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Sur d’autres sites (6374)

  • convert images to video with differing time ranges

    11 juin 2013, par FaultyJuggler

    I have images coming in at random times labeled with their epoch time they were taken. I want to create a video that shows their real time creation in order. FFMPEG (far as I can tell) only allows you to set the framerate.

    For now I'm looking at creating a video file per image that is as long as the gap between the current image and the next image's timestamp, then concatenating all videos together after.

    Is there a better way to do this ?

  • Estimate time of transcoding video FFMPEG [on hold]

    9 mars 2019, par Anh Vo Nguyen Nhat

    Currently, I want to assign a video transcoding task to a computer in my distributed network. The computer are heterogeneous, so I have to check whether that computing can handle the task fast enough (during a specified deadline). My approach for this is to run many experiments and then based on the statistics I will try to estimate the time when running another task.

    I am trying to predict beforehand the time it takes when transcoding a video (e.g. transcoding 1920x1080 H264 video to 1280x720 VP9) using FFMPEG tool.
    I have used the following features to build a simple neural network to predict the time :
    - Video Resolution (Input + Output)
    - Video Duration
    - Video Codec (Input + Output)
    - Video Bitrate
    - Video Framerate
    - Number of B, I, P frames

    However, the result is not really promising. I want to ask if there is any other way to estimate/predict the time it takes when transcoding a video ? Are there any other features beside the listed that affects the transcoding time ?

  • ffmpeg cut the video and get accurate begining time of the result

    1er décembre 2022, par Pavlo Sharhan

    I do the cut via :

    


    ffmpeg -i  long_clip.mp4 -ss 00:00:10.0 -c copy -t 00:00:04.0 short_clip.mp4


    


    I need to know the precise time where did the ffmpeg do the cut (Time of the closest keyframe before the 00:00:10.0)

    


    Currently, I'm using the following ffprobe command to list all the keyframes and select the closest before 00:00:10.0

    


    ffprobe -show_frames -skip_frame nokey long_clip.mp4


    


    It works extremely slow (I run It on Jetson Nano, and It is a few minutes to list the keyframes for 30 sec video, although the cutting is done in 0.2seconds)

    


    I hope there is the much faster way to know the time of the keyframe where ffmpeg does the cut, at least because ffmpeg seeks to this keyframe and cuts the video less than in half a second.

    


    So in other words the question is : How to get the time of the keyframe where ffmpeg does the cut not listing all the keyframes ?

    


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