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• Anomalie #2427 (Nouveau) : vignette sur image trop grosse

  24 novembre 2011, par Ben .

  15:02 reprenons 15:03 de ce que tu décris et ce qui arrive de temps en temps : 15:03 un utilisateur poste une GROSSE image, SPIP essaye de générer une vignette de cette image, mais php n’y arrive pas car pas assez de mémoire en général 15:03 ok 15:04 fil> c’st affreux comme situation Benny_b (...)

• How to make circular waveform video with background image using ffmpeg ?

  20 août 2024, par Ansh Rathod

  Hi I want to make a circular waveform video using ffmpeg but want to use the background image. I tried this command many times but didn't work, I tried using ChatGPT over and over but didn't work at all now I'm questioning whether is it even possible to make it in a single command or not.

  


  ffmpeg -i input.mp3 -i background.png -filter_complex "[0:a]showwaves=size=100x100:colors=white:draw=full:mode=p2p[v];[v]format=rgba,geq='p(mod((2*W/(2*PI))*(PI+atan2(0.5*H-Y,X-W/2)),W), H-2*hypot(0.5*H-Y,X-W/2))'[vout];[1:v][vout]overlay=(W-w)/2:(H-h)/2[outv]" -map "[outv]" -map 0:a -pix_fmt yuv420p output.mp4


  


  I used this command without bg it works :

  


  
ffmpeg -i input.mp3 -filter_complex "[0:a]showwaves=size=100x100:colors=white:draw=full:mode=p2p[v]; \[v]format=rgba,geq='p(mod((2*W/(2*PI))*(PI+atan2(0.5*H-Y,X-W/2)),W), H-2*hypot(0.5*H-Y,X-W/2))'[vout]" -map "[vout]" -map 0:a -pix_fmt yuv420p output.mp4



  


• How to dynamically overlay images with ffmpeg

  23 mai, par Rorschy

  As a part of a bigger project, I'm trying to stream a live feed using ffmpeg through RTSP while also dynamically changing subtitles depending on the situation.

  


  As of now, I'm able to live stream with no issue. I also came across a solution for the subtitles by using a text file.

  


  However, I'd like to avoid having this text file in my project. I thought about creating a picture with the subtitles and overlaying it with the screen stream. However, with my current solution, the data is streamed only when I kill the running code (data streamed for a few seconds).

  


  Here is the current code for this problem :

  


  import subprocess
import threading
import string
import random
import time
import io
from PIL import Image, ImageDraw, ImageFont

RTSP_URL = "..."
ffmpeg = None

def generate_subtitle():
    width = 640
    height = 100
    font_size = 32
    while True:
        if ffmpeg:
            try:
                text = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(10))

                image = Image.new("RGBA", (width, height), (0, 0, 0, 128))
                draw = ImageDraw.Draw(image)

                try:
                    font = ImageFont.truetype("arial.ttf", font_size)
                except IOError:
                    font = ImageFont.load_default()

                bbox = draw.textbbox((0, 0), text, font=font)
                text_width = bbox[2] - bbox[0]
                text_height = bbox[3] - bbox[1]

                x = (width - text_width) // 2
                y = (height - text_height) // 2

                draw.text((x, y), text, font=font, fill=(255, 255, 255, 255))
                buffer = io.BytesIO()
                image.save(buffer, format="PNG")
                ffmpeg.stdin.write(buffer.getvalue())
                ffmpeg.stdin.flush()
                time.sleep(5)
            except Exception as e:
                print("Erreur d'envoi d'image :", e)
                break
        else:
            time.sleep(1)

def run_ffmpeg():
    global ffmpeg
    ffmpeg = subprocess.Popen([
        'ffmpeg',

        # Input 0: capture desktop
        "-f", "gdigrab",
        "-offset_x", "0",
        "-offset_y", "0",
        "-video_size", "1920x1080",
        "-i", "desktop",

        # Input 1: PNG overlay from stdin
        "-f", "image2pipe",
        "-vcodec", "png",
        "-i", "-",

        # Filter to overlay Input 1 on Input 0
        "-filter_complex", "[0:v][1:v]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)-10",

        # Output settings
        "-vcodec", "libx264",
        "-preset", "ultrafast",
        "-tune", "zerolatency",
        "-g", "30",
        "-sc_threshold", "0",
        "-f", "rtsp",
        RTSP_URL
    ], stdin=subprocess.PIPE)

threading.Thread(target=run_ffmpeg, daemon=True).start()

threading.Thread(target=generate_subtitle, daemon=True).start()

while True:
    time.sleep(1)



  


  My question is how can I stream the data correctly ?
If there is another solution to change dynamically the subtitles without using a text file or a temporary file I'd be glad to hear it.