Video play back is delayed and playing kind of in slow motion

[AmdEagle]

Thank you for the release build. have tried it and i was able to decode the incoming h264 stream.. But there seems to a delay that keep one increasing.. Any idea what i am doing wrong ?

As when it starts the video is of current time then its starts to lag and also the video play is very slow like it is playing in slow motion. Any setting that i have to set before decoding the file ?

[ttyridal]

Hi,

There can be various reasons for this.

The first I'd check is the delay on line 52 in decoder.html. This is way too simple for a generic player, and should probably be adapted to use requestAnimationFrame or something instead. A generic player would also need to read the fps from the stream and adapt here accordingly.

A couple of other possibilities: Your computer is too slow, the complexity of the video is too high, your not keeping the input queue full (slow network?)

[AmdEagle]

The data stream i receive is every 30 milliseconds. When i receive the byteArray i immediately call decoder.postMessage({ type: 'frame', data: frame }); once i get the decoded data i push it to the player.js to play it on the YUVCanvas. Is there any internal Delay inside the decoder.js

[ttyridal]

No, the core decoder goes as fast as possible.

[AmdEagle]

If i am passing in a h264 stream Main profile SD Stream 432p it works fine once i start changing the resolution to 720p and 1080p the video become slow in play back and playing delayed ... So from this i understand that the decoder is not able to decode the 720p as fast as the 432p video.. Any thing that i can do to increase the performance ?

[ttyridal]

Except from buying a new computer, not that I know.

You could try to count the fps (instead of displaying) to see if decoding or displaying is your main problem. But my guess is that it's the decoding..
It may be as simple as: Javascript video decoding has limitations on framerate, bitrate and complexity.

[AmdEagle]

Hi
Is there any way of getting the height and width of the decoded Frame ?

[ttyridal]

They're available among the frame_callback arguments.