Comments (5)
kescherCode
commented on July 17, 2024
One possibility at the top of my head would be to recognize whether a client has downloaded the last frame it was sent yet, and if not, put the next fully available frame into the stream. This could be a pointer to a chunked frame.
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vvidic
commented on July 17, 2024
On Fri, Nov 13, 2020 at 03:04:13AM -0800, Jeremy Kescher wrote:
One possibility at the top of my head would be to recognize whether a
client has downloaded the last frame yet, and if not, put the next
fully available frame into the stream.
I need to test this, but skipping frames should happen if client send
is blocking:
```
func (pubSub *PubSub) doPublish(data []byte) {
subs := pubSub.subscribers
for s := range subs {
select {
case s.ChunkChannel <- data: // try to send
default: // or skip this frame
}
}
}
```
…--
Valentin
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BigNerd95
commented on July 17, 2024
You can reproduce this by changing "Online" to "Slow 3G" in Chrome Developer Tools > Network.
Then add a print in these places:
https://github.com/vvidic/mjpeg-proxy/blob/master/mjpeg-proxy.go#L412
https://github.com/vvidic/mjpeg-proxy/blob/master/mjpeg-proxy.go#L419
The server block during part.Write (which is correct)
But how you can see by this log, it block after a lot of frame were sent.
chunker[/source3]: started
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds (on part.Write)
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# here stop a few seconds
Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send Send
# ...
Each Send is about 36452 bytes
Note: the first group of Send is much longer than the following ones
- First group: 216 send of 36452 bytes is about 7.5 MB (maybe 8 MB considering boundary and content-length of the frame)
- Following groups: 26 send of 36452 is about 1 MB
So it seems to be filling up an underlying buffer of 8 MB and then block until a 1 MB is free
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BigNerd95
commented on July 17, 2024
I just tried with another computer instead of localhost.
Now it sends only 6 frame and then block.
So maybe there is a buffer only when using localhost?
Anyway, I set 1kb/s on the receiving host, but it would be better if it only sends 1 or max 2 frame.
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vvidic
commented on July 17, 2024
On Fri, Nov 13, 2020 at 06:36:37AM -0800, Lorenzo Santina wrote:
I just tried with another computer instead of localhost.
Now it sends only 6 frame and then block.
So maybe there is a buffer only when using localhost?
Anyway, I set 1kb/s on the receiving host, but it would be better if
it only sends 1 or max 2 frame.
I did some testing and it seems to behave relatively well already. TCP
buffer on a real (not simulated) slow connection should be small and not
too many frames should be sent at once.
…--
Valentin
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Related Issues (12)
- Pubsub writes HTTP 200 status code even if something is wrong with the stream.
- Some DLINK camera fail the content type check
- streams kept open unexpectedly HOT 12
- 401 Unauthorized (digest?) HOT 5
- Boundary changes with every request HOT 17
- Add option to allow -rate to be defined by query string HOT 2
- Panic -> crash on i/o timeout
- No data returned, response 'pending' HOT 1
- Add info endpoint HOT 1
- Is this append needed? HOT 1
- Chunkers not ending when HTTP HEAD requests are made HOT 3
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