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• ffmpeg transcode to hls and multiple aac audio tracks

  23 août 2023, par Aquarius

  I'm trying to transcode h264 mp4 file to HLS format with multiple AAC audio tracks. On Windows browsers everythins works like a shine. There's an option to switch audio track

  


  

  


  It doesn't work on Android devices or TV. On Android Opera browser video works with sound, but screen stuck while seeking and there's no option to switch audio track. On TV browser video works, it doesn't stuck when seeking but also no option to switch audio track

  


  Using video.js player on site. Below code for transcode and produced manifest file

  


  ffmpeg -i "file.mp4" -i PL-6ch.aac -i EN-6ch.aac -map 0:v -map 1:a -map 2:a -c:v copy -c:a:0 aac -ac:a:0 6 -af channelmap=channel_layout=5.1 -c:a:1 aac -ac:a:1 6 -af channelmap=channel_layout=5.1 -tag:v:0 h264 -b:v:0 2500k -tag:a:0 aac -b:a:0 384k -tag:a:1 aac -b:a:1 384k -f hls -hls_time 10 -hls_playlist_type vod -hls_list_size 0 -master_pl_name file.m3u8 -var_stream_map "v:0,agroup:AAC a:0,agroup:AAC,language:pl a:1,agroup:AAC,language:en" file_%v_.m3u8


  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="AAC",NAME="Polish",AUTOSELECT=YES,DEFAULT=YES,LANGUAGE="pl",URI="file_1_.m3u8"
#EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="AAC",NAME="English",AUTOSELECT=YES,DEFAULT=NO,LANGUAGE="en",URI="file_2_.m3u8"
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=3172400,RESOLUTION=1920x872,CODECS="avc1.640029,mp4a.40.2",AUDIO="AAC" 
file_0_.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=422400,CODECS="mp4a.40.2",AUDIO="AAC"
file_1_.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=422400,CODECS="mp4a.40.2",AUDIO="AAC"
file_2_.m3u8


  


  Any clues what's wrong ?

  


• Core : Reset element styles when using custom highlight methods

  2 décembre 2014, par Maks3w

  Core : Reset element styles when using custom highlight methods
  When use a custom highlight functions which for example place the error
  
  class in a different element (like Bootstrap form-group wrapper) this
  
  element are not unhighlighted after resetForm.
  Closes #1323
  

• RTSP/RTMP Video Streaming Client iOS [closed]

  28 mai 2015, par nathansizemore

  I’m in need of a open source solution/library to stream RTSP/RTMP to an iOS Application. I need to build an app that connects to a media server, and opens the provided video stream. I believe there has to be libraries out there, but I have yet to find one that is open source, compiles, actually works, and runs on iOS 5+, iPhone 4+. I do not have a preference, RTMP or RTSP will suffice. Preferably the one with the least amount of work. I have RTSP working on the Android side, but nothing for iOS yet.

  This is what I already know from research today -

  RTSP

  • Seems possible using Live555/FFMPEG
  • MooncatVenture Group - Old FFMPEG, not compatible with ARMv7s (No updates/blogs/commits in over a year)
  • DFURTSPPlayer - This is a working example.

  RTMP

  • Seems possible using Live555/FFMPEG
  • A few libraries are out there for data messaging, but that is all
  • MidnightCoders Project - Does not seem video support is build yet, as Audio is not.

  I’ve never messed with anything video related before, so encoding, frame rate, key frame, chunks, etc... is pretty foreign to me. Right now, it seems building a static binary from Live555/FFMPEG is the only solution to my problem. If so, can anyone give me a simple quickstart guide or links to a blog/example someone has out there ? I’m not looking for anything crazy, just a simple

  1. Download This - LINK
  2. Compile it like this - LINK
  3. Place it into X Folder in Xcode
  4. Create X Object
  5. Read Stream API here - LINK

  If not, anyone want to point me to a working open source library ?

  Oh yeah, this happens to be my first iPhone app and first time in Objective-C. Awesome first project, yeah ?