Change segment text before processing

[shorts7wound]

What do you want to do with Hls.js?
so due to some sec reason i want to add some extra text to .ts file in the begining of so when parsing it causes buffering issues
to fix this i decided to removed that 'extra' text i added before processing the segment issue is i dont know how to manipulate arraybuffer so i can remove that text since i am not that knowledgable on js
What have you tried so far?

i tried many things including just download hlsjs file directly then edit readystatechange
  // >= HEADERS_RECEIVED
    if (readyState >= 2) {
....
          if (isArrayBuffer) 
          {
            console.log(xhr.response);
            var ress = xhr.response;
            //console.log(ress.replace('FFmpeg','')); 
            var enc = new TextDecoder('ASCII'); 
            var seg = enc.decode(ress);
            
  //var binaryArray = new Uint8Array(this.response.slice(0)); // use UInt8Array for binary
  //var blob = new Blob([seg], { type: "video/MP2T" }); 
            var enc = new TextEncoder(); // always utf-8 
            var newww = enc.encode(enc.encode(seg)); 
            var ddd = newww.buffer; 
            console.debug( newww );  
            console.debug( newww.buffer);  
            //dec = dec.replace('ÿØÿà �JFIF','') ; 
            //xhr.response = Array.from(newww) ;
            data = ddd;
            len = data.byteLength;

the idea was to convert arraybuffer to string remove that text then convert it back to arraybuffer

[itsjamie]

If you know how much text you added, you could simply slice the front of the buffer.
See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer/slice

However, hls.js actually allows for some extra text at the beginning of your MPEG-TS segments, so if you are within this allowable length, you shouldn't need to do anything.

Packet length is 188 as MPEG-TS packets are 188 bytes each.

Math.min(PACKET_LENGTH * 5, data.length - PACKET_LENGTH * 2) + 1
So, it will look for the "sync" (0x47) byte in MPEG-TS files within either the first 981 bytes of the file, or the size of the MPEG-TS segment - 376 + 1 whichever is smaller.

Unless it's a huge amount of text, you should be covered with the above.

[itsjamie]

I'm moving this to Discussions as it isn't an issue with the hls.js library at first glance.

[shorts7wound]

yeah thanks a lot both not doing anything and also converting to uint then slice worked