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🌱 來自: command line know how

ffmpeg

To create a video from your audio.mp3 file and img.png image, and to add a running time code in the center of the image, you can use FFmpeg, a powerful multimedia framework. Here’s a step-by-step guide on how to do it:

1. Install FFmpeg: If you haven’t already, install FFmpeg on your computer. You can download it from the FFmpeg website and follow the installation instructions for your operating system.

2. Prepare the Command: Use the following FFmpeg command as a template. This command will take your img.png and audio.mp3, create a video, and add a timecode overlay:

ffmpeg -loop 1 -framerate 25 -i img.png -i audio.mp3 -vf "drawtext=text='%{pts\:hms}': x=(w-tw)/2: y=(h/2-th/2): fontcolor=white: fontsize=30: box=1: boxcolor=black@0.5: boxborderw=5" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest output.mp4

Explanation of the command

• -loop 1 -framerate 25 -i img.png: Loops the image at a frame rate of 25 FPS.
• -i audio.mp3: Specifies the audio file.
• -vf "drawtext=...": This is the filter to draw the timecode.
  • text='%{pts\:hms}': The timecode format (hours:minutes:seconds).
  • x=(w-tw)/2: Centers the text horizontally.
  • y=(h/2-th/2): Centers the text vertically.
  • fontcolor=white: Sets the font color to white.
  • fontsize=30: Sets the font size.
  • box=1: Adds a background box for readability.
  • boxcolor=black@0.5: The box color (semi-transparent black).
  • boxborderw=5: The border width of the box.
• -c:v libx264: Uses the H.264 codec for the video.
• -tune stillimage: Optimizes for still image input.
• -c:a aac -b:a 192k: Uses AAC codec for audio with a bitrate of 192k.
• -pix_fmt yuv420p: Ensures compatibility with most players.
• -shortest: Ends the video when the shortest input (audio or video) ends.
• output.mp4: The name of the output file.

3. Run the Command: Open a terminal or command prompt, navigate to the directory where your img.png and audio.mp3 files are located, and run the command.

This command will produce a video file named output.mp4 with your image, the audio playing in the background, and a running time code centered on the image. Adjust the font size and box properties as needed to fit your preferences.

Other overlay

#! /bin/sh
dur=45
ffmpeg -y -filter_complex "
color=green:size=1280x32,loop=loop=-1:size=2,setsar=1[pbbg];
color=white:size=1280x32,loop=loop=-1:size=2,setsar=1[pbfg];
[pbbg][pbfg]overlay='x=t/${dur}*w'[pb];
 
color=black:size=1920x1080,loop=loop=-1:size=2,setsar=1[bg];
[bg][pb]
overlay='x=(W-w)/2:y=700'
,drawtext='fontsize=50:fontcolor=white:text=%{pts\:hms} / 00\:00\:${dur}.000':x=600:y=750
[v]
" -map '[v]' -an -shortest -t ${dur}.1 01-out.mp4