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• Using more than 2 NV_ENC at a time with FFMPEG

  29 décembre 2022, par lowcrawler

  I'm currently generating timelapse videos using a thread on my CPU with fluent-ffmpeg running on nodejs. It takes roughly 1 minute to generate a 10 second timelapse. I'm generating many at the same time (basically one per thread) such that I tend to get the best performance at 8 worker threads. ... overall system throughput is about one video per 12 seconds.

  


  GPU processing using h264_nvenc takes the single-thread time to about 3-4 seconds. Yippie ! I went out and bought some nVidia 1660's to take advantage.

  


  Unfortunately, when I go to generate the 3rd simultaneous video, I get "Conversion Failed !" error from FFMPEG.

  


  Some basic research seems to show you can only 2 at a time. Perhaps 3 with updated drivers.

  


  Is there a method around this ? Posts from here indicates this limit is artificial and can be worked around : https://www.techpowerup.com/268495/nvidia-silently-increases-geforce-nvenc-concurrent-sessions-limit-to-3

  


  Perhaps a way to use all the cuda/tensor/etc cores to render timelapse videos instead of just relying on the limited nv_enc ?

  


• Can I pipe pygame output to a utility like ffmpeg if I am on Windows ?

  20 septembre 2015, par user89

  Usually, pygame shows its output in a specially created window. Instead of creating this window, then saving images in sequence from it, before finally feeding these images to a tool like ffmpeg, I’d like to pipe pygame’s output directly ffmpeg.

  Does what I want make sense ?

  If yes, how can I redirect pygame’s output to console ? From the documentation, I am aware of methods like pygame.Surface.get_view or pygame.Surface.get_buffer, but I don’t know what the difference is between them, and whether they are quite what I need.

  In this tutorial, a raw numpy-array based RGB representation of images is fed to ffmpeg. I figure I could do a similar thing, except instead I’d feed in some sort of RGB representation obtained from pygame.

  I know that on Linux, it’s possible to output pygame stuff to a framebuffer for display in the console ? Not sure if it is related. In any case, the effect is achieved by changing pygame drivers.

  So, I have some dots, but need to connect them.

• Insert Frame to middle of Video

  9 août 2015, par user1815241

  I have a case where I need to insert a frame (or many frames) to the middle of a video. I looked at doing ffmpeg cutting, inserting, and then concatenation but unfortunately I have a lot of cuts and the "stitch back" has a lot of choppiness. My thought was that I could leave the video "whole" and then insert frames as the exact spot(s) that I need to do that. This way I would solve the choppiness problem.

  I am currently using ffmpeg and don’t really see any way to accomplish this task with that tool. Google doesn’t seem to be providing much help either.

  Has anyone done this before ? What did you do to insert frames at specific spots.

  As an FYI - I am doing my processing in Java, using FFMPEG, and my video files are mp4 (although I could convert).

  Thank you in advance.