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• MPEG DASH : Playing video segments from .m4s files instead of byte ranges in the MPD File using Simple DASH Player

  1er novembre 2018, par Trycoder

  I have followed the tutorial from the link below to create an MPEG DASH player using HTML5 and javascript.
  Building a simple MPEG dash player using HTML5 and JS.

  In the given tutorial, it is possible to play the video segments using byte ranges. But for my application, I need the following features.

  1. The video player should read the .m4s segment files and play the video instead of byte ranges.
  2. The amount of data in the MediaSource buffer should be calculated periodically, also the amount of space left in the buffer.

  Are these possible in the given player or Is there a better MPEG DASH Player with the above features ?

  PS : The MPD File is created using FFmpeg.

  ffmpeg  -f  avfoundation -video_size 1280x720 -framerate 30 -i 0 -vcodec libx264  -acodec aac  -b:v 800k  -f dash  -use_template 0  -min_seg_duration 4000 -single_file 1  -start_at_zero -live 1  ffmpeg.mpd

  Also, I tried using the DASH.js player but the documentation is very vast in it. Can we get the size of the source buffer in dash.js (The space available in the source buffer and also the amount of space filled) ? This is the main feature which is required for my project.

  Edit :
  Code which I tried

• my own tv news channel - using vlc streaming

  6 janvier 2015, par SledgehammerPL

  I want to create my own tv channel (using vlc streaming).
  And for now - it works great :

  cvlc --sout-keep --loop --sout '#standard{access=http,mux=ts,dst=:2000}' file.avi

  But i have two problems :

  1st : how to make a playlist, which i can modify without breaking the streaming (I thought about playlist with file1.avi- file10.avi, which all are symlinks, so when i’m sure, that file2 is playing, I can change symlink for file1 -but maybe there is something beter ?
  2ns : I want to add logo, and news ticker - adding logo is quite easy, but ticker looks hard : for now i know, that I have to use transcode sfilter, something like

  cvlc  --sout-keep --loop --sout '#transcode{soverlay, sfilter=marq{marquee="$N$_$T$_$D", position=5, size=14, opacity=255}, vb=600, vcodec=h264, venc=x264{bpyramid=none, weightp=0}}:standard{access=http,mux=ts,dst=:2000}' film.mp4

  but the problem is that ticker doesn’t move - it changes, but not move

  And I think if I can add logo twice - with ticker between logos - i think about layers :
  1. movie
  2. ticker background
  3. ticker text
  4. ticker frame (because i don’t want to scroll text from border to border)

  Any ideas ?

• Audio Slowly Desynchronizing When Segmenting

  14 avril 2018, par Nimble

  I use ffmpeg’s ability to segment video while I record so I can record constantly without my hard drive filling up.

  It works really well, expect the audio desynchronizes from the video when the file segments. The video seems to be uninterrupted but I can actually hear a tiny jump in the audio when I join segments later on. One would think that ffmpeg would store packets in a queue during segmentation so nothing is lost but that doesn’t seem to be the case... Any way I could force it to do something like that ?

  Here is my current block :

  ffmpeg -y -thread_queue_size 5096 -f dshow -video_size 3440x1440 -rtbufsize 2147.48M -framerate 100 -pixel_format nv12 ^
  
  -itsoffset 00:00:00.012 -i video="Video (00 Pro Capture HDMI 4K+)" -thread_queue_size 5096 -guess_layout_max 0 -f dshow ^
  
  -rtbufsize 2147.48M -i audio="SPDIF/ADAT (1+2) (RME Fireface UC)" -map 0:0,1:0 -map 1:0 -c:v h264_nvenc -preset: llhp ^
  
  -pix_fmt nv12 -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M -b:a 384k -ac 2 -r 100 -vsync 1 ^
  
  -max_muxing_queue_size 5096 -segment_time 600 -segment_wrap 9 -f segment C:\Users\djcim\Videos\PC\PC\PC%02d.mp4 

  I am delaying the video stream because right out the gate it’s a little bit ahead of the audio.

  PS : aresample or async seem to have no effect or at least not a desirable one.