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• Recalculate the position of a larger object to re-align two different sized objects after rotation

  26 août 2022, par CRAIG

  I have 2 images I am placing on top of a 1080X1920 canvas.

  


  One is a rectangle that is 800x400 and it is sitting on the 1080X1920 canvas with top left coordinates of x=140 and y=1200

  


  

  


  Then I have another image that is the same size of the canvas 1080X1920, but also has a rectangle on it at the exact same coordinates as the first rectangle. I am overlaying this 1080X1920 image at x=0 and y=0 on the canvas so that the rectangle already in this image lines up perfectly with the rectangle that is already placed on the canvas.

  


  

  


  My problem is, I need to apply a rotation to both of these and the black and red rectangles need to match up in positioning AFTER the rotation is applied. Could be any rotation, but let's say it is a 15 degree rotation.

  


  When each element is placed on the canvas and then the 15 degree rotation is applied, the rectangles no longer align because of the difference in image size and the offset in rotation as they both rotate around the center point which looks to be my only option in this case.

  


  

  


  So I am hoping to sort out a formula I can use that would rectify the positioning of the 1080X1920 image so that the object already embedded in that image lines up with separately overlaid image.

  


  There are of course other ways to deal with this problem, but right now, they would make things quite a bit more difficult, so I wanted to see if this was possible to calculate first.

  


  I have tried several ways to calculate this, but am not super mathematically proficient, so I am grasping at straws at best.

  


  Oh and because I am not extremely mathematically proficient, any dumbing-down of mathematical terms is appreciated. ;)

  


  Oh and possibly this post answers this question, but I can't wrap my head around whether or not it does, so if someone can let me know if it does, I will try harder to understand and apply it to my particular case.

  


  How to recalculate the coordinates of a point after scaling and rotation ?

  


• FileNotFoundError on aws Lambda when concatenating videos with ffmpeg

  2 juillet 2021, par Shibu Menon

  Goal :

  



  

  • Concat 2 videos (both are in an s3 bucket) via aws Lambda using ffmpeg

  


  • Upload the resultant output.mp4 to another S3 bucket

  


  • Python 3+

  


  



  I've already created a layer containing a static ffmpeg

  



  The Error :

  



  {
  "errorMessage": "[Errno 2] No such file or directory: '/tmp/output.mp4'",
  "errorType": "FileNotFoundError",
  "stackTrace": [
    [
      "/var/task/lambda_function.py",
      19,
      "lambda_handler",
      "s3.Object(bucketLowRes, mp4OutputFileName).put(Body=open(new_file_key, 'rb'))"
    ]
  ]
}


  



  My Lambda function :

  



  import json
import os
import subprocess
import boto3

s3 = boto3.resource('s3')
bucketLowRes = s3.Bucket("bucket-conc-lowres")

def lambda_handler(event, context):
    # TODO implement

    mp4OutputFileName = 'output.mp4'

    new_file_key = os.path.abspath(os.path.join(os.sep, 'tmp', mp4OutputFileName))
    subprocess.call( ['/opt/ffmpeg', '-i', 'concat:s3://bucket-word-clips/00th76kqwfs915hbixycb77y9v3riwsj30.mp4|s3://bucket-word-clips/00uoakp6jyafbu13ycvl6w2i9tj42eux30.mp4', new_file_key ] )

    s3.Object(bucketLowRes, mp4OutputFileName).put(Body=open(new_file_key, 'rb'))

    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
    }


  



  Question :

  



  

  • FileNotFoundError : Where is the output mp4 file of my ffmpeg concat being saved ??

  


  • And if it is being saved to /tmp/output.mp4 , then why the FileNotFoundError ??

  


  



  thanks

  


• Ffmpeg examples run in debug mode [on hold]

  25 août 2017, par Saeid Zangeneh

  I’m not so professional in c and cpp. I want to run FFmpeg official examples but there are many errors on include files. I can’t solve them.

  below output :when i try to run or debug the sample code

  debug output :

  cd '/home/saeid/NetBeansProjects/CppApplication_2'
  
  /usr/bin/make -f Makefile CONF=Debug
  
  "/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-  conf
  
  make[1]: Entering directory '/home/saeid/NetBeansProjects
  
  /CppApplication_2'
  
  
  
  "/usr/bin/make"  -f nbproject/Makefile-Debug.mk dist/Debug/GNU-
  
  Linux/cppapplication_2
  
  
  
  make[2]: Entering directory '/home/saeid/NetBeansProjects
  
  /CppApplication_2'
  
  
  
  mkdir -p dist/Debug/GNU-Linux
  
  
  
  gcc     -o dist/Debug/GNU-Linux/cppapplication_2 build/Debug/GNU-
  
  Linux/sample.o 
  
  
  
  build/Debug/GNU-Linux/sample.o: In function `select_channel_layout':
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:87: undefined 
  
  reference to `av_get_channel_layout_nb_channels'
  
  
  
  build/Debug/GNU-Linux/sample.o: In function `audio_encode_example':
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:112: undefined 
  
  reference to `avcodec_find_encoder'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:117: undefined 
  
  reference to `avcodec_alloc_context3'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:127: undefined 
  
  reference to `av_get_sample_fmt_name'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:134: undefined 
  
  reference to `av_get_channel_layout_nb_channels'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:136: undefined 
  
  reference to `avcodec_open2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:146: undefined 
  
  reference to `av_frame_alloc'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:156: undefined 
  
  reference to `av_samples_get_buffer_size'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:162: undefined 
  
  reference to `av_malloc'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:169: undefined 
  
  reference to `avcodec_fill_audio_frame'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:179: undefined 
  
  reference to `av_init_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:183: undefined 
  
  reference to `sin'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:189: undefined 
  
  reference to `avcodec_encode_audio2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:196: undefined 
  
  reference to `av_free_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:201: undefined 
  
  reference to `avcodec_encode_audio2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:208: undefined 
  
  reference to `av_free_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:212: undefined 
  
  reference to `av_freep'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:213: undefined 
  
  reference to `av_frame_free'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:214: undefined 
  
  reference to `avcodec_close'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:215: undefined 
  
  reference to `av_free'
  
  
  
  build/Debug/GNU-Linux/sample.o: In function `audio_decode_example':
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:229: undefined 
  
  reference to `av_init_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:232: undefined 
  
  reference to `avcodec_find_decoder'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:237: undefined 
  
  reference to `avcodec_alloc_context3'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:243: undefined 
  
  reference to `avcodec_open2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:254: undefined 
  
  reference to `av_free'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:264: undefined 
  
  reference to `av_frame_alloc'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:269: undefined 
  
  reference to `avcodec_decode_audio4'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:276: undefined 
  
  reference to `av_get_bytes_per_sample'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:305: undefined reference to `avcodec_close'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:306: undefined reference to `av_free'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:307: undefined reference to `av_frame_free'

  build/Debug/GNU-Linux/sample.o : In function `video_encode_example’ :

  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:323: undefined reference to `avcodec_find_encoder'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:328: undefined reference to `avcodec_alloc_context3'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:350: undefined reference to `av_opt_set'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:352: undefined reference to `avcodec_open2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:361: undefined reference to `av_frame_alloc'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:371: undefined reference to `av_image_alloc'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:379: undefined reference to `av_init_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:399: undefined reference to `avcodec_encode_video2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:407: undefined reference to `av_free_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:413: undefined reference to `avcodec_encode_video2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:421: undefined reference to `av_free_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:427: undefined reference to `avcodec_close'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:428: undefined reference to `av_free'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:429: undefined reference to `av_freep'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:430: undefined reference to `av_frame_free'
  
  
  
  build/Debug/GNU-Linux/sample.o: In function `decode_write_frame':
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:452: undefined reference to `avcodec_decode_video2'

  build/Debug/GNU-Linux/sample.o : In function `video_decode_example’ :

  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:481: undefined reference to `av_init_packet'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:486: undefined reference to `avcodec_find_decoder'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:491: undefined reference to `avcodec_alloc_context3'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:502: undefined reference to `avcodec_open2'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:511: undefined reference to `av_frame_alloc'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:545: undefined reference to `avcodec_close'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:546: undefined reference to `av_free'
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:547: undefined reference to `av_frame_free'
  
  
  
  build/Debug/GNU-Linux/sample.o: In function `main':
  
  
  
  /home/saeid/NetBeansProjects/CppApplication_2/sample.c:556: undefined 
  
  reference to `avcodec_register_all'
  
  
  
  collect2: error: ld returned 1 exit status
  
  
  
  nbproject/Makefile-Debug.mk:62: recipe for target 'dist/Debug/GNU-
  
  Linux/cppapplication_2' failed
  
  
  
  make[2]: *** [dist/Debug/GNU-Linux/cppapplication_2] Error 1
  
  
  
  make[2]: Leaving directory '/home/saeid/NetBeansProjects/CppApplication_2'
  
  
  
  nbproject/Makefile-Debug.mk:59: recipe for target '.build-conf' failed
  
  
  
  make[1]: *** [.build-conf] Error 2
  
  
  
  make[1]: Leaving directory '/home/saeid/NetBeansProjects/CppApplication_2'
  
  
  
  nbproject/Makefile-impl.mk:39: recipe for target '.build-impl' failed
  
  
  
  make: *** [.build-impl] Error 2