How to parse VP8 bitstream with libav -

-

I have just started learning about VP8, so give me some lethargy if this is a dumb question.

H.264 example

In the past I have worked mostly .264 Whenever I need to parse H.264bit currents, then I will have to take advantage of libav to help and use something like this 

  av_register_all (); _ioContext = avio_alloc_context (Encoded Data, H264_READER_BUF_SIZE, 0, 0, Read, Function, Faucet, Zero); If (_ioContext == NULL) throwing std :: exception ("unable to create AV IO reference"); AVInputFormat * h264Format = av_find_input_format ("h264"); If (h264 format == faucet) {std :: exception ("Unable to find H264 format"); } _context = avformat_alloc_context (); _context- & gt; Pb = _ioContext; Ret = avformat_open_input (& amp; _context, "", h264 format, NULL); If (ret! = 0) {std :: exception ("failed to open the input file:" + std :: string (_avErrToString (ret)); }   
 VP8  
 The above method is great for parsing H.264 bit currents and feeding H.264 frames to its own decoding infrastructure. work done.  
 I am also trying to duplicate this effort with VP8. I tried to use this code as a base and instead of searching the "h264" format, I tried "vp8" and "webm" "Vp8" is not valid, but "webm" is loading a format Is capable of However, when I get avformat_open_input I get this error:  
 
 [matraska, webm @ 0x101812400] unknown entry 0xF0 
 [matraska, webm @ 0x101812400] EBML header using unsupported features 
 
 EBML Version 0, Principle (zero), Doctor version 0) 
 Failed to open the input file: PF is now not implemented in FFMPG, patch is welcome   
 Am I watching? Or am I doing this wrongly?   
 
 
 I am using the C # wrapper for FFMPEG \ LibAV (especially the example file) It has the same syntax as C ++, and it works fine.  
 The error message says that it has not been implemented yet, so I suggest updating your Library Library.  
 The piece of code that is working (including the AVInputFormat amendment in me, which is not present in the linked file):  
  FFmpegInvoke.av_register_all () ; FFmpegInvoke.avcodec_register_all (); FFmpegInvoke.avformat_network_init (); String url = @ "c: \ file.webm"; AVFarmTontact * PFormatContact = FFMPGINWock.Vermat_Aloc_Context (); AVInputFormat * pFormatExt = FFmpegInvoke.av_find_input_format ("webm"); If (FFmpegInvoke.avformat_open_input (& amp; pFormatContext, url, pFormatExt, null)! = 0) new exception throw ("file can not be opened"); // To throw any exception, more code is thrown, and the frames are successfully decoded   
 If this does not work, then you might find that the file is incorrectly Opening (second  avformat_open_input  is empty).  
 Perhaps try to specify a file path?

Comments

Post a Comment

Popular posts from this blog

ios - Adding an SKSpriteNode to SKScene from a child SKSpriteNode -

-
I have a SKScene where I am adding an SKSpriteNode I have subclassed the SKSpriteNode class to create this node. In the subclass I am defining some SKActions on Sprite. What do I want to do when the end of this phantom ends the SKAction sequence, then I add a new Prayer node to this scene. How is this possible. The following code is mine: The code for the sequence is that I'm running on the Scansprinitode subclass (TEMissileNode): - SKAction * moveDown = [SKAction moveToY: Self.position.y - 20 Duration: 0.2]; SKAction * animation = [SKAction animateWithTextures: textures timePerFrame: time / 7]; SKAction * moveMissileProjectile = [SKAction Moving: Pointoffscreen Term: Time]; SKAction * group = [SKAction group: @ [animation, movement projectile]]; SKAction * Sequence = [SKAction Sequence: @ [Hilldown, Group, [SKAction removalFromParent]]]; [Self run action: sequence]; From the main scene, I call those actions that execute these tasks TEMissileNode * missile = [tmissil...
Read more

Matlab transpose a table vector -

-
An embarrassing simple question seems to be, but how can I move a Matlab table vector? aTableT = aTable '; I tried a standard syntax for the simple interaction of a line vector to a line vector aTable : ATableT = reshape (aTable, 1, Height (aTable)); and aTableT = rot90 (aTable); According to the head, the last time table should work for table, see. However, I get this error code: Error type in using table / permit (line 396) Undefined function 'permute' for the input arguments. Error in rot 90 (line 29) b = magnitude (b, [2 1 3: ndims (a)]); NB: fliplr is not useful either pretty sure I have covered clear angles - any ideas? Thanks! Try changing your table into an array, move it, then back to a table In other words, try doing this: aTableArray = table2array (aTable); ATableT = array 2table (aTableArray. '); I have also read the document for rot90 , and it says that rot90 is definitely working for tables Do, and I find you...
Read more

c# - Textbox not clickable but editable -

-
I have a small form with 10 text boxes, I have set them in the correct tab order. I want them on my tab service I was wondering if there is a way to set the text box so that they can be selected for editing until they are tabbed. That is ... I do not want the end user to edit the text box to click on them, I just want to make them editable through tabu. this should do the trick public partial category poor text box: Text Box {Safe Override Zero WndProc (Ref: Message Message) {if (m.msg == (Int) WM.LBUTTONDOWN) {Return; // mount down events} base.WndProc (ref m); }} Window message enum can be found. How to do this without anherizing: text box : class EatMouseDown: netwindows {safe override zero WndProc (ref message message) {if (m.msg == (int) WM.LBUTTONDOWN) {return; } Base.WandProc (Ref M); }} Safe Override Zero Onload (EventEurge E) {base.OnLoad (e); How to do this without any part: left a clean part, whatever is important, this can be a buggy but it works R...
Read more