FFMPEG对DASH切片的参数说明

FFMPEG DASH支持的参数如下：

1）window_size： number of segments kept in the manifest，默认值：0

2）extra_window_size：number of segments kept outside of the manifest before removing from disk，默认值：5

3）min_seg_duration：minimum segment duration (in microseconds)，默认值：5000000，即5秒

4）remove_at_exit：remove all segments when finished，默认值：0

5）use_template：Use SegmentTemplate instead of SegmentList，默认值：1

6）use_timeline：Use SegmentTemplate instead of SegmentList，默认值：1

7）single_file：Store all segments in one file, accessed using byte ranges，默认值：0

8）single_file_name：DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges，默认值：NULL

9）init_seg_name：DASH-templated name to used for the initialization segment，默认值："init-stream$RepresentationID$.m4s"

10）media_seg_name：DASH-templated name to used for the media segments，默认值："chunk-stream$RepresentationID$-$Number%05d$.m4s"

示例说明：

ffmpeg -i sample.mp4 -c copy -f dash -window_size 0 -min_seg_duration 3000000 -single_file 0 -init_seg_name initavatar-stream\$RepresentationID\$.m4s -media_seg_name chunkavatar-stream\$RepresentationID\$-\$Number%05d\$.m4s -use_template 0 -bsf:a aac_adtstoasc
 manifest.mpd