WebRTC: playing before publishing

[w41203208]

player before publisher in webrtc

Why happen problem when I playing before publishing on Unity platform, but on the website platform don't hanppen

1. SRS Version: I use development branch

Problem

1. if streamUrl haven't be used, situation of player before publisher won't show screen at player but I am sure that pkt has passed to player consumer
2. if streamUrl have be used above situation will not happen and successfully show screen on player
3. Unity platform will happne this problem but website no.

[DannisMa]

I have same issue,too.

[w41203208]

I have fixed this problem. Thank you!

[winlinvip]

How did you fix it? Could you share the details?

TRANS_BY_GPT4

[w41203208]

I find that pkt pt no change to player track pt to in SrsRtcVideoSendTrack and SrsRtcAudioSendTrack on_rtp function, if player before publisher is happened.

Because below condition is no match, I do checking SrsSource and change player track media pt_of_publisher to be SrsSource pulisher's track media pt which is same ssrc with player track. Ensure below condition has excuted.

// Should update PT, because subscriber may use different PT to publisher.
    if (track_desc_->media_ && pkt->header.get_payload_type() == track_desc_->media_->pt_of_publisher_) {
        // If PT is media from publisher, change to PT of media for subscriber.
        pkt->header.set_payload_type(track_desc_->media_->pt_);
    } else if (track_desc_->red_ && pkt->header.get_payload_type() == track_desc_->red_->pt_of_publisher_) {
        // If PT is RED from publisher, change to PT of RED for subscriber.
        pkt->header.set_payload_type(track_desc_->red_->pt_);
    } else {
        // TODO: FIXME: Should update PT for RTX.
    }

This is my temporary solution. And it can work.

[SZ937GroupMaster]

Has this issue been resolved?

[winlinvip]

Should have been fixed.