video

Support play and record video with avi format

1. Global Function

1.1. open(path, record=False, interval=100000, quality=50, width=320, height=240, audio=False, sample_rate=44100, channels=1)

Open a avi file to play or record

Parameters

  • path: file path, e.g. /sd/badapple.avi
  • record: record video or not, if False just to play video
  • interval: Record interval, unit: micro second, fps = 1000000/interval, default to 100000, that is 10 frames per second
  • qualityjpeg compress quality(%), default to 50
  • width: record screen width, default to 320
  • height: record screen height, default to 240
  • audio: record audio or not, default to False
  • sample_rate: sample rate of recorded audio, default to 44100 (44.1k)
  • channels: channels of recorded audio, default to 1

Return Value

Return a object, just support avi format yet, so just return a instance of avi class

2. Class avi

Get from video.open()

2.1. play()

Play video, decode one frame data(video or audio) every once called

Return value

  • 0: play end
  • 1: playing
  • 2: pause(reverve)
  • 3: current frame is video
  • 4: current frame is audio

2.2. volume(volume)

Set play volume

Parameters

  • volume: value:[0,100]

Return value

Set value, ranges: [0,100]

2.3. record()

Record video frame, it will block until the interval time up

Return Value

The length of current frame( video )

3. Examples

3.1. Example 1: Play avi video

Encode a video with format: screen size 320x240MJEPG compress format, PCM format audio

You can download avi video here: badapple.avi

import video,time
from Maix import GPIO

fm.register(34,  fm.fpioa.I2S0_OUT_D1)
fm.register(35,  fm.fpioa.I2S0_SCLK)
fm.register(33,  fm.fpioa.I2S0_WS)
fm.register(8,  fm.fpioa.GPIO0)
wifi_en=GPIO(GPIO.GPIO0,GPIO.OUT)
wifi_en.value(0)

v = video.open("/sd/badapple.avi")
print(v)
v.volume(50)
while True:
    if v.play() == 0:
        print("play end")
        break
v.__del__()

By default, it will use I2S0 to display audio, so we need to set their corresponding pins;

Turn off WiFi because of the interference of Dock board WiFi on sound quality

3.2. Example 2: Record Video

import video, sensor, image, lcd, time

lcd.init()  
sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.run(1)
sensor.skip_frames(30)
v = video.open("/sd/capture.avi", record=1, interval=200000, quality=50)
i = 0
tim = time.ticks_ms()
while True:
    tim = time.ticks_ms()
    img = sensor.snapshot()
    lcd.display(img)
    img_len = v.record(img)
    # print("record",time.ticks_ms() - tim)
    i += 1
    if i > 100:
        break
print("finish")
v.record_finish()
lcd.clear()

You can cancel the print comment to see if the actual recording interval has reached the set frame interval (such as 200000us set here). The actual print should be 200ms, If the actual frame interval is greater than the set value, the actual performance does not meet the set requirements. You need to increase the set frame interval to decrease the frame rate. In addition, removing the display and printing can also increase the frame rate to some extent.

powered by GitbookFile Modify: 2020-11-25 18:03:47

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