16 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 10:57
  How can I decode audio-file with ffmpeg? - skltynve Newest 'ffmpeg' Questions - Stack Overflow
  I need to decode audio-file in C using library ffmpeg so I have array of numbers. How can I do that?
• 10:05
  sws_scale YUV --> RGB distorted image - Sami susu Newest 'ffmpeg' Questions - Stack Overflow
  I want to convert YUV420P image (received from H.264 stream) to RGB, while also resizing it, using sws_scale. The size of the original image is 480 × 800. Just converting with same dimensions works fine. But when I try to change the dimensions, I get a distorted image, with the following pattern: changing to 481 × 800 will yield a distorted B&W image which looks like it's cut in the middle 482 × 800 will be even more distorted 483 × 800 is distorted but in color 484 × 800 is ok (scaled correctly). Now (...)
• 08:30
  How to minimize the delay in a live streaming with ffmpeg - Pasquale C. Newest 'ffmpeg' Questions - Stack Overflow
  i have a problem. I would to do a live streaming with ffmpeg from my webcam. I launch the ffserver and it works. From another terminal I launch ffmpeg to stream with this command and it works: sudo ffmpeg -re -f video4linux2 -i /dev/video0 -fflags nobuffer -an http://localhost:8090/feed1.ffm In my configuration file I have this stream: Feed feed1.ffm Format webm NoAudio VideoCodec libvpx VideoSize 720x576 VideoFrameRate 25 # Video settings VideoCodec libvpx VideoSize 720x576 # Video (...)
• 07:36
  Image mask blur processing problem using ffmpeg - andrew kim Newest 'ffmpeg' Questions - Stack Overflow
  I want to apply blur using masking to two or more points in the image. I want to use a circular or other type of blur in ffmpeg rather than a box blur. I wrote the ffmpeg code, but an error continued. When there is only one blur, it works correctly, but when there are two or more blurs, an error occurs. No matter how much I search, I can't figure it out, so I'd like to ask for help. The ffmpeg code I wrote is as follows. ffmpeg -i input.mp4 -i mask.png -filter_complex "` [1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1]; (...)
• 07:29
  does ffmpeg support yuv420sp12le (p012le) - qianqian zhang Newest 'ffmpeg' Questions - Stack Overflow
  does ffmpeg support yuv420sp12le, like p010le, is the ffmpeg support p012le, i.e. 12bpp per component, U and V are interleaved. I see the pixfmt.h of version 5.0, seems there is no format p012le, I see format p016l, 16bpp per component.
• 08:55
  FFmpeg C++ API : Using HW acceleration (VAAPI) to transcode video coming from a webcam [closed] - nicoh Newest 'ffmpeg' Questions - Stack Overflow
  I'm actually trying to use HW acceleration with the FFmpeg C++ API in order to transcode the video coming from a webcam (which may vary from one config to another) into a given output format (i.e: converting the video stream coming from the webcam in MJPEG to H264 so that it can be written into a MP4 file). I already succeeded to achieve this by transferring the AVFrame output by the HW decoder from GPU to CPU, then transfer this to the HW encoder input (so from CPU to GPU). This is not so optimized and on top of that, for the given above config (MJPEG => H264), I (...) -- https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/vaapi_transcode.c
• 06:48
  fluent-ffmpeg video has stretched image - Martin Newest 'ffmpeg' Questions - Stack Overflow
  I have an mp3 audio file and a jpg image file. I want to combine these two files into a new mp4. I have a working fluent-ffmpeg command that does exactly what I want, except somethings an image will be stretched in the final output video. It seems to happen consistently with jpgs I export from photoshop. Is there any way I can specify in my ffmpeg command to keep the same resolution of my image and not to stretch it? My function below: async function debugFunction() console.log('debugFunction()') //begin setting up ffmpeg const ffmpeg = (...) -- ,
• 06:04
  Why does -filter:v fps=60 need re-encoding? - kwjsksai Newest 'ffmpeg' Questions - Stack Overflow
  I mean, let's say 30 fps -> 60 fps. You just need to duplicate frames. Decode a frame and present it at 2 timepoints. I know mp4 can present a frame at different timepoints, right? So why is re-encoding needed? with h264 codec and heavy computing... I thought it could be just some metadata work. ffmpeg -i 30fps.mp4 -filter:v fps=60 out.mp4
• 03:23
  ffmpeg Loop the short video so it can match the duration of the a long audio [closed] - andrew cummins Newest 'ffmpeg' Questions - Stack Overflow
  I have a list of mp4 files and mp3 files in a directory. I need the following loop the short mp4 so it can match the duration of the mp3 file export mp4 file with new audio. But we want the mp4 in portrait mode. ffmpeg -stream_loop -1 -i video.mp4 -i audio.mp3 -map 0:v -map 1:a -preset slow -shortest -movflags +faststart output.mp4 I have this code in ffmpeg, but i would need to have output in portrait mode. the code works, but the issue is having the video output in portrait mode without stretching the (...)
• 04:19
  AVFilterGraph cancel initiating - KaisoHHH Newest 'ffmpeg' Questions - Stack Overflow
  I am trying to use AVFilterGraph to filter render AVFrames from AVStream directly, but I'm facing a situation I might need to cancel the initiating since I may change the filter complex string frequently in a short time as the front end will change fast to adjust the filter complex string. And the init may take long because of my filter string includes some customized parts. I also thought about just async create other filter graph if I cannot just cancel the initiating process in avfilter_graph_parse_ptr. But I'm hesitant about memory leak it may cause. Wondering if (...)

15 avril

Newest 'ffmpeg' Questions - Stack Overflow http://stackoverflow.com/questions/tagged/ffmpeg

• 22:15
  scalable looping slideshow ffmpeg command - Martin Newest 'ffmpeg' Questions - Stack Overflow
  I have the below ffmpeg command which takes a 2 hour mp3 file and four image files and combines them to renders a single mkv video file where the 4 images appear in a slideshow where each image is displayed for an equal amount of time. I am using these files: https://file.io/XjYl2DDrLn6b Since the video is 2 hours long ( 7200 seconds ) and there are 4 images, each image gets displayed for 7200/4 = 1800 seconds. The logic for determining how to loop these image files is within the 'filter_complex' part of my ffmpeg command. [0:a]concat=n=1:v=0:a=1[a]; Use the (...) -- https://file.io/XjYl2DDrLn6b
• 19:28
  ffmpeg output with label 'v' does not exist in any defined filtler graph - David Royale Newest 'ffmpeg' Questions - Stack Overflow
  Been trying to make this Python code work but it fails up until rendering the final part: import subprocess import re import os def detect_idle_sections(video_path): command = ['ffmpeg', '-i', video_path, '-vf', 'select=\\'gt(scene,0.1)\\'', '-vsync', 'vfr', '-f', 'null', '-'] output = subprocess.check_output(command, stderr=subprocess.STDOUT).decode('utf-8') idle_sections = [] duration = 0.0 for line in (...)
• 18:07
  FMP4 moof box sequence number ordering - Daniel Newest 'ffmpeg' Questions - Stack Overflow
  I wanted to do a basic fragmented mp4 broadcast program with avformat libs and HTML5 video and MSE. This is a live stream and I use avformat to copy h264 data to mp4 fragments. Here is my basic drawing of clients attaching to the stream: So, with words: C1J: First Client joins: avformat process starts ftyp, moov, moof, mdat boxes will be served to Client1 ftyp and moov atoms are both saved for later reuse C2J: Second Client joins (later in time): avformat process is ongoing (because it is (...) --
• 16:12
  dockerized python application takes a long time to trim a video with ffmpeg - Ukpa Uchechi Newest 'ffmpeg' Questions - Stack Overflow
  The project trims YouTube videos. When I ran the ffmpeg command on the terminal, it didn't take too long to respond. The code below returns the trimmed video to the front end but it takes too long to respond. A 10 mins trim length takes about 5mins to respond. I am missing something, but I can't pinpoint the issue. backend main.py import os from flask import Flask, request, send_file from flask_cors import CORS, cross_origin app = Flask(__name__) cors = CORS(app) current_directory = os.getcwd() folder_name = (...)