decoding

问题 I'm looking for a algorithm of finding reference frames in h264 stream. The most common metod I saw in different solutions was finding access unit delimiters and NAL of IDR type. Unfortunatelly most streams I checked didn't have NAL of IDR type. I'll be gratefull for help. Regards Jacek 回答1: H264 frames split up by a special tag, called the startcode prefix, which is either of 0x00 0x00 0x01 OR 0x00 0x00 0x00 0x01 . All the data between two startcodes comprises a NAL unit in H264 speak. So

问题 I'm looking for a algorithm of finding reference frames in h264 stream. The most common metod I saw in different solutions was finding access unit delimiters and NAL of IDR type. Unfortunatelly most streams I checked didn't have NAL of IDR type. I'll be gratefull for help. Regards Jacek 回答1: H264 frames split up by a special tag, called the startcode prefix, which is either of 0x00 0x00 0x01 OR 0x00 0x00 0x00 0x01 . All the data between two startcodes comprises a NAL unit in H264 speak. So

问题 As many of us know, there's been a recent situation with Apple where hackers are able to get any In-App Purchase for free. Apple recently released this document describing how to patch it, but I'm a bit confused on step #4 and would appreciate any help. The first steps are to download their patch .h and .m, include it in your project, and link it against the Security framework. Okay, good, got it. Then Apple says: 4. Provide a base64 encoder, a base64 decoder, and the action to perform when

问题 I am having some interesting results trying to discern the differences between using Encode::decode("utf8", $var) and utf8::decode($var) . I've already discovered that calling the former multiple times on a variable will eventually result in an error "Cannot decode string with wide characters at..." whereas the latter method will happily run as many times as you want, simply returning false. What I'm having trouble understanding is how the length function returns different results depending

问题 This is my first question so please let me know if I missed anything! Using Android API 16's new Media Codec implementation to try and decode a video so that I can send frames to be applied as a texture (the texture part is already done). So I have come up with the following code with some help off stack but in runOutputBuffer() my outputBufIndex is coming back -1 (or in an infinite loop as I have provided -1 as a timeout) can anyone help with this, and/or provide any advice on where to go

问题 I'm trying to figure out how to use Android's MediaCodec class to decode H.264 video. To start, I'm trying to manually parse the NAL units out of an H.264 file and feed them to MediaCodec for decoding. I believe I'm parsing the NAL units out of the file correctly (searching for 0x00 0x00 0x01 sequence in file, indicates the start of a NAL unit), but MediaCodec always times out and returns -1 each time I make a call to dequeueOutputBuffer(). Does anyone know the specifics of how to feed H.264

问题 This question already has answers here : How to decode a Unicode character in a string (2 answers) Closed 3 years ago . I have a string "Some string that I am using but Poacher\u2019s shows unicode!" I'm trying to have the Unicode convert into the ' character. 回答1: Something like that should work : Encoding.UTF8.GetString(Encoding.Convert(Encoding.Unicode, Encoding.UTF8, Encoding.Unicode.GetBytes("Some string that I am using but Poacher\u2019s shows unicode!"))); Please see the Encoding class

问题 This question already has answers here : How to decode a Unicode character in a string (2 answers) Closed 3 years ago . I have a string "Some string that I am using but Poacher\u2019s shows unicode!" I'm trying to have the Unicode convert into the ' character. 回答1: Something like that should work : Encoding.UTF8.GetString(Encoding.Convert(Encoding.Unicode, Encoding.UTF8, Encoding.Unicode.GetBytes("Some string that I am using but Poacher\u2019s shows unicode!"))); Please see the Encoding class

问题 I cant find how to decode string encoded in sha1. I'm suprised that i can't find simple function in python docs or google doing sha1 decoding. I give up. I need help.. 回答1: SHA1 is a hashing algorithm. Hashing is one-way, which means that you can't recover the input from the output for any non-trivial hash function. A simple example of a one-way hash function would be adding together all the digits of a number. 1234 would hash to 1 + 2 + 3 + 4 = 10 , but so would 4321 , 1900 , 5050 , and many

问题 I'm acquiring the unread mails I have in my GMail account through PHP and its method imap_open When I get the subjects through the method imap_fetch_overview I get some subjects like this: =?ISO-8859-1?Q?Informaci=F3n_Apartamento_a_la_Venta?= =?ISO-8859-1?Q?_en_Benasque(Demandas:_0442_______)?= It's unreadable, I think because of its character encoding. What should I do to make it readable? 回答1: To get the string in UTF-8, do: $or = '=?ISO-8859-1?Q?Informaci=F3n_Apartamento_a_la_Venta?= =?ISO