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Sur d’autres sites (9245)

  • frame extracted from a video using opencv or ffmpeg is vague, picture i snip from video is clear

    15 avril 2024, par user11317826

    I record a video from roadside, and I want to recognize plate license in video. but I find that if I extract every frame from video using python, the frame is too vague to recognize.

    


    I have tried opencv and ffmpeg -i input.mp4 -ss 00:00:10.000 -vframes 1 output.png
`

    


    enter image description here

    


    but if I snip video every second the picture is clear

    


    enter image description here

    


    what's the reason of this phenomenon, how can I fix it

    


    I have tried frame average, it didn't work

    


  • How to replace the video track of a part of a video file ?

    17 juin 2019, par yukashima huksay

    I have an mp4 file like this(same format but longer) :

    Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'N1.2.mp4':
    
  Metadata:
    
    major_brand     : mp42
    
    minor_version   : 0
    
    compatible_brands: mp42mp41
    
    creation_time   : 2018-10-31T13:44:21.000000Z
    
  Duration: 00:28:54.21, start: 0.000000, bitrate: 10295 kb/s
    
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 9972 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
    
    Metadata:
    
      creation_time   : 2018-10-31T13:44:21.000000Z
    
      handler_name    : ?Mainconcept Video Media Handler
    
      encoder         : AVC Coding
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    
    Metadata:
    
      creation_time   : 2018-10-31T13:44:21.000000Z
    
      handler_name    : #Mainconcept MP4 Sound Media Handler

    I also have another video file that is 3 minutes long. and has no audio. What is the fastest way to encode the other video in a way that it is encoded like my main video and then replace the last three minutes of the video track of my original video with this ?

    In other words.
    I have video A that is 1 hour long. With the encoding shown above.

    I have video B that is 3 minutes long with no audio. with a random encoding.

    I want to have video C with the same encoding and same audio as A. But it’s video track would be the first 57 minutes of A + B(which is 3 minutes).

    I want to do this as fast as possible so I would like to not re encode A.

    I know how to concatenate two videos, I use this command :

    ffmpeg -f concat -i files.txt -c copy res.mp4

  • FFMPEG Can I overlay an image larger than a video, on a video ?

    5 mars 2019, par vadus1

    Can I overlay an image larger than a video, on a video ?

    I have a mp4 file with 320x*,

    It turns out I can not find out the height of the video, that crop the image for the overlay video.

    ffmpeg -i input.mp4 -i transback.png -filter_complex "[0:0] scale=320:-2 [wm]; [1:0] scale=320:-2:force_original_aspect_ratio=decrease [prog], [wm][prog]overlay" fart.mp4

    I will try to execute this command, but not luck ;
    I got it.

    enter image description here

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