php – 我得到错误“使用了弃用的像素格式,确保你使用ffmpeg正确设置了范围”..有人可以查看下面的代码吗？

[swscaler @ 0x7ff8da028c00] deprecated pixel format used,make sure you did set range correctly
Output #0,mjpeg,to 'image.jpg':
Metadata:
major_brand     : mp42
minor_version   : 0
compatible_brands: isommp42
encoder         : Lavf56.36.100
Stream #0:0(und): Video: mjpeg,yuvj420p(pc),320x240 [SAR 4:3 DAR 16:9],q=2-31,200 kb/s,1 fps,1 tbn,1 tbc (default)
Metadata:
  creation_time   : 2016-11-06 09:40:22
  handler_name    : ISO Media file produced by Google Inc.
  encoder         : Lavc56.41.100 mjpeg
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
Press [q] to stop,[?] for help
frame=    1 fps=0.0 q=4.8 Lsize=      16kB time=00:00:01.00 bitrate= 129.5kbits/s    
video:16kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

这也是我的代码：

$video_url ='https://URL/upload/4b8acab123563649f19e07450d810df6.mp4';


 $ffmpeg = '/opt/local/bin/ffmpeg';
 $image = 'image.jpg';
 $interval = 5;
 $size = '320x240';
 shell_exec($tmp = "$ffmpeg -i $video_url -deinterlace -an -ss $interval -f mjpeg -t 1 -r 1 -y -s $size $image 2>&1");