Recherche avancée

Sur d’autres sites (6905)

• FFMPEG image to video with kenburns effect

  11 novembre 2019, par Buu

  I am new to FFMPEG and I kinda confused with their commands and options. So I googled some existing commands and found this :

  ffmpeg -y -loop 1 -i bgimage.png -ss 0 -t 5 -r 1 -loop 1 -i front.png -ss 0 -t 5 -filter_complex " [1:v] scale=w=1920:h=1080 [fg]; [0:v] scale=w=-2:h=3*1080 , crop=w=3*1920/1.2:h=3*1080/1.2:y=t*(in_h-out_h)/5, scale=w=1920:h=1080, setsar =1 [bg] ; [bg][fg]overlay=shortest=1[v] " -map "[v]" -c:v h264 -crf 18 -preset v eryfast pan_up.mp4

  The only problem is effects becomes sluggish.

  I am trying to convert image to video with kenburns effects. Can you guys help me out ? Calling ffmpeg masters here in SO. Your help will be greatly appreciated. Thank you so much !

  Here’s the sample video I want to achieved, https://trello-attachments.s3.amazonaws.com/545a93cff0b222f456c5ad82/5d8cfc0d75e80e63dae2fe6a/5a523ed328f24b0454c5c56cd0ee68e6/23442279.mp4

• An H264 encoded MP4 file cannot be played by VLC/HTML5 browsers, is there any header or meta data I can add to fix it ? [migrated]

  5 avril 2015, par user534498

  I have an MP4 file, which is H264 encoded. I saved the file from RTP streams, with sprop-property-sets in front, and followed by frames. (Note. VLC can directly play the RTP stream without problem.)

  The file can be played by "Videos" program in Linux. If I play it with VLC 2.1.4 in Linux, it shows the following error.

  No suitable decoder module : VLC does not support the audio or video
  format "undf". Unfortunately there is no way for you to fix this.

  I then open VLC, from preference menu, I change the Demuxer (demultiplexer) from automatic to "H264 Video Demuxer". VLC can then play it.

  So it seems that the problem is VLC cannot automatically detect a demuxer from the video file. However, I am sure that my video file has only video data, and it doesn’t even have audio (may not even need a demuxer ?)

  I put this file in HTTP server, and use "video" tag for testing, all IE, chrome and firefox browsers cannot play this file, and I guess it’s the same reason as VLC cannot play it.

  So is there a way to fix it ? For example, is there any place I can add a header to tell VLC or similar players to choose H264 video demuxer ?

  Thanks.

• Compression of a video with constant background

  28 juin 2017, par Spirou003

  (sorry if my english is bad, I can read it but I don’t write it quite well...)

  I want to compress some videos, which have two particularities :

  • there is a background that covers 90% of the area, during the whole video
  • most of the others elements can be separately described by a picture in move

  My videos are like this one, and don’t have audio. As you can see, almost everything can be described only by using a fixed background, few small images in move, plus a noise. Moreover, this noise will be almost nul and then an entropic coding would be very efficient. I think it will produce tiny files (< 5 Mo) even if the duration is in hours, a result that is very appreciable since I have actually recorded 30h of game (actual size is 3 Go).

  Is there any way to get new video files, that benefit of these informations ? If yes, what are the implication of a such encoding for watching these videos with Windows Media Player, or for usage with ffmpeg ?

  I searched with Google after anything that can help me, but I don’t know which keyword I can use for this, then I didn’t found anything usefull :-(

  Thanks in advance :-)

  PS : another example, the video is accelerated but shows the interesting moves