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• Produce high quality GIF with Fluent FFmpeg

  3 mars 2023, par Mensur

  I'm trying to generate high quality GIF's with Fluent FFmpeg, which is a wrapper for FFmpeg for Nodejs and i'm stuck.
What i need to do is add to add palletegen & palleteuse and i found a great example how this can be use directly in FFmpeg here.

  


  However, I need help to add this in fluent ffmpeg code below. Does anyone have any example how I can produce high quality GIF's with fluent ffmpeg below ? The code below is generating GIF's but not that high quality.

  


      const inputPath = videoname + ".mp4";
    const outputPath = videoname + ".gif";
    const startTime = "00:00:05";
    const duration = "00:00:08";
    const fps = 10;

    ffmpeg(videotemp)
    .setStartTime(startTime)
    .setDuration(duration)
    .fps(fps)
    .size("500x300")
    .output(outputPath)
    .on("end", () => {
        console.log("Video has been converted to " +outputPath+ " animation successfully!");
    })
    .on("error", (err) => {
        console.log("Error: " + err.message);
    })
    .run();


  


• lavc : disable an obsolete hack for real video

  20 février 2023, par Anton Khirnov

  lavc : disable an obsolete hack for real video
  AVCodecContext.slice_count,offset are unneeded since 2007, commit
  
  383b123ed37df4ff99010646f1fa5911ff1428cc and following. Deprecate those
  
  fields.
  

  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/options_table.h
  • [DH] libavcodec/pthread_frame.c
  • [DH] libavcodec/rv10.c
  • [DH] libavcodec/rv34.c
  • [DH] libavcodec/version_major.h

• Simultaneously map video and data streams to one subprocess pipeline in real-time

  9 février 2023, par seabass1217

  I need to process the video stream and the klvdata streams simultaneously in real-time in OpenCV/Python. I'm using FFMPEG to read the file or stream as OpenCV does not retain the klvdata. I pass the data to OpenCV with the subprocess module.

  


  My problem is I cannot figure out how to map both the video and klvdata to the same subprocess pipe simultaneously ?

  


  My code :

  


  #!/usr/bin/env python3
import sys, json, klvdata;
from subprocess import PIPE
import subprocess as sp
import cv2
import numpy

command = ['ffmpeg',
    '-i', 'DayFlight.mpg',
    '-map', '0:0',
    '-map', '0:d',        
    '-pix_fmt', 'bgr24',
    '-c:v', 'rawvideo',      
    '-an','-sn',              
    '-f', 'image2pipe', '-',
    '-c:d', 'copy',
    '-f','data',
    ]

pipe = sp.Popen(command, stdin=sp.PIPE, stdout=sp.PIPE, stderr=sp.PIPE, bufsize=10**8)

while True:
   raw_image = pipe.stdout.read(1280*720*3)
   image =  numpy.fromstring(raw_image, dtype='uint8')
   image = image.reshape((720,1280,3))          
   if image is not None:
      cv2.imshow('Video', image)
   if cv2.waitKey(1) & 0xFF == ord('q'):
      break
   for packet in klvdata.StreamParser(pipe.stdout): 
      metadata = packet.MetadataList()
      print(metadata)
pipe.stdout.flush()
cv2.destroyAllWindows()



  


  Produces the below error :

  


  Traceback (most recent call last):&#xA;  File "test_cv.py", line 32, in <module>&#xA;    metadata = packet.MetadataList()&#xA;AttributeError: &#x27;UnknownElement&#x27; object has no attribute &#x27;MetadataList&#x27;&#xA;&#xA;</module>

  


  Any help is greatly appreciated.