VIMEO share has inexplicable "black holes" (missing video)

Anyone else have this problem:
I just finished a simple project. The project had no abnormal video (no funky formats, I've used this type of footage before, and it was all optimized) and there were no hitches during editing or playback. (And it's not a large project--just under 2 mins.)
Then, I shared a project (to my desktop) following some Vimeo specs that I created.
Just before posting to Vimeo, I did a quality check and layed back the compressed file and... a (:04) black hole randomly appeared at one point in the piece. One entire shot. I went back to the video in the timeline and isolated it. Nothing seemed strange as I played it, nor in the inspector. (And it was not unlike ANY other shot in the timeline, same codec, etc...
I shared the project again. (Again to my Vimeo specs.)
THIS TIME... the original "hole" was gone, but another appeared toward the end of the piece. Again, I went back to my timeline to look at the missing shot... and, once again, it was fine.
I shared the project a THIRD time via my "Vimeo specs," and... that SECOND hole had healed itself, but a black hole appeard in the original location of my first attempt at sharing.
Agh!
So, I just did a full-rez (Master file-defalut) share of the project... and IT'S FINE! No holes. So, I completed a two-stage proces to compress THAT file for Vimeo. And all is well.
So, it seems, the hitches (black holes) appear when I go to share straight from my timeline to a compressed file.
Has anyone else had this phenonmenon?
Has anyone found an answer?

how about if you just export to quicktime movie locally? Do you see the black frame then? You can also export to quicktime and select h264 as the output format, then you should be able to upload that file to vimeo. Extra step but the share to vimeo might be buggy.
Another thing to try is to delete all your render files (both event and project). Let things re-render and try the share to vimeo again.

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Native VLAN and the "Black Hole"

While reviewing the configuration of a network that I'm supporting, it seems that the original design of the network has the black hole VLAN as the native VLAN. At the least this seems incorrect, and possibly very dangerous, but I'm not exactly sure why or how to articulate that. Can someone confirm or deny this suspicion?
In addition, I had two further questions regarding the practice of using a black hole VLAN:
1. If you have any unused ports, it seems more practical to just admin down these ports instead of creating an unused VLAN. Is there some added advantage to ALSO putting these ports in an unused VLAN (e.g. 999)? If the port was needed, you can simply admin up the port, during which time you could also change any needed VLAN configurations. In other words, you'd have to log into the device and make changes whether you went with the admin down method, the Black Hole VLAN method, or both. So what's the point?
2. Assuming you do use the Black Hole VLAN as an added security method, I feel that including that VLAN in the "switchport trunk allowed vlan" command is counterproductive, but I'm not fully able to articulate why. Can someone help me with this?
Thanks for any information or suggestions that you may have.

Assuming you mean a vlan for unused ports when you refer to a black hole vlan. If so the key things are -
a) that vlan does not have a L3 vlan interface (SVI) for it as there is no need to route it
b) any unused ports are shutdown
if you follow the above then I can't see the danger in using the native vlan but I wouldn't do it regardless of that. I would have a dedicated native vlan and a separate vlan for unused ports.
To my mind there should be no ports allocated to the native vlan (other than trunk ports obviously).
The benefit of using a dedicated vlan for unused ports is -
a) it provides an additional level of security. People make mistakes and having to do multiple things to enable a port requires more attention than simply doing a "no shut" on the interface.
The more attention someone is paying the more likely they will get it right or at least the less likely they will make a mistake.
b) if you don't use an unused vlan you are leaving all the ports in the default vlan which is vlan 1 and this should be avoided as this vlan is overused already eg. switch control plane traffic is sent on this vlan for example and often the switch management interfaces are in this vlan.
As far as allowing the unused vlan on trunk links it is totally unnecessary and in fact you really don't want to do that. The idea of the unused vlan is for non communication so it would make no sense to allow it on trunk links.
In my last place of work we used vlan 998 as the unused vlan and vlan 999 as the native vlan.
Neither had an SVI for it.
If by black hole vlan you meant something else then please clarify.
Jon

PMTU-D Black Hole Detection Missing? Cause of some conn hangs.

In looking through the kernel source, it appears that Apple has left out one of the most important parts of Path MTU Discovery (RFC1191) as suggested in RFC2923. Since Path MTU Discovery is enabled by default, this may cause some of you to have 15 minute hangs and ultimate termination of connections when large packets are sent to specific hosts.
Other than DNS and Wireless network drops, MTU settings appear to be one of the single most problematic things going on with OS X right now.
For those who are not familiar with MTU, here's a brief rundown.
10/100 Ethernet networks support a base MTU of around 1514 bytes. This is the max number of bytes that a packet is able to be in order to get put on an Ethernet network (and be within spec). Gigabit Ethernet allows for larger, but we won't go into that.
You're probably more used to hearing 1500, however, that is the MTU for IP (or the Ethernet payload) as the Ethernet header itself is 14 bytes.
In that 1500 bytes, you have to fit your IP header, ICMP/TCP/UDP header, and any higher layer protocols and data, each layering on top of the next.
|<--Ethernet (14 Bytes)--><--IP (20 Bytes)--><--TCP (20 Bytes)--><--Data (1460 Bytes)-->|
So that is how things look on a local area network.
Once the WAN comes into play, the Ethernet header is stripped off leaving only the IP packet and another header put in its place to get it over the next link. This process goes on and on and on until the packet finally reaches its destination.
But here's the problem - what if there is ANOTHER layer between the Ethernet and IP stack?
This is actually quite common and you're probably using it now. The protocol PPP over Ethernet (PPPoE) fits between the Ethernet header and the IP header and adds another 8 bytes to this packet size.
So now we end up with:
|<--Ethernet (14 Bytes)--><--PPPoE (8 Bytes)--><--IP (20 Bytes)--><--TCP (20 Bytes)--><--Data (1452 Bytes)-->|
Notice that we now can't put as much data in this packet or we'll end up with a packet that is too big to fit on the Ethernet network.
The PPPoE header will ultimately get taken off once the packet gets where it needs to go at your ISP, but there may be other 'tunnels' between you and your ultimate destination and continue to strip off space of how much data you can put into a packet.
So how do you know how much data you can put into a packet when you don't own or know anything about the network between you and the destination?
That's where Path MTU Discovery comes into play.
It used to be that IP packets would be fragmented (split up) if a packet was too big to get put on the next network. This process of fragmentation causes overhead for both the router having to split up the packets and the receiving device that has to put them all back together again (and make sure they go in the right order).
So in order to reduce this overhead and also ensure that you are always sending the largest packets possible from end to end, IP stacks started setting the 'Don't Fragment' bit in the IP header. This instructs routers to throw away the packet if it is too big when it gets there.
When the packet gets thrown away due to it being too large, the router that throws it away also sends an ICMP packet (an IP diagnostics message) back to the sender telling it what the MTU is of the interface that couldn't take the packet. The sender can then re-calculate things based on that value and resend.
This works great EXCEPT when there are firewalls in the way (or broken routers, which is less likely these days). Many firewalls will not allow these ICMP messages to go back to the sender. Therefore, your host never receives the message that it is supposed to reduce the size of the packet and keeps trying and trying for about 15 minutes until it finally dies.
This is one reason why you may be seeing long hangs that ultimately end in termination of your connection.
RFC2923 goes into some options to work past this issue.
One way that this can be done, Windows Vista for instance does this, is for the system to keep an eye on how many max sized packets get retransmitted. After a certain number (lets say 5), the system assumes that it is not getting this ICMP notification and cuts the size of that packet in half so it can now get the data through - assuming that smaller packets are better than no packets getting sent.
It may also (and does with Vista) temporarily disable the setting of the 'Don't Fragment' bit and allow the routers to just take care of things. So in Vista, you'll see the page stutter for a second, and then continue to load, where an OS X system will sit there and hang for 15 minutes.
This is where OS X goes wrong. This behavior is called PMTU-D Black Hole Detection and does not appear to be in the IP stack for Leopard (and probably not previous releases).
So what can you do.
You have a few options, some of which I've already provided to a few folks (although without the mathematics so it's just a rough guess value).
First, you can just disable PMTU-D. The command to do this is:
sudo sysctl -w net.inet.tcp.pathmtudiscovery=0
This is a 'quick fix' but does eliminate the benefits that PMTU-D provides.
Second, you can calculate out what size MTU seems to work for you by working backwards and configure that on something within your control.
If your home router supports it, that's a good place to reduce the MTU since it only comes into play when you're using your Internet connection and not when hosts within the same network talk to each other. So if you place the MTU of 1472 on your router and your host sends it a 1500 byte packet, it will send back the ICMP message telling you to reduce it down to 1472.
If your router doesn't support it, you can reduce the MTU on your macs physical interface. This isn't always the best solution since you really should then reduce the MTU on each of your local systems or you could run into issues locally.
The command to do this is:
sudo ifconfig en1 mtu 1472
To make this permanent for Ethernet, set it in the Network settings. For Airport, search the forums. I provided an update you can make to one of the preferences files manually to do this (don't remember what file right now).
I have found a couple of sites (Washington Mutual's website for instance) that appear to have configuration issues internal to their network in which a device behind a firewall (possibly the web server, load balancer, or IPSec added) that may have an MTU less than 1500 set on it AND a firewall blocking ICMP packets from coming back. These sites will throw off your math since you can no longer assume a max size of 1500 for IP packets. In this specific case, you have to assume 1480.
Third, you can adjust the MSS setting (Max Segment Size) in the kernel to a value that is 20 bytes smaller than what you would otherwise set the MTU to. This ensures that the TCP stack doesn't put more than that amount of data in any single packet (therefore, eliminating the MTU issue), however, this will not work for UDP.
Finally, you can submit a bug report to let Apple know that PMTU-D Black Hole detection is something that we need.
So what kind of impact does this have on performance?
This will depend on what solution you choose, what the performance of your home router is, and the load on the various servers that have to potentially re-assemble the packets.
That said, knocking things all the way down to 1400 bytes, I am able to still get at least 15 Mbps up and down stream over the Internet.
If you have any questions on this post, please post and i'll do my best to respond. Hopefully this will help one more person resolve their performance issues with Leopard.

Hi Karsten and thanks for the suggestion!
I have exempted internal networks and can connect them via the VPN connection. I also got connectivity to the outside world with nat (outside,outside) and 'same-security-traffic permit intra-interface'.
A question remains though. At the moment, all traffic gets out of the network through the 'outside' interface IP (.22). I'd rather use a dedicated address from the /29 on GigabitEthernet0/0. Is this possible to achieve that? To put it differently, I'd like to NAT the VPN range onto an address that is not the 'outside' interface, like I did in this statement, for instance:
nat (v200,outside) source dynamic v200_private v200_public
My other question is, whether the single NAT statement [nat (outside,outside) dynamic interface] is sufficient for VPN traffic and whether the original statement can be removed [nat (vpn,outside) source dynamic vpn_pool vpn_public].
Thanks once again for the tips!
R.

Missing video just sound with a black screen

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More information needed for someone to help... please click below and provide the requested information
-Premiere Pro Video Editing Information FAQ http://forums.adobe.com/message/4200840
•What is your exact brand/model graphics adapter (ATI or nVidia or ???)
•What is your exact graphics adapter driver version?
•Have you gone to the vendor web site to check for a newer driver?
•For Windows, do NOT rely on Windows Update to have current driver information
•-you need to go direct to the vendor web site and check updates for yourself
•ATI Driver Autodetect http://support.amd.com/en-us/download/auto-detect-tool
•nVidia Driver Downloads http://www.nvidia.com/Download/index.aspx?lang=en-us
AVI is a wrapper, what is inside YOUR wrapper - Exactly what is INSIDE the video you are editing?
Codec & Format information, with 2 links inside for you to read http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30 for screen shot instructions
Free programs to get file information for PC/Mac http://mediaarea.net/en/MediaInfo/Download

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where everything is going towards the center...
I cant seem to figure it out...
do I have to make seperate 1 perspective grids for each side??

oh wow!
did you make that video just for me!?
thanks. it helped a lot.
so the grid actually has to be moved around? I figured ti was just guidelines that help you. but they actually affect the art work?
So I made a few objects and there flying out from the center of this perspective.. I wanted to place a number on each object and some have 3d extrude effects on them and I mapped numbers onto my objects.
Some object dont have extrude and I am trying to match the number up with their perspective but the type tool doesnt work with the perspective tool as well I dont think...
I could use envelope but I dont know if it will look perfect. is there a way to do this?

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Please help

Hi Craig,
I also got the second problem. The storyboard on iMovie trailer has all these missing videos. If I import them on my iPad it doesn't find them.
If you find a solution it would be much appreciated to share it here ... I'll do the same.
Thanks,
Rafael

My Macbook Pro has a black screen when running in Bootcamp Windows 7. Since I updated the mac side my windows side now starts up with completely black screen - no prompt, nothing, Cap keys still light up as does mouse and DVD drive seems to run.

My Macbook Pro has a black screen when running in Bootcamp Windows 7. Since I updated the mac side my windows side now starts up with completely black screen - no prompt, nothing, Cap keys still light up as does mouse and DVD drive seems to run.
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I suspect the Mac update wiped out my PC video drivers but can not think of a way to re-install?
Can see the PC volume from Mac side with files.
I've looked at all the online solutions so far and have tried most of them without success. Please help!
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2009 Macbook Pro, 3.06 GHz Intel 2 core, Max 10.6.8.
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Processor Speed:          3.06 GHz
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EDIT: RESOLVED
For anyone else who finds their way here like I did, this link did it for me: https://forums.geforce.com/default/topic/527599/windows-8-issues-solved-please-r ead-if-you-39-re-having-black-screen-and-or-flickering-/
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Many thanks
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Sergio,
Pleased to hear of the Metalink proposal.
I can't really import my app - it's dependent on 4000+ database objects.
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John
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Imovie media browser only has one option, "Mobile". other videos had option for medium and small. mobile option wont import into iDVD. other videos gave me the Medium option, why not this one?

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When I render out my video for some reason there are black horizontal bars on the sides of the video output. I assume this has to do with some settings that I am unaware of.
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[5400:4968:0613/153602:ERROR:connection.cc(733)] sqlite error 19, errno -2: PRIMARY KEY must be unique
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ End ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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http://support.apple.com/kb/ht1199
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VIMEO share has inexplicable "black holes" (missing video)

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