rtspsrc ERROR: from element /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0: Could not read from resource

[Diego Buffa]

On Thu Oct 20 09:04:43 UTC 2016 Sebastian Dröge wrote:

>The initial RTSP requests/responses (DESCRIBE, SETUP, PLAY) are missing
>though. That's what would've been interesting.

>It seems like rtspsrc is failing on those already

Thanks for your reply Sebastian, the pcap file is pretty huge, as the pipeline worked for a while, so I saved just the last packets.

Here attached the initial RTSP request/response and all the RTSP request/responeses.

d.

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[Sebastian Dröge-3]

On Thu, 2016-10-20 at 14:28 +0200, Diego Buffa wrote:

> On Thu Oct 20 09:04:43 UTC 2016 Sebastian Dröge wrote:
> >The initial RTSP requests/responses (DESCRIBE, SETUP, PLAY) are
> missing
> >though. That's what would've been interesting.
>
> >It seems like rtspsrc is failing on those already
>
> Thanks for your reply Sebastian, the pcap file is pretty huge, as the
> pipeline worked for a while, so I saved just the last packets.
> Here attached the initial RTSP request/response and all the RTSP
> request/responeses.

So it was running for a while? That would indeed mean that the problem
is with the last packets you provided.

The next step would then be to dive into the code and check why it
considers the packet as invalid, what is confusing it. And if the
packet is indeed broken in one way or another.

Can you provide again that the last packet that it successfully parses
and the one where it fails? Which might not be the last one from your
pcap capture, but an earlier one.

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[Diego Buffa]

On Mon, Oct 24, 2016 at 9:05 AM, Sebastian Dröge <[hidden email]> wrote:

So it was running for a while? That would indeed mean that the problem
is with the last packets you provided.

The next step would then be to dive into the code and check why it
considers the packet as invalid, what is confusing it. And if the
packet is indeed broken in one way or another.

Can you provide again that the last packet that it successfully parses
and the one where it fails? Which might not be the last one from your
pcap capture, but an earlier one.

Yes Sebastian, it run for a while.
I guess the last good packet was the one of 1055 received at 1:53:05.895046809

1:53:05.893728142   414   0x77c230 DEBUG                rtspsrc
gstrtspsrc.c:4431:gst_rtspsrc_handle_data:<rtspsrc0> pushing data of size
1446 on channel 0
1:53:05.894069476   414   0x77c230 DEBUG                rtspsrc
gstrtspsrc.c:4561:gst_rtspsrc_loop_interleaved:<rtspsrc0> doing receive
with timeout 114 seconds, 991176 usec
1:53:05.894463809   414   0x77c230 DEBUG                rtspsrc
gstrtspsrc.c:4571:gst_rtspsrc_loop_interleaved:<rtspsrc0> we received a
server message
1:53:05.894605809   414   0x77c230 DEBUG                rtspsrc
gstrtspsrc.c:4607:gst_rtspsrc_loop_interleaved:<rtspsrc0> got data message
1:53:05.894743809   414   0x77c230 DEBUG                rtspsrc
gstrtspsrc.c:4431:gst_rtspsrc_handle_data:<rtspsrc0> pushing data of size
1055 on channel 0
1:53:05.895046809   414   0x77c230 DEBUG                rtspsrc
gstrtspsrc.c:4561:gst_rtspsrc_loop_interleaved:<rtspsrc0> doing receive
with timeout 114 seconds, 990192 usec
1:53:06.151676476   414   0x77c230 WARN                 rtspsrc
gstrtspsrc.c:4641:gst_rtspsrc_loop_interleaved:<rtspsrc0> error: Could not
receive message. (Parse error)
ERROR: from element /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0: Could not
read from resource.

Anyway I cannot find a packet of size 1055 in my pcap file while I see the previous ones of 1446 (end of pcap file attached).

Is there better way to identify the last good packet and  the bad one than looking at the size?

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[Diego Buffa]

On Mon, Oct 24, 2016 at 12:29 PM, Diego Buffa <[hidden email]> wrote:

>
>
> Yes Sebastian, it run for a while.
> I guess the last good packet was the one of 1055 received at 1:53:05.895046809
>
> 1:53:05.893728142   414   0x77c230 DEBUG                rtspsrc
> gstrtspsrc.c:4431:gst_rtspsrc_handle_data:<rtspsrc0> pushing data of size
> 1446 on channel 0
> 1:53:05.894069476   414   0x77c230 DEBUG                rtspsrc
> gstrtspsrc.c:4561:gst_rtspsrc_loop_interleaved:<rtspsrc0> doing receive
> with timeout 114 seconds, 991176 usec
> 1:53:05.894463809   414   0x77c230 DEBUG                rtspsrc
> gstrtspsrc.c:4571:gst_rtspsrc_loop_interleaved:<rtspsrc0> we received a
> server message
> 1:53:05.894605809   414   0x77c230 DEBUG                rtspsrc
> gstrtspsrc.c:4607:gst_rtspsrc_loop_interleaved:<rtspsrc0> got data message
> 1:53:05.894743809   414   0x77c230 DEBUG                rtspsrc
> gstrtspsrc.c:4431:gst_rtspsrc_handle_data:<rtspsrc0> pushing data of size
> 1055 on channel 0
> 1:53:05.895046809   414   0x77c230 DEBUG                rtspsrc
> gstrtspsrc.c:4561:gst_rtspsrc_loop_interleaved:<rtspsrc0> doing receive
> with timeout 114 seconds, 990192 usec
> 1:53:06.151676476   414   0x77c230 WARN                 rtspsrc
> gstrtspsrc.c:4641:gst_rtspsrc_loop_interleaved:<rtspsrc0> error: Could not
> receive message. (Parse error)
> ERROR: from element /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0: Could not
> read from resource.
>
> Anyway I cannot find a packet of size 1055 in my pcap file while I see the previous ones of 1446 (end of pcap file attached).
> Is there better way to identify the last good packet and  the bad one than looking at the size?
>
>

I tried to debug rtspsrc and I inserted a break point at the end of gst_rtsp_connection_receive (cleanup) here is what I get from gdb:
(gdb) p res
$1 = GST_RTSP_EPARSE
(gdb) p timeout
$2 = (GTimeVal *) 0x80d623c
(gdb) p *timeout
$3 = {tv_sec = 20, tv_usec = 0}
(gdb) p message->type
$4 = GST_RTSP_MESSAGE_REQUEST
(gdb) p *conn
$5 = {url = 0xb6d00cb0, fd0 = {fd = 10, idx = 1}, fd1 = {fd = -1, idx = 0}, readfd = 0xb6d01304, writefd = 0xb6d01304, manual_http = 0, tunnelid = '\000' <repeats 23 times>, tunneled = 0,
  tstate = TUNNEL_STATE_NONE, fdset = 0xb6d01808, ip = 0xb6d01640 "192.168.214.117", read_ahead = 0, initial_buffer = 0x0, initial_buffer_offset = 0, cseq = 16,
  session_id = "123012", '\000' <repeats 505 times>, timeout = 120, timer = 0xb6d01598, auth_method = GST_RTSP_AUTH_DIGEST, username = 0xb6d03490 "******", passwd = 0xb6d034a0 "******",
  auth_params = 0x80d9088, ctx = {state = 0, save = 0, out = "\000\000", cout = 0, coutl = 0}, ctxp = 0x0, proxy_host = 0x0, proxy_port = 0}
(gdb) p *message
$7 = {type = GST_RTSP_MESSAGE_REQUEST, type_data = {request = {method = GST_RTSP_INVALID, uri = 0xb6d1c608 "q\262\265\277@\020\064\026!I", version = GST_RTSP_VERSION_1_0}, response = {
      code = GST_RTSP_STS_INVALID, reason = 0xb6d1c608 "q\262\265\277@\020\064\026!I", version = GST_RTSP_VERSION_1_0}, data = {channel = 0 '\000'}}, hdr_fields = 0xb6d1cd80, body = 0x0, body_size = 0}

I see  "reason" in the message structure, could someone tell me what it means, and more in general has someone any clues of why I got this "Could not receive message. (Parse error)?"

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[Sebastian Dröge-3]

On Tue, 2016-10-25 at 12:12 +0200, Diego Buffa wrote:
>
> I see  "reason" in the message structure, could someone tell me what
> it means, and more in general has someone any clues of why I got this
> "Could not receive message. (Parse error)?"

That looks like invalid data. Bigger question is where exactly in the
parsing code it starts failing, and what the data at that point is.

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