Panasonic P2 card MXF recovery process and ideas

Taiyuan a TV station Panasonic machine shooting P2 card, misoperation caused the data all lost, because the program needs to broadcast, only overtime to restore data, generally Panasonic format words may be deleted after the majority of data directly cleared, customer luck is better, the underlying data has not been cleared!

650) this.width=650; "height=" 581 "src=" http://a4.qpic.cn/psb?/3f5c8523-1307-46e4-8b77-488d3ae94387/ zft3epvvjl2mff6ds1urm32ms3naphg*mmyjrtdj2gg!/b/dgmaaaaaaaaa&ek=1&kp=1&pt=0&bo=eangagaaaaadahi! &su=0171133409&sce=0-12-12&rf=2-9 "width=" 553 "style=" margin:0px;padding:0px;border-width:0px; border-style:none;vertical-align:top; "alt=" Dgmaaaaaaaaa&ek=1&kp=1&pt=0&bo=eangagaaa "/>

 

650) this.width=650; "height=" 437 "src=" http:/ a4.qpic.cn/psb?/3f5c8523-1307-46e4-8b77-488d3ae94387/kma4zexk3uv2.5bxloiktqk6xutlu5ztf.falu05o2s!/b/ Dacaaaaaaaaa&ek=1&kp=1&pt=0&bo=kgk2aqaaaaadalo!&su=0124033729&sce=0-12-12&rf=2-9 " Width= "553" style= "margin:0px;padding:0px;border-width:0px;border-style:none;vertical-align:top; alt=" Dacaaaaaaaaa&ek=1&kp=1&pt=0&bo=kgk2aqaaa "/>

P2 card audio and video are stored in different directories, but at the physical level is continuously stored in a non-segmented block of data, so unified to extract these data blocks, is the completion of the first phase of the work, then we based on the customer provided the sample storage structure analysis, found that storage has a certain storage law, But unfortunately the data recovered according to the law is a failure, because the extracted data 100% all have problems, there are flower screen and mosaic problems. So into a pair of samples of the file analysis, according to the MXF file analysis we found that the MXF file structure can be used as video fragment extraction based on, but this solution to extract the recovered video is small fragments, but the customer to the video integrity of the high requirements of such small fragments is not enough to meet the demand, So abandon this programme.

Through the analysis of MXF audio and video, because the video and audio are encoded differently, the audio uses the G711A encoding, so it creates the possibility of separating video and audio, we cut the video into 32KB cluster size, and use the information entropy algorithm to calculate the data block.

650) this.width=650; "height=" 361 "src=" http://a4.qpic.cn/psb?/3f5c8523-1307-46e4-8b77-488d3ae94387/ 5ylrma1flsy3ia1cerh2vn3whvsymdx25fhd8vzxj1a!/b/dfmaaaaaaaaa&ek=1&kp=1&pt=0&bo=kgjqaqaaaaadagy! &su=0139915793&sce=0-12-12&rf=2-9 "width=" 553 "style=" margin:0px;padding:0px;border-width:0px; border-style:none;vertical-align:top; "alt=" Dfmaaaaaaaaa&ek=1&kp=1&pt=0&bo=kgjqaqaaa "/>

Through the information entropy algorithm, we obtain the audio as well as the video storage boundary information, but found that some of the audio information is huge, can not be separated from the video clearly, resulting in the combination of fragments about 30% of the video is going to spend the screen, so we based on the G711 encoding features, add a second statistical algorithm, According to information entropy and statistic value, two operations are obtained, and more accurate boundary information is gained, the accuracy rate is increased to more than 95%, and the other 5% is done by human.

Then write a combination program to the generated boundary file for video and audio separation and extraction, the smooth completion of the entire work.

650) this.width=650; "height=" 307 "src=" http://a3.qpic.cn/psb?/3f5c8523-1307-46e4-8b77-488d3ae94387/6c3b1ie* 0ziltfh6diz5geachfizwyzrvrxu4zkbvyq!/b/db4aaaaaaaaa&ek=1&kp=1&pt=0&bo=kgi0aqaaaaadadg!&su= 0253543649&sce=0-12-12&rf=2-9 "width=" 553 "style=" Margin:0px;padding:0px;border-width:0px;border-style: none;vertical-align:top; "alt=" Db4aaaaaaaaa&ek=1&kp=1&pt=0&bo=kgi0aqaaa "/>

Recover audio and video files required by customers, 46.9GB

650) this.width=650; "height=" 425 "src=" http://a4.qpic.cn/psb?/3f5c8523-1307-46e4-8b77-488d3ae94387/dymyida5o* 9ymvcxo9jeo1veo8yaicg*vcidezbv9eq!/b/dgmaaaaaaaaa&ek=1&kp=1&pt=0&bo=dagqaqaaaaadaps!&su= 055839649&sce=0-12-12&rf=2-9 "width=" 371 "style=" Margin:0px;padding:0px;border-width:0px;border-style: none;vertical-align:top; "alt=" Dgmaaaaaaaaa&ek=1&kp=1&pt=0&bo=dagqaqaaa "/>

No problem with video file playback, complete degree 100%.

650) this.width=650; "height=" 483 "src=" http://a1.qpic.cn/psb?/3f5c8523-1307-46e4-8b77-488d3ae94387/ ygejvxk2c1p6mofl3jcdas86pj9ltdq1*.9oazxi9ue!/b/dfgaaaaaaaaa&ek=1&kp=1&pt=0&bo=kglkaqaaaaadaog! &su=057584385&sce=0-12-12&rf=2-9 "width=" 553 "style=" margin:0px;padding:0px;border-width:0px; border-style:none;vertical-align:top; "alt=" Dfgaaaaaaaaa&ek=1&kp=1&pt=0&bo=kglkaqaaa "/>

Jia Yu Data Recovery Center: Www.uuhf.net Research and Development products station: www.sysfix.cn

Panasonic P2 card MXF recovery process and ideas