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Sur d’autres sites (8456)

  • Copy PTS from original video stream to processed video stream using ffmpeg and opencv

    25 janvier 2019, par Krishna Prasad Yellapragada

    I have two video files in webm format. First is the original video, captured using Chrome’s MediaRecorder API. The second is a processed video generated by processing each frame of the original video using OpenCV. How do I override the PTS of frames in processed video with PTS from original video. The number of frames between the two is same.

    The processed video is generated from a sequence of images using ffmpeg.

    ffmpeg -i frames/frame_%d.png -pix_fmt yuv420p ffmpeg-cfr.mp4

    This results in a CFR of 25fps. I have tried using the steps from the link, Can I create a VFR video from timestamped images ?. This only works on mp4 videos, and not on webm. The process of encoding to MP4 and converting back to webm results in very bad video quality and takes 3x time for each video.

    Along with the sequence of images, I am also writing the PTS of the original video for each frame in a timecodes.txt file. Are there any options in ffmpeg similar to mp4fpsmod (https://github.com/nu774/mp4fpsmod) ?
    I expect that when I dump block-wise timestamps in webm for original video and processed video, the PTS for each block match between the two.

  • avconv : rename transcode_audio/video to decode_audio/video.

    18 mai 2012, par Anton Khirnov

    avconv : rename transcode_audio/video to decode_audio/video.

  • ffmpeg - output includes combined video stream from inputs but also exact video streams from inputs [closed]

    17 juillet 2024, par Will

    Hi I'm using ffmpeg to transcode some video files from prores or dv to h264/mov. Also I want to add a logo on it and make some other changes.
The command line I use is

    


    ffmpeg -i input.mov -i logo.png -c:a aac -c:v libx264 -pix_fmt yuv420p -crf 18 -map 0:a? -map 0:v -filter_complex "yadif,[1]scale=iw*1:-1[wm];[0:v:0][wm]overlay=main_w-overlay_w-5:5" -disposition:v:0 default output_h264.mov

    


    And what I got has three video streams. One for the logo,one for the video with logo which is what I want only, and one for original video.

    


    I tried the temp way to solve is to put the default video stream as the second one as you can see for -disposition:v:0 default. And it plays that stream defaultly using VLC or QuickTime. But when I tried to upload it on Vimeo or Youtube, it uses another stream to play.

    


    


    How can I change the command line to let ffmpeg only output that combined stream ? Thanks !

    


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