Re: DataCodecCompress and zLib problem (solved)

From: Date: Fri, 28 Oct 2005 21:41:12 +0000
Subject: Re: DataCodecCompress and zLib problem (solved)
References: 1 2 3 4 5 6 7  Groups: php.general 
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DOH! OK, I was starting at the wrong place in the hex.... I misread the QTFF docs which include two more atoms on the next page: 
Four-character code           Atom type
'cmvd'                                    Compressed movie data
Uncompressed size            32-bit integer
The correct output is now: //----------------------------------------------------- The uncompressed movie header string is: trak\tkhd??7???7?X??@$edtselstXnmdia mdhd??7???7?XXH?hdlrmhlrsprtappl?Sprite Animation Media Handlerminf gmhdgmin@??????9hdlrdhlralisappl?Apple Alias Data Handler$dinfdref 
                                                                                                                                                                           alis?stbl,stsdzlibsttsXstscstszstco&?code?sean       emk
hjkedtligudta 
             namedrm]udta#?swrMade with LiveStage Proplugmoviename=drm.mov
                                                                          ctypnone      play
//----------------------------------------------------- Compressed in Livestage: the compressed movie header string is: x??S?n1?l?P?H ՂV"G?q@???T?ppbg????l7Q??z?+??Џ???8Nw??}?x?????.@?Z???^w?????| ?=??9???[?????o??~4???k??e?soo?C7? ??P???7?&Fs???4?ǻ? 
                  ?,?u????gU?K?s?ꬲҋld?f^?&;H????J`Z?PK3#?\?A??Mͷa???oe8?0%?<??????*J2?3??!?܊Y?;?D??O??7?;޸??;?Vr??C??m?R?????
ӂ[Cߢ??o???8a\dK??\?3?r??Z?ߋJ??\HA?????ԯ*Sj?A??*0?F?]                                                                         c?8×?oZ6f p?;-?hM??        fb?A?!?O?9
//----------------------------------------------------- The zlib version of the uncompressed movie header using gzcompress at level 6 is: x??SMN?@~v?ZZ*uQH@??T?U?m?EU??`?HHٰ??!3??̌??I9K?-8E?8??H?s?qb?EG?4o???=??:?:ϧ??4?ß?/????D??k??>.-?o????[6F?̏K?N?Y?յ??Ѝ???P???????撡?h?̻#?g\Y??LYWXϊB?,Qt?~XX?Erd?f^??M???J`Y?BKsA2?.ez):=????Z?p?aJ:?y??y??U?d.??????@?[q?2?-" ??????'?_??7':S?<?{Η3?b????1Z?/?c?p???o????;ʹh??̄????h?>?]?Z??b????Fd??(87ɷ???4?$?ZmP?l?Ri#uѝpO_?kô?V?Я??p?.-t???R?,?)?b?Y*?K??-?$??T ????u??n??UarC??,??t_???? //----------------------------------------------------- the uncompressed zlib movie header string using gzuncompress is: trak\tkhd??7???7?X??@$edtselstXnmdia mdhd??7???7?XXH?hdlrmhlrsprtappl?Sprite Animation Media Handlerminf gmhdgmin@??????9hdlrdhlralisappl?Apple Alias Data Handler$dinfdref 
                                                                                                                                                                           alis?stbl,stsdzlibsttsXstscstszstco&?code?sean       emk
hjkedtligudta 
             namedrm]udta#?swrMade with LiveStage Proplugmoviename=drm.mov
                                                                          ctypnone      play
//----------------------------------------------------- Here is the attempt to use gzuncompress with the movieheader compressed in Livestage: trak\tkhd??7???7?X??@$edtselstXnmdia mdhd??7???7?XXH?hdlrmhlrsprtappl?Sprite Animation Media Handlerminf gmhdgmin@??????9hdlrdhlralisappl?Apple Alias Data Handler$dinfdref 
                                                                                                                                                                           alis?stbl,stsdzlibsttsXstscstszstcoe?code?sean       emk
hjkedtligudta 
             namedrm]udta#?swrMade with LiveStage Proplugmoviename=drm.mov
                                                                          ctypnone      play
On Oct 28, 2005, at 2:26 PM, Graham Anderson wrote:
Ok, here we go :) Isn't looking through reams of hex data a blast ? Kind of like a hot poker in the eye ;) curl -l -i "http://www.siren.cc/siren/reel/Library/php/zlib.php" Here are two versions of the SAME test movie exported from Livestage: One version has compressed movie headers The other version has uncompressed movie headers With zLib, I am using gzcompress at compression level 6, and gzuncompress. All the string data below was converted from hex with the pack() function. The actual php script I wrote for this test is way way below. The upshot: 1)Using zlib to compress and decompress a movie header seems to work fine :) 2)Attempting to 'gzuncompress' a movie header that was compressed in Livestage gives an error. I doubt this is fault of Livestage which I assume is simply calling DataCodecCompress or an equivalent function, no ? 3) The Livestage'd compressed movie header output IS NOT THE SAME as a the zLib'd compressed movie header output Maybe I am not starting at the correct point in the compressed movie header string? hopefully, this is enough to start a dialog. here is the output: //----------------------------------------------------- The uncompressed movie header string is: trak\tkhd??7???7?X??@$edtselstXnmdia mdhd??7???7?XXH?hdlrmhlrsprtappl?Sprite Animation Media Handlerminf gmhdgmin@??????9hdlrdhlralisappl?Apple Alias Data Handler$dinfdref 
                                                                                                                                                                           alis?stbl,stsdzlibsttsXstscstszstco&?code?sean       emk
hjkedtligudta 
             namedrm]udta#?swrMade with LiveStage Proplugmoviename=drm.mov
                                                                          ctypnone      play
//----------------------------------------------------- Compressed in Livestage: the compressed movie header string is: 
?cmvd?x??S?n1?l?P?H     ՂV"G?q@???T?ppbg????l7Q??z?+??Џ???8Nw??}?x?????.@?Z???^w?????|  ?=??9???[?????o??~4???k??e?soo?C7?
??P???7?&Fs???4?ǻ? 
                  ?,?u????gU?K?s?ꬲҋld?f^?&;H????J`Z?PK3#?\?A??Mͷa???oe8?0%?<??????*J2?3??!?܊Y?;?D??O??7?;޸??;?Vr??C??m?R?????
ӂ[Cߢ??o???8a\dK??\?3?r??Z?ߋJ??\HA?????ԯ*Sj?A??*0?F?]9                                                                        c?8×?oZ6f p?;-?hM??        fb?A?!?O?9
//----------------------------------------------------- The zlib version of the uncompressed movie header using gzcompress at level 6 is: x??SMN?@~v?ZZ*uQH@??T?U?m?EU??`?HHٰ??!3??̌??I9K?-8E?8??H?s?qb?EG?4o???=??:?:ϧ??4?ß?/????D??k??>.-?o????[6F?̏K?N?Y?յ??Ѝ???P???????撡?h?̻#?g\Y??LYWXϊB?,Qt?~XX?Erd?f^??M???J`Y?BKsA2?.ez):=????Z?p?aJ:?y??y??U?d.??????@?[q?2?-" ??????'?_??7':S?<?{Η3?b????1Z?/?c?p???o????;ʹh??̄????h?>?]?Z??b????Fd??(87ɷ???4?$?ZmP?l?Ri#uѝpO_?kô?V?Я??p?.-t???R?,?)?b?Y*?K??-?$??T ????u??n??UarC??,??t_???? //----------------------------------------------------- the uncompressed zlib movie header string using gzuncompress is: trak\tkhd??7???7?X??@$edtselstXnmdia mdhd??7???7?XXH?hdlrmhlrsprtappl?Sprite Animation Media Handlerminf gmhdgmin@??????9hdlrdhlralisappl?Apple Alias Data Handler$dinfdref 
                                                                                                                                                                           alis?stbl,stsdzlibsttsXstscstszstco&?code?sean       emk
hjkedtligudta 
             namedrm]udta#?swrMade with LiveStage Proplugmoviename=drm.mov
                                                                          ctypnone      play
//----------------------------------------------------- Here is the attempt to use gzuncompress with the movieheader compressed in Livestage: <br /> <b>Warning</b>: gzuncompress(): data error in <b>/home/www/siren/siren/reel/Library/php/zlib.php</b> on line <b>34</b><br /> Here is the PHP script: <?php $uncompressed_movieheader_hex="000003DE6D6F6F760000006C6D76686400000000BF883792BF883792000002580000025800010000010000000000000000000000000100000000000000000000000000000001000000000000000000000000000040000000000000000000025800000000000000000000000000000000000000020000030D7472616B0000005C746B686400000003BF883792BF8837920000000100000000000002580000000000000000FFFE000000000000000100000000000000000000000000000001000000000000000000000000000040000000000200000002000000000024656474730000001C656C737400000000000000010000025800000000000100000000026E6D646961000000206D64686400000000BF883792BF8837920000025800000258000000480000003F68646C72000000006D686C72737072746170706C00000001000101C11E53707269746520416E696D6174696F6E204D656469612048616E646C6572000002076D696E6600000020676D686400000018676D696E000000000040FFFFFFFFFFFF000000000000003968646C720000000064686C72616C69736170706C10000001000101D2184170706C6520416C69617320446174612048616E646C65720000002464696E660000001C6472656600000000000000010000000C616C697300000001000000907374626C0000002C7374736400000000000000010000001C000000000000000000000001000000007A6C6962000000000000001873747473000000000000000100000001000002580000001C737473630000000000000001000000010000000100000001000000147374737A000000000000021D00000001000000147374636F000000000000000100000426000000F2636F6465000000000000000000000000000000DE7365616E0000000100000009000000000000001A00000065000000010000000000000000000000000000000000160000006D0000000100000000000000000001000000180000006B0000000100000000000000000000000A000000150000006800000001000000000000000001000000150000006A00000001000000000000000000000000156B65647400000001000000000000000000000000160000006C000000010000000000000000000000000015000000690000000100000000000000000100000018000000670000000100000000000000000000000400000017756474610000000B6E616D6564726D000000000000005D7564746100000023A9737772001700004D6164652077697468204C69766553746167652050726F00000019706C75676D6F7669656E616D653D64726D2E6D6F760000000C637479706E6F6E6500000009706C6179000000000000000008"; $compressed_movieheader_hex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uncompressed_movieheader_string = pack("H*", $uncompressed_movieheader_hex); echo '//-----------------------------------------------------'."\n\r"; echo "The uncompressed movie header string is:". "\r\n"; echo $uncompressed_movieheader_string."\r\n\r\n"; $compressed_hexstring = pack("H*", $compressed_movieheader_hex); echo '//-----------------------------------------------------'."\n\r"; echo "Compressed in Livestage: the compressed movie header string is:"."\r\n"; echo $compressed_hexstring."\r\n\r\n"; $compressed_zlib_movieheader_string = gzcompress($uncompressed_movieheader_string, 6); echo '//-----------------------------------------------------'."\n\r"; echo "The zlib version of the uncompressed movie header using gzcompress at level 6 is: "."\r\n"; echo $compressed_zlib_movieheader_string."\r\n\r\n"; $decompressed_zlib_movieheader_string= gzuncompress($compressed_zlib_movieheader_string); echo '//-----------------------------------------------------'."\n\r"; echo "the uncompressed zlib movie header string using gzuncompress is: "."\r\n"; echo $decompressed_zlib_movieheader_string."\r\n\r\n"; echo '//-----------------------------------------------------'."\n\r"; echo "Here is the attempt to use gzuncompress with the movieheader compressed in Livestage: "."\r\n"; $decompressLSCompressedMovieHeader= gzuncompress($compressed_hexstring); echo $decompressLSCompressedMovieHeader."\r\n\r\n"; ?> On Oct 28, 2005, at 12:17 PM, Graham Anderson wrote:
will do ... and report back.... g On Oct 28, 2005, at 8:20 AM, Steve Israelson wrote:
Write a program. Take a buffer of test data. Compress it using the data compressor and the zlib component. Save that data. Compare it to the same data compressed using YOUR zlib, or try to decompress it. That should help clarify things. On 28-Oct-05, at 8:07 AM, Graham Anderson wrote:
Well, after sleeping on this, I need the zlib Library on my server to correctly decompress a QT zlib'd movie header If I have to process a movie with a compressed movie header, I'm screwed :( So, what's the deal with zlib and QT ?
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