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• Low FPS output using ffmpeg and a raspi camera

  23 novembre 2019, par Newe

  I am building a surveillance camera for a school project, which is based on a raspberry pi and a infrared raspberry Pi camera.

  I am capturing the camera’s video stream and outputting it as an HLS stream directly from ffmpeg. However, the resulting video is really low fps ( 5 at max)

  Strangely, raspivid manages to ouput a 60fps 720p stream without any problem, but when put through ffmpeg for streaming, the video is cropped in half and i cannot get it to show up entirely.

  Here is the ffmpeg command i use :

  #!/bin/bash
  
  ffmpeg -v verbose \
  
  -re \
  
  -i /dev/video0 \
  
  -c:v libx264 \
  
  -an \
  
  -f hls \
  
  -g 10  \
  
  -sc_threshold 0 \
  
  -hls_time 1 \
  
  -hls_list_size 4 \
  
  -hls_delete_threshold 1 \
  
  -hls_flags delete_segments \
  
  -hls_start_number_source datetime \
  
  -hls_wrap 15 \
  
  -preset superfast \
  
  -start_number 1 \
  
  /home/pi/serv/assets/stream.m3u8

  And the resulting log output (notice the fps)

  

  Here is the command using raspivid that i tested, based on a blog post i read :

  raspivid -n \
  
  -t 0 \
  
  -w 960 \
  
  -h 540 \
  
  -fps 25 \
  
  -o - | ffmpeg \
  
  -v verbose \
  
  -i - \
  
  -vcodec copy \
  
  -an \
  
  -f hls \
  
  -g 10 \
  
  -sc_threshold 0 \
  
  -hls_time 1 \
  
  -hls_list_size 4 \
  
  -hls_delete_threshold 1 \
  
  -hls_flags delete_segments \
  
  -hls_start_number_source datetime \
  
  -hls_wrap 15 \
  
  -preset superfast \
  
  -start_number 1 \
  
  /home/pi/serv/assets/stream.m3u8

  I am not a ffmpeg expert and am open to any suggestions that would help improve the stream’s quality and stability :)

• Making a timelapse by drag and drop - A rebuild of an old script using ImageMagick

  14 août 2019, par cursor_major

  I have written an apple script previously to automate a task I do in my work many times.

  I shoot Raw + JPG in camera, copy to hard drive.

  I then drag named and dated folder eg. "2019_08_14_CAM_A_CARD_01" on to an automator app and it divides the files in to folders "NEF" and "JPG" respectively.

  I then drag the appropriate "JPG" folder onto my Timelapse app and it runs the image sequence process in QT7 and then saves the file with the parent folder name in the grandparent folder. This keeps things super organised for when I want to re link to the original RAW files.

  [code below]

  It is a 2 step process and works well for my needs, however, Apple are going to be resigning Quicktime 7 Pro so my app has a foreseeable end of life.

  I want to take this opportunity to refine and improve the process using terminal and ImageMagick.

  I have managed to work some code that runs well in terminal, but I have to navigate to the folder first then run a script. It doesn’t do the file renaming and doesn’t save in the right place.

  Also, when I try and run the simple script in an automator ’App’ it throws up errors even before trying to add anything clever with the file naming.

  Later, once I have recreated my timelapse. maker app I want to get clever with more of ImageMagicks commands and overlay a small super of the original frame name in the corner so I can expedite my reconnecting workflow.

  I’m sorry, I’m a photographer not a coder but I’ve been bashing my head trying to work this out and I’ve hit a brick wall.

  File Sorter

      repeat with d in dd
  
          do shell script "d=" & d's POSIX path's quoted form & "
  
  cd \"$d\" || exit
  
  
  
  mkdir -p {MOV,JPG,NEF,CR2}
  
  find . -type f -depth 1 -iname '*.mov' -print0 | xargs -0 -J % mv % MOV
  
  find . -type f -depth 1 -iname '*.cr2' -print0 | xargs -0 -J % mv % CR2
  
  find . -type f -depth 1 -iname '*.jpg' -print0 | xargs -0 -J % mv % JPG
  
  find . -type f -depth 1 -iname '*.nef' -print0 | xargs -0 -J % mv % NEF
  
  
  
  for folder in `ls`; 
  
  do if [ `ls $folder | wc -l` == 0 ]; then 
  
      rmdir $folder;
  
  fi; done;
  
  
  
  "
  
      end repeat
  
  end open```
  
  
  
  
  
  
  
  Timelapse Compiler
  
  
  
  ```on run {input, parameters}
  
      repeat with d in input
  
          set d to d's contents
  
          tell application "Finder"
  
              set seq1 to (d's file 1 as alias)
  
              set dparent to d's container as alias
  
              set mov to "" & dparent & (dparent's name) & ".mov"
  
          end tell
  
          tell application "QuickTime Player 7"
  
              activate
  
              open image sequence seq1 frames per second 25
  
              tell document 1
  
                  with timeout of 500 seconds
  
                      save self contained in file mov
  
                  end timeout
  
                  quit
  
              end tell
  
          end tell
  
      end repeat
  
      return input
  
  end run```
  
  
  
  
  
  Current code that runs from within Terminal after I have navigated to folder of JPGs
  
  
  
  ```ffmpeg -r 25 -f image2 -pattern_type glob -i '*.JPG' -codec:v prores_ks -profile:v 0 imagemagick_TL_Test_01.mov```

• How can I make windows "like" the mp4 files I create in Linux and sync with Rsync

  17 juillet 2019, par Geoff Fox

  I am a meteorologist on TV remotely from a studio I built. My control room uses a TriCaster, an amazing studio-in-a-box which runs on a Windows 7 variant. I make my weather maps myself on a Centos 7 machine — around 40,000/day.

  I don’t entirely understand the problem, but here’s a quote from someone helping me at NewTek (the TriCaster company)

  Rsync is built on a *nix based environment where all the file permissions and attributes are based on the Linux environment. There is no meaning for this in NTFS and Windows. The result is you get files that will most likely have the read-only flag set or no flag at all. Other attributes will be delivered as null. I’m sure from your own programming experience, programs don’t like null values and they generally have to be accounted for very specifically.

  And so the finely tuned TriCaster stumbles, meaning lost frames or other problems caused by my short weather animations.

  Here are some samples of the Rsync code I use

  rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/conus*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/nebraska*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/northernplains*.mp4 /mnt/tricaster/Clips/Import

  These are mp4 files. They are only used locally. I really don’t care what flags are checked and permissions filled as long as Windows 7 doesn’t care.

  At this point I always like to tell folks, though I do write some code my last computer class was in high school,’67-68 semester. Thanks in advance for your help.