bitstream | C headers allowing a simpler access
kandi X-RAY | bitstream Summary
kandi X-RAY | bitstream Summary
libdvbpsi converts binary structures to C structures. Lists are implemented with chained lists of C structures. biTStream is lower level, and more efficient: fewer memory allocations, fewer memory copies. It also features a better separation between layers and specifications.
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Trending Discussions on bitstream
QUESTION
FFMPEG allows to set User Data Unregistered in SEI block with h264_metadata
bitstream filter:
ffmpeg -i input/test.mp4 -bsf:v "h264_metadata=sei_user_data=c5bfd5ee-b030-11ec-b909-0242ac120002+waagh" -f h264 test.h264
I know it is possible to use FFMPEG expression evaluation mechanism in filter bodies, is it possible to do that in bitstream filter bodies? More specifically, I would like to encode a current Unix timestamp into SEI block to calculate actual latency during playback.
None of my attempts to use expressions in bitstream filter bodies worked.
...ANSWER
Answered 2022-Apr-05 at 11:22The implementation is per-option rather than per-filter or per component type. For sei_user_data in h264_metadata, it's not implemented.
QUESTION
I try to create IP Block in vivado and launch SDK but Launch SDK does not appear file menu.
1-I create a project and I choice the zedboard Zynq Evaluation Board
2-I create a block design and I add a ZYNQ7 Processing System.
3-Then I connect the M_AXI_GPI0_ACLK to FCLK_CLK0.
4-Configuring ZYNQ Processing System IP (I choice the zedboard from presets menu)
5- Validate design
6-Create HDL wrapper
7-Generate Outputs Products
8-Generate Bitstream
9-File>export>export hardware(Include bit stream is on)
After this step I need to open SDK but when I open file menu there is no Launch SDK option. In addition I dont close the implemented design, or the block design Why Launch SDK does not appear?
...ANSWER
Answered 2022-Mar-09 at 13:09Possible 2 solutions:
SDK is probably reading settings from an outdated .eclipse folder or an outdated workspace. Try opening SDK with a fresh workspace. If that does not work, remove your $HOME/.eclipse folder.
Apparently the Vivado SDK is built into Vitis, and you have to load the exported .xsa file into Vitis after launcing Vitis from the Tools tab in your Vivado. If your looking to import an old SDK project into the new Vitis tool, this link might be useful.
QUESTION
When I click the write
button, the value of input should be displayed inside span with id caption
in the form of typing effect. But the speed of typing of any character should be 30ms. to this mean when displayed the first character, the second character displayed with a delay of 30ms And also to the end. displaying of text does with a delay of 30ms(the first setTimeout
). I wrote the below code but it did not work. the output is in to form of numbers. how to fix it?
ANSWER
Answered 2022-Feb-18 at 14:58QUESTION
I've come to learn that there are linear time sorting algorithms that don't run by comparisons like radix sort. My hope is to have a sorting algorithm that runs in linear time but can also run in constant time by running n threads for n elements. From the research I've done, this seems possible on a PRAM CRCW machine but I've found conflicting information as to whether the algorithm that runs on a PRAM CRCW machine can be run on a standard consumer computer in the same constant time.
FYI, the algorithm in question is here. This is pretty interesting as well.
Is it possible?
...ANSWER
Answered 2022-Feb-14 at 19:25Q : "Is it possible ( to implement PRAM CRCW on consumer processor ) ?"
A :
Let's clarify the facts first. We can agree on what "consumer"-processors are - the most often a COTS term is right this - a Custom-Over-The-Shelf processor, as anyone can go and buy. So is the set of properties of any such COTS hardware, being pre-defined by the silicon structures pre-fabricated "inside" such processor.
On the contrary, the CRCW PRAM term is knowingly & intentionally a highly abstract, ultimately idealised property of any such processor architecture, that can (without having any limits in time or other compromises) Concurrently Read (under any and all levels of parallelism) and also Concurrently Write (under any and all levels of parallelism) from/into any memory location ("address") all at once, adding some additional créme-a-la-créme property, like to performe a sum of all CW-s, before actually storing a such resulting value. Any such physical implementation of these abstract properties, that meets them all under any circumstances, having no exceptions to doing so in full parallel-mode, can be called a CRCW PRAM and never otherwise.
This said, the CRCW PRAM architecture is by far not met, not even being anywhere close to it, in any of the current COTS processor hardware silicon.
Such question is leading, by definition, to actually unachievable wish to have an architecture-A get "implemented" by using an architecture-B (which can never be turned into meeting an architecture-A, even if composing many such COTS processors (as defined) into some interconnected macro-structure, which may turn some of the COTS hardware properties a bit "closer" to the CRCW PRAM, yet at such devastatingly adverse costs or slowness of operations, that such attempts can result but in something ultra-expensive + ultra-power-inefficient + ultra-slow ( being about N2 ~ 3 sub-sampled and having a need to artificially "wait" for all the slowest parts for a full-width of the parallelism to get physically completed, if viewed from the macro-structure point of view).
Using any amount of superscalar, M-way pipelined, out of order executing CISC silicon for achieving a macro-structure topological trick just for simulating a "slowed down" CRCW PRAM is IMHO technically not a right way to go ( if we want to enjoy a reasonably practical O( k )-sorting machine ).
If using a current level of QPU processors, we may "somehow" enjoy a constant time QUBO (a single hardware-instruction quantum processor in the current line of the D-WAVE systems' machines ), I would hesitate to consider this corner-case (topologically setup to bear "inital" state and letting The Nature ( the laws of physics ) to "execute" a quantum-annealing "algorithm" to result in a statistical-distribution of results, answering the problem solution in constant time ) a COTS, which it is not, is it?
QUESTION
I'm trying to convert a video file (.mp4
) to a Dicom file.
I have succeeded to do it by storing single images (one per frame of the video) in the Dicom,
but the result is a too large file, it's not good for me.
Instead I want to encapsulate the H.264 bitstream as it is stored in the video file, into the Dicom file.
I've tried to get the bytes of the file as follows:
ANSWER
Answered 2022-Feb-09 at 08:59The trick is to redirect the value of the attribute PixelData to a file stream. With this, the video is loaded in chunks and on demand (i.e. when the attribute is accessed). But you have to create the whole structure explicitly, that is:
- The Pixel Data element
- The Pixel Sequence with...
- ...the offset table
- ...a single item containing the contents of the MPEG file
Code
QUESTION
I have an HEVC encoded bitstream (.bin and equivalent .mp4 file). I want to remove some frames from the bitstream to see how a decoder (or media player) behaves when a particular frame is lost.
How I can remove a frame (or a NAL unit) from the bitstream? What tools can be used?
Thanks
...ANSWER
Answered 2022-Feb-08 at 11:34With ffmpeg, you can use the drop option of the noise bitstream filter.
QUESTION
I have written a 8b10b encoder that generates a stream of bytes intended to be sent to a serial transmitter which sends the bytes as-is LSb first.
What I'm doing here is basically lay down groups of 10 bits (encoded from the input stream of bytes) on groups of 8, so a varying number of bits get carried over from one output byte to the next - kind of like in music/rhythm.
The program has been successfully tested, but it is about 4-5x too slow for my application. I think it comes from the fact that every bit has to be looked up in an array. My guts tell me we could make that faster by having some sort of rolling mask but I can't yet see how to do that even by swapping out the 3d array of booleans to a 2D array of integers.
Any pointer or other idea?
Here is the code. Please ignore most of the macros and some of the code related to deciding which byte is to be written as this is application-specific.
Header:
...ANSWER
Answered 2022-Jan-29 at 13:48This will be a lot faster if you do everything a byte at time instead of a bit at a time.
First change the way you store your lookup tables. You should have something like:
QUESTION
I want to build a PetaLinux Image for my Ultra96v2. I followed this guide up until building my application project in Vitis. It looks promising but then while building the application project for my custom platform, Vitis throws this error:
...ANSWER
Answered 2022-Jan-18 at 12:17PLEASE READ THE WHOLE ANSWER FOR ACTUAL SOLUTION
I think I got it now, though I did not verify whether the image actually works on my Ultra96v2, yet.
I noticed, that the weird path with commata is inside of the boot.bif
and system.bif
.
So the first time I tried to build it, the bif wasnt there, but got created (I assume). The bif was ready then but only had a weird path inside, so I took the makefile (you can find it in debug/sd_card), copied it, and just commented out the line GENERATE_BIF_XSCT_CMD = ${GENERATE_BIF} -xpfm ${XPFM_PATH} -domains ${DOMAINS} -bifpath ${BIF_PATH}
.
Then I edited the boot.bif
and system.bif
and changed the atf,boot
, uboot,boot
, and dts,boot
to just boot
, so the BootGen wouldnt look into the directories with the commata anymore, but only the boot-directory which was specified.
Once that was set up, I executed the edited makefile in my console, by going into the sd_card-directory and executing the following command:
QUESTION
I am following a tutorial on how to program the PL at run time for my ZedBoard. Tutorial Here.
But I am stuck on the step where it says to Convert.bit into.bin
.
From my understanding the difference between the two file types is that a bitstream contains a header.
Is there a command I can use to convert this, is there something in the XSDK that I can do to generate it from start up, or is there a way to manually strip the header file and rename it as a .bin?
...ANSWER
Answered 2022-Jan-15 at 23:03Following are some of the options:
Once you have generated the bitsteam (.bit file) from Vivado/Vitis, run the following command to get a boot image (.bin file):
bootgen -image boot.bif -o i boot.bin
Further, you can also run the following command to split the image to get the bitstream binary
bootgen -image boot.bif -split bin -w on -p xc7kxxxx -o i boot.bin
Else you can set that option in bitstream settings while using Vivado GUI.
Or you can also try this script.
You can also check the official Xilinx video for How to Convert Bitstream to Raw Binary Using BootGen
QUESTION
I'm having problems changing the size of the text and the image in css. I'm just starting to use html and css. This is my code.
...ANSWER
Answered 2021-Dec-30 at 16:25You are using the font-family property to set both the size and font-family of the text1 class. font-family property is used to set the font family only. So, use this
{font:17px Olney,"Trebuchet MS",Tahoma,Arial,"Lucida Sans Unicode","Bitstream Vera Sans","DejaVu Sans",Sans-serif;}
instead of font-family
Or you can specify the font-size and font-family separately like { font-size:17px; font-family:"Trebuchet MS",Tahoma,Arial,"Lucida Sans Unicode","Bitstream Vera Sans","DejaVu Sans",Sans-serif; }
And if you want to set the width of the image to be 50% then you have to provide some width to the parent div of the image.
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