Progressive mode is broken with fmp4 playback #4317
Description
What version of Hls.js are you using?
1.0.10
What browser (including version) are you using?
Chrome 93.0.4577.63 (Official Build) (x86_64)
What OS (including version) are you using?
MacOS 11.3
Test stream
Configuration
{
"debug": true,
"enableWorker": true,
"backBufferLength": 90,
"progressive": true
}Additional player setup steps
No response
Checklist
- The issue observed is not already reported by searching on Github under https://github.com/video-dev/hls.js/issues
- The issue occurs in the stable client (latest release) on https://hls-js.netlify.com/demo and not just on my page
- The issue occurs in the latest client (main branch) on https://hls-js-dev.netlify.com/demo and not just on my page
- The stream has correct Access-Control-Allow-Origin headers (CORS)
- There are no network errors such as 404s in the browser console when trying to play the stream
Steps to reproduce
- choose any fmp4 playback in the demo page
- enable progressive mode
Expected behaviour
the video should play correctly
What actually happened?
video stuck at loading, and warning can be found in the console
So basically what I found is in base-stream-controller, no onprogress callback is provided when trying to load initSegement, while the fetch-loader, in this case, will resolve the load promise with empty data and calling onsuccess.
In our own forked version, what I did is forcing fetch-loader to go through the 'full' load path when fragment sn is initSegment, by setting highwatermark to Infinity or by removing onprogress callback. And this seems fixed the issue.
I don't think this is a proper fix, but I think I need some knowledge to fully understand the issue. would there be any risk when trying to progressively load initSegement?
Console output
f17655d0-f3f7-4596-9862-c9c69543b6a8:2479 [warn] > [passthrough-remuxer.ts]: initSegment does not contain moov or trak boxes.
generateInitSegment @ f17655d0-f3f7-4596-9862-c9c69543b6a8:2479
remux @ f17655d0-f3f7-4596-9862-c9c69543b6a8:2517
flushRemux @ f17655d0-f3f7-4596-9862-c9c69543b6a8:938
flush @ f17655d0-f3f7-4596-9862-c9c69543b6a8:925
(anonymous) @ f17655d0-f3f7-4596-9862-c9c69543b6a8:139
f17655d0-f3f7-4596-9862-c9c69543b6a8:2523 [warn] > [passthrough-remuxer.ts]: Failed to generate initSegment.Chrome media internals output
No response