问题
I want to download a single frame of a video file from a server from my android application. I do not wat to download the full video at front. Use that frame as a thumbnail to display to the user, so that if choosen by user it can be downloaded.
回答1:
ffmpeg can create a thumbnail from a video stream using this command:
ffmpeg -itsoffset -4 -i http://somevideosite/test.avi -vcodec mjpeg -vframes 1\
-an -f rawvideo -s 320x240 thumb.jpg
To get ffmpeg into android seems doable.
回答2:
It will be easier if your server provided thumbnails for each video like youtube/dailymotion does. You could create this thumbnail when video is added to the server.
Ex: http://img.youtube.com/vi/<VIDEO_ID>/<1,2,3>.jpg
来源：https://stackoverflow.com/questions/11046422/download-first-frame-of-video-android-programmatically