视频播放太快
来源：9-10 实战从视频设备上采集数据2
heaven强
2020-12-27
- 我设备采集支持的帧率如下
[0]: ‘YUYV’ (YUYV 4:2:2)
Size: Discrete 640x480
Interval: Discrete 0.033s (30.000 fps)
Interval: Discrete 0.067s (15.000 fps)
Interval: Discrete 0.100s (10.000 fps)
Interval: Discrete 0.200s (5.000 fps)
我代码之中设置的参数如下
nRet = av_dict_set(&lpOptions,“video_size”, “640x480”, 0);
nRet = av_dict_set(&lpOptions,“framerate”, “30”, 0); //无论怎么改都不行
采集到之后播放ffplay -s 640x480 -pix_fmt yuyv422 video3.yuv 速度太快，
4回答
-
李超
2021-01-21
把帧率设置为5帧试试
00 -
At小明同学
2021-01-21
可能的原因是采集到的帧率低于设定的帧率，真实存储的帧率要已实现存储的为准。可以通过打印的方式统计一秒钟可以存储多少帧，摄像头每秒可以出30帧数据，但是只保存了20帧，正常情况我们会把摄像头的数据扔到一个队列中，不会把读数据和写数据放在同一个线程中的！ 看看线程中有没有啥耗时操作
00 -
李超
2021-01-05
把ffplay 的播放帧率设置为15帧试试
032021-01-21 -
heaven强
提问者
2021-01-05
使用的播放命令
ffplay -s 640x480 -pix_fmt yuyv422 -framerate 30 video_test.yuv
以下是录制时候的信息
[video4linux2,v4l2 @ 0x7f6d34000cc0] fd:19 capabilities:84a00001
[video4linux2,v4l2 @ 0x7f6d34000cc0] Current input_channel: 0, input_name: Camera 1, input_std: 0
[video4linux2,v4l2 @ 0x7f6d34000cc0] The V4L2 driver changed the pixel format from 0x32315559 to 0x56595559
[video4linux2,v4l2 @ 0x7f6d34000cc0] Trying to set codec:rawvideo pix_fmt:yuv420p
[video4linux2,v4l2 @ 0x7f6d34000cc0] The V4L2 driver changed the pixel format from 0x32315559 to 0x56595559
[video4linux2,v4l2 @ 0x7f6d34000cc0] Trying to set codec:rawvideo pix_fmt:yuv420p
[video4linux2,v4l2 @ 0x7f6d34000cc0] The V4L2 driver changed the pixel format from 0x32315659 to 0x56595559
[video4linux2,v4l2 @ 0x7f6d34000cc0] Trying to set codec:rawvideo pix_fmt:yuv422p
[video4linux2,v4l2 @ 0x7f6d34000cc0] The V4L2 driver changed the pixel format from 0x50323234 to 0x56595559
[video4linux2,v4l2 @ 0x7f6d34000cc0] Trying to set codec:rawvideo pix_fmt:yuyv422
[video4linux2,v4l2 @ 0x7f6d34000cc0] Setting time per frame to 1/3000
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