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• Why can I not change the number of frames (nframes) in a gganimate animation ? SOLVED

  26 décembre 2022, par Gekin

  I have produced an animation per gganimate and rendered it per ffmpeg. It works just fine, but only, if I do not change the number of frames. If I do set the number of frames, I get this error message :

  


  nframes and fps adjusted to match transition
Error parsing framerate 8,4.                           
Error: Rendering with ffmpeg failed


  


  I produced the gganim MonthlyAveragePrecipitationMap the following way :

  


  options(scipen = 999, OutDec  =  ",")

MonthlyAveragePrecipitationMap = ggplot(MonthlyAverageExtremePrecipitation) + 
  geom_path(data = map_data("world","Germany"),
            aes(x = long, y = lat, group = group)) +
  coord_fixed(xlim = c(6,15),
              ylim = c(47,55)) + 
  geom_point(aes(x=lon, y=lat, 
                 colour = ShareOfExtremePrecipitationEvents,
                 group = MonthOfYear),
             size = 3) + 
  scale_color_gradient(low="blue", high="yellow") + 
  xlab("Longitude (degree)") +
  ylab("Latitude (degree)") + 
  theme_bw() +
  transition_manual(frames = MonthOfYear) + 
  labs(title = '{unique(MonthlyAverageExtremePrecipitation$MonthOfYear)[as.integer(frame)]}', 
       color = paste0("Share of Extreme Precipitation Events \namong all Precipitation Events")) 


  


  I call the animation the following way :

  


  animate(MonthlyAveragePrecipitationMap,
        nframes = 300,
        renderer =
          ffmpeg_renderer(
            format = "auto",
            ffmpeg = NULL,
            options = list(pix_fmt = "yuv420p")))



  


  I used this exact code just a few days ago and it worked fine.

  


  Has someone had similar experiences ?
Thanks in advance.

  


  EDIT : Problem solved.

  


  

  • Problem : Changing the decimal seperator from . to , per options(dec=",")

  


  • Solution : Changing the decimal seperator locally within the axis scaling per function.

  


  


• How to set normal speed of playback after capturing and transcoding stream video by `ffmpeg_streaming` in Python project ?

  30 avril 2020, par Harley Club

  Using ffmpeg_streaming module in Python project with Flask, I try to set up video streaming from online camera into local file. My purpose is receiving input stream that comes as HLS-compatible data. To implement this property, I've inserted some code accessible by this link :

  



  import ffmpeg_streaming
from ffmpeg_streaming import Formats, Bitrate, Representation, Size

from flask import render_template, Flask, send_from_directory, abort, json, Response  

import sys

app = Flask(__name__)

video = ffmpeg_streaming.input('http://wmccpinetop.axiscam.net/mjpg/video.mjpg')

_480p = Representation(Size(854, 480), Bitrate(750 * 1024, 192 * 1024))
hls_stream = video.hls(Formats.h264(), hls_list_size = 10, hls_time = 5)
hls_stream.representations(_480p)
hls_stream.output('/var/media/hls_outputs.m3u8')


  



  It works as expected, i.e. video stream gets written into local file, then I can see what camera shot somewhere far from there...But an only problem arises here which I can't manage : once playback starts, the video is being displayed utterly fast. Nearly 2 minutes period covered by camera (I can see how long real time was over due to camera-embedded timer option) has duration of 5 seconds when playing back. So, how do I want to enable video speed just as it fits into real-world timing ? My OS is Ubuntu 18.04 LTS and I open file with preinstalled Videos app to watch content.

  


• bash script to install / update ffmpeg static builds

  1er mars 2017, par Joakim

  Hi I’m trying to make my first "real" bash script to do some real work than can be executed both manually and through cron jobs.

  The script should download and install the ffmpeg-static-build from https://johnvansickle.com/ffmpeg

  Here is what I’ve got so far :

  #!/bin/bash
  
  # Still to come, see if the script runs with root privileges else exit
  
  #Download FFMPEG static daily build and it's md5
  
  cd ~
  
  wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | tar -xf
  
  #wget https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5
  
  curl -L https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5 | tar -xf | tee -a https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz | cut -d\  -f1 | md5sum > md5sum.txt
  
  
  
  
  
  #Chech the md5 is currect
  
  #md5sum -c MD5SUMS
  
  file1="md5sum.txt"
  
  file2="ffmpeg-git-64bit-static.tar.xz.md5"
  
  
  
  if ! cmp --silent "$file1" "$file2"; then
  
      echo "md5sum doesn't match...\n exit" >&2
  
      exit 1
  
  fi
  
  
  
  
  
  #tar -xf ffmpeg-*.tar.xz
  
  cp ffmpeg-*-static/ff* /usr/bin/
  
  cp ffmpeg-*-static/ff* /usr/local/bin/
  
  cp ffmpeg-*-static/qt-faststart /usr/bin/
  
  cp ffmpeg-*-static/qt-faststart /usr/local/bin/
  
  # Consider change second location to use ln -s
  
  # Remove downloads and do some clean up
  
  
  
  rm -fr ffmpeg-*
  
  
  
  #EOF

  As you can see in the script i would like to add the md5sum check but it fails (got the md5sum check part from Compare md5 sums in bash script)

  If i remove the md5sum part the script is working, but right now the script fails at the | tar -xf | part with this code

  2017-02-28 00:10:24 (617 KB/s) - ‘ffmpeg-git-64bit-static.tar.xz’ saved [17564756/17564756]
  
  
  
  tar: option requires an argument -- 'f'
  
  Try 'tar --help' or 'tar --usage' for more information.
  
  tee: 'https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz': No such file or directory
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100    65  100    65    0     0     87      0 --:--:-- --:--:-- --:--:--    87
  
  (23) Failed writing body
  
  md5sum doesn't match...
  
   exit

  As this is my first, I would appreciate any "I’m 4 years old" advices and why

  update

  Have made some changes to the script based on the suggestions in this thread, but my problem is I have no output what so ever at this state :( So I think it’s time to ask for the next clue

  #!/bin/bash
  
  
  
  # version 0.3z
  
  
  
  ## Download FFMPEG static daily build and it's md5
  
  ## 
  
  ## To make this script working you might need to change the below values
  
  ## based on whether you are using a 32bit or 64 bit OS
  
  ## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/
  
  ## and then change those below
  
  ## 
  
  ## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment
  
  ## point 5.
  
  
  
  
  
  # a "~" means running users home folder :) and should be different from destination dir
  
  download_dir=~
  
  
  
  # as this can change if the ffmpeg is to be stored on ex. shared server
  
  dest_dir=/usr/bin/
  
  
  
  # The version it equal the filename from above link
  
  version=ffmpeg-git-64bit-static.tar.xz
  
  
  
  ## Do not change anything below here!!
  
  source_url=https://johnvansickle.com/ffmpeg/builds/${version}
  
  md5_url=https://johnvansickle.com/ffmpeg/builds/${version}.md5
  
  
  
  # Still to come, see if the script runs with write privileges else exit
  
  
  
  # 1. Can we enter download directory else exit
  
  cd ${download_dir} ||
  
  
  
          printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&2
  
          exit 1
  
  
  
  # 2. Check the md5 is correct or have changed from last check
  
  ## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,
  
  ## regardless if it is new or not, I recommend only downloading it
  
  ## if the md5 does not match. Would save John some bandwidth at least
  
  ## thx for the idea to @LordNeckbeard
  
  
  
  
  
  
  
  ## So somehow i'll guess some sed or grep only first part is nessesary :(
  
  ## This is getting more advance than expected for a first time script :/
  
  
  
  if ! diff <(md5sum ${version}) <(curl -s ${md5_url})
  
  
  
      then
  
          printf "%s\n" "md5sum doesn't match...\n
  
                          Downloading new version" >&2
  
          rm -f ${version} >&2
  
          curl ${source_url} -o ${download_dir}/${version} >&2
  
          #exit 2
  
  
  
      elif
  
          diff <(md5sum ${version}) <(curl -s ${md5_url})
  
          printf "%s\n" "Nothing new to download" >&2
  
        exit 3
  
  fi
  
  
  
  # 3. untar
  
  tar -xf ffmpeg-git-*-static.tar.xz
  
  
  
  # 4. Move builds to destination directories
  
  
  
  mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/
  
  mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/
  
  
  
  # 5. Make soft links to static builds
  
  ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart
  
  ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg
  
  ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit
  
  ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe
  
  ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver
  
  
  
  # Remove unzipped folder to do some clean up
  
  
  
  rm -fr ffmpeg-git-*-static/
  
  
  
  #EOF

  note : do to some more in depth answering of why not compile from source :
  1. This precompiled is usable on all Linux variations, despite distro and version
  2. It usable on shared hosting servers with ssh access

  UPDATE 2

      #!/bin/bash
  
  
  
  # version 0.4z
  
  
  
  ## Download FFMPEG static daily build and it's md5
  
  ## 
  
  ## To make this script working you might need to change the below values
  
  ## based on whether you are using a 32bit or 64 bit OS
  
  ## to obtain the right links you have to have a look @ https://johnvansickle.com/ffmpeg/
  
  ## and then change those below
  
  ## 
  
  ## Finished and working script should be distributed under GPLv3: free as in freedom
  
  ## 
  
  ## If you are running on a shared server or dowsn't have root priviliges you might need to uncomment
  
  ## point 5.
  
  
  
  
  
  # a "~" means running users home folder :) and should be different from destination dir
  
  download_dir=~
  
  
  
  # as this can change if the ffmpeg is to be stored on ex. shared server
  
  dest_dir=/usr/bin/
  
  
  
  # The version it equal the filename from above link
  
  version=ffmpeg-git-64bit-static.tar.xz
  
  
  
  ## Do not change anything below here!!
  
  source_url=https://johnvansickle.com/ffmpeg/builds/${version}
  
  md5="curl -s https://johnvansickle.com/ffmpeg/builds/${version}.md5"
  
  
  
  # Still to come, see if the script runs with write privileges else exit
  
  
  
  # 1. Can we enter download directory else exit
  
  cd ${download_dir} || 
  
          printf "%s\n" "You can't enter this folder.\nPlease chage download_dir in this script..." >&2
  
          exit 1
  
  
  
  # 2. Check the md5 is correct or have changed from last check
  
  ## instead of downloading ffmpeg-git-64bit-static.tar.xz every time,
  
  ## regardless if it is new or not, I recommend only downloading it
  
  ## if the md5 does not match. Would save John some bandwidth at least
  
  ## thx for the idea to @LordNeckbeard
  
  
  
  ## This is getting more advance than expected for a first time script :/
  
  
  
  if diff <(md5sum ${version}) <(${md5})
  
  
  
      then
  
          printf "%s\n" "No new version availeble" >&2
  
          exit 1
  
  
  
  elif ! diff <(md5sum ${version}) <(${md5})
  
      then
  
          rm -f ${version}
  
          curl ${source_url} > ${version}
  
          exit 0
  
  
  
          #only proceed if downloaded version match it's md5
  
          if ! diff <(md5sum ${version}) <(${md5})
  
              then
  
              rm -f ${version}
  
              printf "%s\n" "Downloaded version is damaged, try later\ndamaged version have been deleted" >&2
  
              exit 1
  
          fi
  
  
  
              # 3. untar
  
              tar -xf ffmpeg-git-*-static.tar.xz
  
  
  
              # 4. Move builds to destination directories
  
              mv ${download_dir}/ffmpeg-*-static/ff* ${dest_dir}/
  
              mv ${download_dir}/ffmpeg-*-static/qt-faststart ${dest_dir}/
  
  
  
              # 5. Make soft links to static builds
  
              ln -sfn ${dest_dir}/qt-faststart /usr/local/bin/qt-faststart
  
              ln -sfn ${dest_dir}/ffmpeg /usr/local/bin/ffmpeg
  
              ln -sfn ${dest_dir}/ffmpeg-10bit /usr/local/bin/ffmpeg-10bit
  
              ln -sfn ${dest_dir}/ffprobe /usr/local/bin/ffprobe
  
              ln -sfn ${dest_dir}/ffserver /usr/local/bin/ffserver
  
  
  
              # Remove unzipped folder to do some clean up
  
              rm -fr ffmpeg-git-*-static/
  
              printf "%s\n" "Going to install new version" >&2
  
              exit 1
  
  fi
  
  #EOF

  But still having some issues :(

  1. Running this script returns : a blanc shell, but I’ve expected one of the printf statements
  2. When I’m trying to narrow down the problem and going back to basic and trying to run the script with only the "if" part it fails with 44 : Syntax error : "(" unexpected

  3. running the very same "if" part typed directly into the shell/terminal itself it’s all happy !!
     if diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then printf "%s\n" "No new version availeble" >&2; elif ! diff <(md5sum ffmpeg-git-64bit-static.tar.xz) <(curl -s "https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz.md5"); then rm -f ffmpeg-git-64bit-static.tar.xz; curl https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-64bit-static.tar.xz > ffmpeg-git-64bit-static.tar.xz; printf "%s\n" "Going to install new version" >&2; fi

  4. I’m confused