Sur d’autres sites (6124)

• Creating an ffmpeg html/php form process and need ffmpeg technical feedback

  7 juin 2016, par dave

  I have decided to create an input form for ffmpeg to go with my video uploader.

  This is for my video uploader plugin for a social site software. Users have told me that they want technical options for videos so they can choose the specific options they want including thumbnail options.

  I have been reading the ffmpeg docs most of the morning as well as watching some videos and i have come up with a rough draft of my form. The videos uploaded will more than likely be non gaming, personal and hobby videos.

  The goal here is to have a form that is easy enough for the non technical user, but technical for those that want the options. So i do plan to have a checkbox which allows the non technical user to skip the technical settings. This will result in a generic ffmpeg command with default settings. If they choose to use the technical specs then it will create a more specific ffmpeg command stream.

  here is what i have so far in the draft.

  select max size options ’50MB’,’100MB’,’200MB’,’500MB’,’650MB’,’750MB’,’1GB’,’2GB’,’3GB’

  input for thumbcapture in seconds maxlength 2 size 2

  input for video in ’mpg’,’wma’,’mov’,’flv’,’mp4’,’avi’,’qt’,’wmv’,’rm’

  option for video size ’200x100’,’320x240’,’560x315’,’640x360’,’853x480’,’1280x720’ not sure if i want to offer a custom slot or not.

  my thought here is that if they do not want the tech version of the form then the codecs will be b:v copy b:a copy (if that is the smart way to do it) or just left out and let ffmpeg decide what is best.

  ===== this is the technical part of the form =======

  select for acodec options copy, mp3, mp1, mp2, dnet, 28_8, wmav2, alac, cook

  select for vcodec option copy, ffv1, ms-cram, mpeg-4, rv40, wmv, xvid, mov, qt, avchd

  select for bitrate audio 32k, 64k, 128k

  select for bitrate video 1000k, 1200k, 1500k

  select for sampling rate 22050, 44100

  input for crf(mp4 out only) size 2 maxlength 2 minval 2 maxval 49

  input for avi quantanizer (avi out only) size 2 maxlength 2 minval 2 maxval 49

  ===== end technical form =====================

  select for video out ’avi’,’mp4’,’flv’

  that is what i have so far. How does that combination on the technical side look to you ffmpeg pros ?

  Any suggestions ? :)

• OpenCV VideoWriter Not Writing to Output.avi

  20 mai 2020, par R.Zane

  I'm attempting to write a simple bit of code that takes a video, crops it, and writes to an output file.

  



  System Setup :

  



  OS: Windows 10
Conda Environment Python Version: 3.7
OpenCV Version: 3.4.2
ffmpeg Version: 2.7.0


  



  File Input Specs :

  



  Codec: H264 - MPEG-4 AVC (part 10)(avc1)
Type: Video
Video resolution: 640x360
Frame rate: 5.056860


  



  Code failing to produce output (it creates the file but doesn't write to it) :

  



  import numpy as np
import cv2

cap = cv2.VideoCapture('croptest1.mp4')

# Define the codec and create VideoWriter object
fourcc = cv2.VideoWriter_fourcc('F', 'M', 'P', '4')
out = cv2.VideoWriter('output.avi', fourcc, 20.0,
                      (int(cap.get(3)), int(cap.get(4))))

# Verify input shape
width = cap.get(3)
height = cap.get(4)
fps = cap.get(5)
print(width, height, fps)

while(cap.isOpened()):
    ret, frame = cap.read()
    if ret == True:
        # from top left =frame[y0:y1, x0:x1]
        cropped_frame = frame[20:360, 0:640]

        # write the clipped frames
        out.write(cropped_frame)

        # show the clipped video
        cv2.imshow('cropped_frame', cropped_frame)
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break
    else:
        break

# Release everything if job is finished
cap.release()
out.release()
cv2.destroyAllWindows()


  



  Variations to fourcc and out variables tried to get codec to work :

  



  fourcc = cv2.cv.CV_FOURCC(*'DIVX')
fourcc = cv2.VideoWriter_fourcc(*'DIVX')

out = cv2.VideoWriter('ditch_effort.avi', -1, 20.0, (640, 360))


  



  Based on this link I should be able to refer to this fourcc reference list to determine the appropriate fourcc compression code to use. I have tried a bunch of variations, but cannot get the output file to be written. When I run the code, the #verify input shape variables print the corresponding 640, 360 and correct Frame Rate.

  



  Can any one tell me what my issue is...would be much appreciated.

  


• Joining/Concatenating more than one video files in Java Spring Boot

  7 décembre 2020, par Rohan Shah

  I am trying to join/concate multiple files in Java, so far the procedure that I was following (https://github.com/bramp/ffmpeg-cli-wrapper) was going alright, but in this procedure, there were a couple of lines that I could not understand.

  


  Code I am following :

  


  FFmpeg ffmpeg = new FFmpeg("/path/to/ffmpeg");
FFprobe ffprobe = new FFprobe("/path/to/ffprobe");

FFmpegBuilder builder = new FFmpegBuilder()

  .setInput("input.mp4")     // Filename, or a FFmpegProbeResult
  .addInput("input2.mp4")    // <--------------------------------  Second file that I added
  .overrideOutputFiles(true) // Override the output if it exists

  .addOutput("output.mp4")   // Filename for the destination
    .setFormat("mp4")        // Format is inferred from filename, or can be set
    .setTargetSize(250_000)  // Aim for a 250KB file

    .disableSubtitle()       // No subtiles

    .setAudioChannels(1)         // Mono audio
    .setAudioCodec("aac")        // using the aac codec
    .setAudioSampleRate(48_000)  // at 48KHz
    .setAudioBitRate(32768)      // at 32 kbit/s

    .setVideoCodec("libx264")     // Video using x264
    .setVideoFrameRate(24, 1)     // at 24 frames per second
    .setVideoResolution(640, 480) // at 640x480 resolution

    .setStrict(FFmpegBuilder.Strict.EXPERIMENTAL) // Allow FFmpeg to use experimental specs
    .done();

FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);

// Run a one-pass encode
executor.createJob(builder).run();

// Or run a two-pass encode (which is better quality at the cost of being slower)
executor.createTwoPassJob(builder).run();


  


  These are the lines throwing error :

  


  FFmpeg ffmpeg = new FFmpeg("/path/to/ffmpeg");
FFprobe ffprobe = new FFprobe("/path/to/ffprobe");


  


  In these lines, I am providing a path like this,

  


  FFmpeg ffmpeg = new FFmpeg("D:/");
FFprobe ffprobe = new FFprobe("D:/");


  


  which leads to an error

  


  java.io.IOException: CreateProcess error=5


  


  I believe the ffmpeg in /path/to/ffmpeg and ffprobe in /path/to/ffprobe are files, not directories, which is why it threw an execution permission error, but as I looked into the repository (link given above) I was not able to find this particular file in the given link.

  


  There were a couple of Java files named ffmpeg.java and ffprobe.java, but when I tried using them in the code then I got the same error, so I want to know which files am I supposed to have in these paths