tencent cloud

// Convert an .mov video to an .mp4 video
ffmpeg -i input.mov output.mp4

// Change the frame rate of the original video to 24 FPS
ffmpeg -i input.mp4 -r 24 -an output.mp4

// Convert an .mp4 video to a video stream suitable for live streaming
ffmpeg -i input.mp4 -codec: copy -bsf:v h264_mp4toannexb -start_number 0 -hls_time 10 -hls_list_size 0 -f hls output.m3u8

// Change the video resolution to 480x360 and change the bitrate to 400 Kbps
ffmpeg -i input.mp4 -vf scale=480:360,pad=480:360:240:240:black -c:v libx264 -x264-params nal-hrd=cbr:force-cfr=1 -b:v 400000 -bufsize 400000 -minrate 400000 -maxrate 400000 output.mp4

// Add text such as subtitles and title to the video
// `fontfile` is the path of the font to be used, and `text` is the text to be added
// `fontcolor` is the font color, `fontsize` is the font size, and `box` is the text box
// `box=1` indicates to enable the text box, while `0` indicates to disable it. `boxcolor` is the box color. `black@0.5` indicates black with 50% transparency. `boxborderw` is the width between the box and the text
// `x` and `y` indicate the text position. They can be numbers or expressions. For more information, visit the FFmpeg website
ffmpeg -i input.mp4 -vf "drawtext=fontfile=/path/to/font.ttf:text='your text':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2" -codec:a copy output.mp4

// Add an image such as logo, profile photo, and sticker to the video. `filter_complex` indicates a complex filter, `overlay` indicates the X and Y coordinates of the image, and `enable` indicates the image display period (from second 0 to second 20)
ffmpeg -i input.mp4 -i avatar.JPG -filter_complex "[0:v][1:v] overlay=25:25:enable='between(t,0,20)'" -pix_fmt yuv420p -c:a copy output.mp4

// Splices videos. `list.txt` lists the paths of all video files to be spliced in sequence; for example:
// Note: If the videos have different resolutions, splicing will fail.
ffmpeg -f concat -safe 0 -i list.txt -c copy -movflags +faststart output.mp4
// `list.txt` is in the following format:
file 'xx.mp4'
file 'yy.mp4'

// Add audio to the video. `stream_loop` indicates whether to loop the audio (-1: infinite loop; 0: no loop). `shortest` indicates to complete encoding when the shortest .mp3 input stream ends.
ffmpeg -y -i input.mp4 -stream_loop -1 -i audio.mp3 -map 0:v -map 1:a -c:v copy -shortest output.mp4

child = subprocess.run('./ffmpeg -i input.mov output.mp4',
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE, close_fds=True, shell=True)
if child.returncode == 0:
    print("success:", child)
else:
    print("error:", child)
        raise KeyError("Failed to process the video. Error:", child)