切片疑惑
如何指定前几个为5秒，后面都是30秒Muxer hls :
Common extensions: m3u8.
Default video codec: h264.
Default audio codec: aac.
Default subtitle codec: webvtt.
hls muxer AVOptions:
-start_number <int64> E........ set first number in the sequence (from 0 to I64_MAX) (default 0)
-hls_time <float> E........ set segment length in seconds (from 0 to FLT_MAX) (default 2)
-hls_init_time <float> E........ set segment length in seconds at init list (from 0 to FLT_MAX) (default 0)
-hls_list_size <int> E........ set maximum number of playlist entries (from 0 to INT_MAX) (default 5)
-hls_delete_threshold <int> E........ set number of unreferenced segments to keep before deleting (from 1 to INT_MAX) (default 1)
-hls_ts_options <string> E........ set hls mpegts list of options for the container format used for hls
-hls_vtt_options <string> E........ set hls vtt list of options for the container format used for hls
-hls_wrap <int> E........ set number after which the index wraps (will be deprecated) (from 0 to INT_MAX) (default 0)
-hls_allow_cache <int> E........ explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments (from INT_MIN to INT_MAX) (default -1)
-hls_base_url <string> E........ url to prepend to each playlist entry
-hls_segment_filename <string> E........ filename template for segment files
-hls_segment_size<int> E........ maximum size per segment file, (in bytes) (from 0 to INT_MAX) (default 0)
-hls_key_info_file <string> E........ file with key URI and key file path
-hls_enc <boolean> E........ enable AES128 encryption support (default false)
-hls_enc_key <string> E........ hex-coded 16 byte key to encrypt the segments
-hls_enc_key_url <string> E........ url to access the key to decrypt the segments
-hls_enc_iv <string> E........ hex-coded 16 byte initialization vector
-hls_subtitle_path <string> E........ set path of hls subtitles
-hls_segment_type<int> E........ set hls segment files type (from 0 to 1) (default mpegts)
mpegts E........ make segment file to mpegts files in m3u8
fmp4 E........ make segment file to fragment mp4 files in m3u8
-hls_fmp4_init_filename <string> E........ set fragment mp4 file init filename (default "init.mp4")
-hls_flags <flags> E........ set flags affecting HLS playlist and media file generation (default 0)
single_file E........ generate a single media file indexed with byte ranges
temp_file E........ write segment and playlist to temporary file and rename when complete
delete_segments E........ delete segment files that are no longer part of the playlist
round_durations E........ round durations in m3u8 to whole numbers
discont_start E........ start the playlist with a discontinuity tag
omit_endlist E........ Do not append an endlist when ending stream
split_by_time E........ split the hls segment by time which user set by hls_time
append_list E........ append the new segments into old hls segment list
program_date_time E........ add EXT-X-PROGRAM-DATE-TIME
second_level_segment_index E........ include segment index in segment filenames when use_localtime
second_level_segment_duration E........ include segment duration in segment filenames when use_localtime
second_level_segment_size E........ include segment size in segment filenames when use_localtime
periodic_rekey E........ reload keyinfo file periodically for re-keying
independent_segments E........ add EXT-X-INDEPENDENT-SEGMENTS, whenever applicable
iframes_only E........ add EXT-X-I-FRAMES-ONLY, whenever applicable
-use_localtime <boolean> E........ set filename expansion with strftime at segment creation(will be deprecated ) (default false)
-strftime <boolean> E........ set filename expansion with strftime at segment creation (default false)
-use_localtime_mkdir <boolean> E........ create last directory component in strftime-generated filename(will be deprecated) (default false)
-strftime_mkdir <boolean> E........ create last directory component in strftime-generated filename (default false)
-hls_playlist_type <int> E........ set the HLS playlist type (from 0 to 2) (default 0)
event E........ EVENT playlist
vod E........ VOD playlist
-method <string> E........ set the HTTP method(default: PUT)
-hls_start_number_source <int> E........ set source of first number in sequence (from 0 to 2) (default generic)
generic E........ start_number value (default)
epoch E........ seconds since epoch
datetime E........ current datetime as YYYYMMDDhhmmss
-http_user_agent <string> E........ override User-Agent field in HTTP header
-var_stream_map <string> E........ Variant stream map string
-cc_stream_map <string> E........ Closed captions stream map string
-master_pl_name <string> E........ Create HLS master playlist with this name
-master_pl_publish_rate <int> E........ Publish master play list every after this many segment intervals (from 0 to UINT32_MAX) (default 0)
-http_persistent <boolean> E........ Use persistent HTTP connections (default false)
-timeout <duration> E........ set timeout for socket I/O operations (default -0.000001)
-ignore_io_errors<boolean> E........ Ignore IO errors for stable long-duration runs with network output (default false)
-headers <string> E........ set custom HTTP headers, can override built in default headers
用-hls_init_time可以设置前几片5秒，hls_time后面30秒， 但是这个只适合直播，不适合点播，点播的话，需要您自己改，目前不支持这么干
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