on Safari does not show any message untill I try to access the video directly. Then it says : QuickTime Movie could not be played.

  What can I do ? I have been trying to encode with ffmpeg, have tried a handful of different solutions, some even found here on stackoverlow, but to no avail. The videos do get shorter, both in display size and MBs, but nothing works to fix the issue at hand.

  I've been trying to get this corrected for a couple of weeks now. Any help and/or suggestions are welcome.

  Thank you.

  By the way, all the videos are on a registred users section of the website, but I have one for debugin on the main page, so feel free to test.

  https://sidnerwebsite.sytes.net

• [SOLVED]how do I apply watermark on multiple videos in the current directory with ffmpeg

  22 octobre 2017, par Ariane Martins Gomes Do Rego

  Linux + ffmpeg

  I have a folder with 300 videos. I need to apply the same watermark on all these videos, so in the folder I have 300 video files + 1 png file which is my watermark, how do I convert all with different names, so that the next file does not overwrite the previous one ?

  Answer :

  for f in *.mp4; do ffmpeg -i "$f" -i watermark.png -filter_complex 'overlay=10:10' -strict -2 "$f-marked.mp4"; done

  Thank you so Much. [SOLVED]

• What resolution would be best for processing videos in firebase functions ? [closed]

  11 janvier 2020, par Nathan

  I’m making an app that is mainly used for sharing videos of maximum 30 seconds long. One video example could be a screen recording of someone’s computer screen or a game. I have this code that checks whether the uploaded video that has just been uploaded to firebase storage has been processed or not and if it hasn’t then I use ffmpeg to process the video (change the resolution etc.) with this command :

  const promise = spawn('./ffmpeg', ['-i', tempFilePath, '-vf', 'scale=1280:720', targetTempFilePath]);

  Now with these commands, the firebase function is giving me a timeout error when I upload 30 second clips since I’m only converting the video to 720. I was just wondering what compression settings would be sufficient enough for the video to :

  1. Be still a high enough quality in my app
  2. Not take ages processing the video in the function (10-20 second clips works perfectly well).

  I know the better option would be to use Googles App engine or something similar to process videos but I’d prefer it to avoid that at the moment, if I can’t process videos to a good enough quality without sacrificing efficiency then I will go to something like Google’s App engine, just need some advice and some pointers for it otherwise.

  EDIT :

  I’ve seen instagram compresses their videos to a resolution of 640x640 ? Would that be reasonable or is it dependent on the original clip’s resolution ?

  Thanks