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• When I compress ass subtitles into 1080p video, the gpu usage will get lower and lower

  5 avril 2023, par Rainfallc

  When I use it to suppress ass subtitles (subtitles that float from right to left on Chinese live broadcast websites) into a 1080p video with a duration of one hour and thirty minutes, the gpu utilization rate is getting lower and lower, ffmpeg prompts fps numbers will get lower and lower (from 68 all the way to 16) and speed will drop from 2+ to 0.3+
My GPU is NVIDIA GEFORCE 1660 SUPER, CPU is intel i5-10400
This is the command I use
ffmpeg -hwaccel cuda -c:v h264_cuvid -i 智勋勋勋勋-2023年04月03日23点30分.ts -vf scale_npp=1920:1080 -vf subtitles=智勋勋勋勋-2023年04月03日23点30分.ass -b:v 5000k -hide_banner -y -preset hq -vcodec h264_nvenc -c:a aac -b:a 320k 1234.mp4

  


  I've tried adding scale_npp, overclocking the graphics card, updating the graphics card driver, updating ffmpeg, but to no avail

  


• ffmpeg sequence of multiple filters syntax

  5 juillet 2021, par otomari

  i am trying to use multiple filters in ffpmeg, but it does not allow more than one -af.
so, then i decided to try to do it with a -complex_filter.

  


  sudo ffmpeg -f alsa -i default:CARD=Device \
  -filter_complex \
  "lowpass=5000,highpass=200; \
   volume=+5dB; \
   afftdn=nr=0.01:nt=w;" \
  -c:a libmp3lame -b:a 128k -ar 48000 -ac 1 -t 00:00:05 -y $recdir/audio_$(date '+%Y_%m_%d_%H_%M_%S').mp3


  


  it must work, but for some reason i get an error :

  


  Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, alsa, from 'default:CARD=Device':
  Duration: N/A, start: 1625496748.441207, bitrate: 1536 kb/s
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
[AVFilterGraph @ 0xaaab0a8b14e0] No such filter: ''
Error initializing complex filters.
Invalid argument


  


  i have tried quotes and others, nothing helps..

  


• FFmpeg Video Library Quick Review

  3 juillet 2019, par Rich_F

  I’m in need of reducing 18 videos so I can review them daily. I’d like to script some kind of compression or sampling using FFmpeg to not have to sit through 6 hours of video every day.

  What is the best way to review 6 hours of videos captured every day on SD cards ? The videos come in two cards, a 32 GB card ( 4 hours) and a 16 GB card ( 2 hours).

  Currently, I’m concatenating all videos and creating a screenshot every 3 seconds, which seems the longest I can go without missing something in the field of view (a vehicle will enter/leave). Still, this is thousands of images per card, and I select all, then preview and scroll down using page up/down. Any vehicle quickly appears in the thumbnails. This system isn’t bad, but I’m always inquisitive. I’m looking for more ways of sampling or seeing if any motion detection or frame analysis might register where I should be looking in my library of original captured videos.

  Options :

  1. Motion capture by analysis of frame by frame through trial and error on sensitivity to not measure wind on the bushes. This could be output to filename and time within the video (videos are captured 10 minutes long).

  2. Take my exported list of png files and string them together somehow into a slide show.

  3. Version 1 here, plus some retroactive capture of clips inside master clips.

  4. Some kind of compression. Again, I have to respect the 3-second max jump.

  Any other options that would be relatively easy to achieve without moving into any other software ? I’m trying to put the heavy lifting on the computer, as staring at videos is not something I’m finding I’ll be able to do for many days.