使用 dash 和 ffmpeg 对实时流媒体 webm 进行帧率处理

Question

我正在使用 ffmpeg 和 dash.js 流式传输实时视频 these instructions. 效果很好，只是视频播放的帧率太高。清单中未指定帧速率。 创建块：

SET VP9_LIVE_PARAMS=-speed 6 -threads 8 -static-thresh 0 -max-intra-rate 300 -deadline realtime -lag-in-frames 0 -error-resilient 1
ffmpeg -re -r 25 -i tcp://localhost:8891 ^
-map 0:0 ^
  -pix_fmt yuv420p ^
  -c:v libvpx-vp9 ^
    -s 800x600 -keyint_min 25 -g 25 %VP9_LIVE_PARAMS% ^
    -f webm_chunk ^
    -header "webm_live/glass_360.hdr" ^
    -chunk_start_index 1 ^
  webm_live\glass_360_%%d.chk ^

创建清单：

ffmpeg ^
  -f webm_dash_manifest -live 1 ^
   -r 25 ^
  -i webm_live/glass_360.hdr ^
  -c copy ^
  -map 0 ^
  -r 25 ^
  -framerate 25 ^
  -f webm_dash_manifest -live 1 ^
    -adaptation_sets "id=0,streams=0" ^
    -chunk_start_index 1 ^
    -chunk_duration_ms 1000 ^
    -time_shift_buffer_depth 7200 ^
    -minimum_update_period 7200 ^
  webm_live/glass_live_manifest.mpd

清单：

<?xml version="1.0" encoding="UTF-8"?>
<MPD
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns="urn:mpeg:DASH:schema:MPD:2011"
  xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011"
  type="dynamic"
  minBufferTime="PT1S"
  profiles="urn:mpeg:dash:profile:isoff-live:2011"
  availabilityStartTime="2016-03-30T13:02:53Z"
  timeShiftBufferDepth="PT7200S"
  minimumUpdatePeriod="PT7200S">
<Period id="0" start="PT0S" >
<AdaptationSet id="0" mimeType="video/webm" codecs="vp9" bitstreamSwitching="true" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
<ContentComponent id="1" type="video"/>
<SegmentTemplate timescale="1000" duration="1000" media="glass_$RepresentationID$_$Number$.chk" startNumber="1" initialization="glass_$RepresentationID$.hdr"/>
<Representation id="360" bandwidth="1000000" width="800" height="600" codecs="vp9" mimeType="video/webm" startsWithSAP="1"></Representation>
</AdaptationSet>
</Period>
</MPD>

任何想法如何解决这个问题？

Answer 1

根据this link你应该写

-use_wallclock_as_timestamps 1

用于输入流。