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[http://www.shop263.com/i-48/649.htm 分子生物学产品]
 
[http://www.shop263.com/i-48/650.htm 分子蒸馏]
 
[http://www.shop263.com/i-48/651.htm 粉末涂料生产成套设备]
 
[http://www.shop263.com/i-48/652.htm 粉末涂装设备]
 
[http://www.shop263.com/i-48/653.htm 粉碎机]
 
[http://www.shop263.com/i-48/654.htm 粉体表面改性机械]
 
[http://www.shop263.com/i-48/655.htm 粉体混合工程设备]
 
[http://www.shop263.com/i-48/656.htm 风冷式热油泵]
 
[http://www.shop263.com/i-48/657.htm 氟表面活性剂]
 
[http://www.shop263.com/i-48/658.htm 氟合金液下泵]
 
[http://www.shop263.com/i-48/659.htm 氟化铵]
 
[http://www.shop263.com/i-48/660.htm 氟化氢铵]
 
[http://www.shop263.com/i-48/661.htm 氟树脂]
 
[http://www.shop263.com/i-48/662.htm 氟塑料衬里泵]
 
[http://www.shop263.com/i-48/663.htm 氟塑料衬里阀门]
 
[http://www.shop263.com/i-48/664.htm 氟塑料衬里隔膜阀]
 
[http://www.shop263.com/i-48/665.htm 氟塑料衬里截止阀]
 
[http://www.shop263.com/i-48/666.htm 氟塑料衬里球阀]
 
[http://www.shop263.com/i-48/667.htm 氟塑料衬里旋塞阀]
 
[http://www.shop263.com/i-48/668.htm 氟塑料衬里止回阀]
 
[http://www.shop263.com/i-48/669.htm 氟塑料合金材料]
 
[http://www.shop263.com/i-48/670.htm 氟塑料合金液下泵]
 
[http://www.shop263.com/i-48/671.htm 氟塑料喷涂]
 
[http://www.shop263.com/i-48/672.htm 氟塑料增强合金泵]
 
[http://www.shop263.com/i-48/673.htm 浮水泵]
 
[http://www.shop263.com/i-48/674.htm 浮头列管式石墨换热器]
 
[http://www.shop263.com/i-48/675.htm 釜外循环系统设置]
 
[http://www.shop263.com/i-48/676.htm 复合机]
 
[http://www.shop263.com/i-48/677.htm 复合喷丝板]
 
[http://www.shop263.com/i-48/678.htm 复合橡胶板]
 
[http://www.shop263.com/i-48/679.htm 干湿纺喷丝头]
 
[http://www.shop263.com/i-48/680.htm 干式真空泵]
 
[http://www.shop263.com/i-48/681.htm 干燥机]
 
[http://www.shop263.com/i-48/682.htm 干燥器]
 
[http://www.shop263.com/i-48/683.htm 干燥设备]
 
[http://www.shop263.com/i-48/684.htm 甘油]
 
[http://www.shop263.com/i-48/685.htm 钢衬复合管]
 
[http://www.shop263.com/i-48/686.htm 钢衬聚乙烯管道]
 
[http://www.shop263.com/i-48/687.htm 钢衬塑管道]
 
[http://www.shop263.com/i-48/688.htm 钢筘]
 
[http://www.shop263.com/i-48/689.htm 钢瓶]
 
[http://www.shop263.com/i-48/690.htm 钢丝缠绕胶管]
 
[http://www.shop263.com/i-48/691.htm 钢丝螺套]
 
[http://www.shop263.com/i-48/692.htm 钢塑复合管]
 
[http://www.shop263.com/i-48/693.htm 钢质焊接气瓶]
 
[http://www.shop263.com/i-48/694.htm 高纯化学品酸]
 
[http://www.shop263.com/i-48/695.htm 高档挤出复合机]
 
[http://www.shop263.com/i-48/696.htm 高档塑料制品]
 
[http://www.shop263.com/i-48/697.htm 高低密度聚乙烯]
 
[http://www.shop263.com/i-48/698.htm 高低压空温式汽化器]
 
[http://www.shop263.com/i-48/699.htm 高剪刀混合乳化机]
 
[http://www.shop263.com/i-48/700.htm 高剪切乳化设备]
 
[http://www.shop263.com/i-48/701.htm 高精度金属丝]
 
[http://www.shop263.com/i-48/702.htm 高岭土]
 
[http://www.shop263.com/i-48/703.htm 高频塑料热合机]
 
[http://www.shop263.com/i-48/704.htm 高强度聚乙稀PE储运罐]
 
[http://www.shop263.com/i-48/705.htm 高速分散机]
 
[http://www.shop263.com/i-48/706.htm 高速离心喷雾干燥机]
 
[http://www.shop263.com/i-48/707.htm 高速离心造粒干燥机]
 
[http://www.shop263.com/i-48/708.htm 高速升降搅拌机]
 
[http://www.shop263.com/i-48/709.htm 高速枕式全自动包装机]
 
[http://www.shop263.com/i-48/710.htm 高速制管机]
 
[http://www.shop263.com/i-48/711.htm 高温泵]
 
[http://www.shop263.com/i-48/712.htm 高温耐腐蚀离心泵]
 
[http://www.shop263.com/i-48/713.htm 高温液下泵]
 
[http://www.shop263.com/i-48/714.htm 高效板式密闭过滤机]
 
[http://www.shop263.com/i-48/715.htm 高效多管除尘器]
 
[http://www.shop263.com/i-48/716.htm 高效沸腾干燥机]
 
[http://www.shop263.com/i-48/717.htm 高效粉碎机]
 
[http://www.shop263.com/i-48/718.htm 高效过滤器]
 
[http://www.shop263.com/i-48/719.htm 高效换热器]
 
[http://www.shop263.com/i-48/720.htm 高效活性聚合物驱油剂]
 
[http://www.shop263.com/i-48/721.htm 高效节能聚四氟乙烯离心泵]
 
[http://www.shop263.com/i-48/722.htm 高效四氟换热器]
 
[http://www.shop263.com/i-48/723.htm 高效细粉分离器]
 
[http://www.shop263.com/i-48/724.htm 高压泵]
 
[http://www.shop263.com/i-48/725.htm 高压反应釜]
 
[http://www.shop263.com/i-48/726.htm 高压胶管]
 
[http://www.shop263.com/i-48/727.htm 高压静电除尘器]
 
[http://www.shop263.com/i-48/728.htm 高压绝缘子]
 
[http://www.shop263.com/i-48/729.htm 高压清洗机]
 
[http://www.shop263.com/i-48/730.htm 高压探测器]
 
[http://www.shop263.com/i-48/731.htm 高压无缝钢瓶]
 
[http://www.shop263.com/i-48/732.htm 高真空连续分离成套装置]
 
[http://www.shop263.com/i-48/733.htm 隔膜泵]
 
[http://www.shop263.com/i-48/734.htm 隔直流电容器]
 
[http://www.shop263.com/i-48/735.htm 各类塔器]
 
[http://www.shop263.com/i-48/736.htm 给排水泵]
 
[http://www.shop263.com/i-48/737.htm 工程爆破]
 
[http://www.shop263.com/i-48/738.htm 工程塑料泵]
 
[http://www.shop263.com/i-48/739.htm 工程塑料阀门]
 
[http://www.shop263.com/i-48/740.htm 工程陶瓷]
 
[http://www.shop263.com/i-48/741.htm 工程液压设备]
 
[http://www.shop263.com/i-48/742.htm 工民建筑]
 
[http://www.shop263.com/i-48/743.htm 工业泵]
 
[http://www.shop263.com/i-48/744.htm 工业除尘]
 
[http://www.shop263.com/i-48/745.htm 工业阀门]
 
[http://www.shop263.com/i-48/746.htm 工业锅炉]
 
[http://www.shop263.com/i-48/747.htm 工业级磷酸一铵]
 
[http://www.shop263.com/i-48/748.htm 工业加湿机]
 
[http://www.shop263.com/i-48/749.htm 工业冷水机]
 
[http://www.shop263.com/i-48/750.htm 工业炉]
 
[http://www.shop263.com/i-48/751.htm 工业热风炉]
 
[http://www.shop263.com/i-48/752.htm 工业消耗品]
 
[http://www.shop263.com/i-48/753.htm 工业氧气]
 
[http://www.shop263.com/i-48/754.htm 工业用离心泵]
 
[http://www.shop263.com/i-48/755.htm 工业噪音治理]
 
[http://www.shop263.com/i-48/756.htm 工艺蜡烛]
 
[http://www.shop263.com/i-48/757.htm 工作梯]
 
[http://www.shop263.com/i-48/758.htm 供氧装置]
 
[http://www.shop263.com/i-48/759.htm 固定式沸腾床干燥机]
 
[http://www.shop263.com/i-48/760.htm 固定箱体式调速型液力偶合器]
 
[http://www.shop263.com/i-48/761.htm 刮板薄膜蒸发器喷雾干燥机]
 
[http://www.shop263.com/i-48/762.htm 刮板式薄膜蒸发器]
 
[http://www.shop263.com/i-48/763.htm 刮刀下卸料离心机]
 
[http://www.shop263.com/i-48/764.htm 观片灯]
 
[http://www.shop263.com/i-48/765.htm 观片灯X射线胶片]
 
[http://www.shop263.com/i-48/766.htm 管道]
 
[http://www.shop263.com/i-48/767.htm 管道泵]
 
[http://www.shop263.com/i-48/768.htm 管道附件]
 
[http://www.shop263.com/i-48/769.htm 管道过滤器]
 
[http://www.shop263.com/i-48/770.htm 管道配件]
 
[http://www.shop263.com/i-48/771.htm 管道式无堵塞排污泵]
 
[http://www.shop263.com/i-48/772.htm 管道式自动增压泵]
 
[http://www.shop263.com/i-48/773.htm 管道特殊件]
 
[http://www.shop263.com/i-48/774.htm 管件]
 
[http://www.shop263.com/i-48/775.htm 管配件]
 
[http://www.shop263.com/i-48/776.htm 管式热交换器]
 
[http://www.shop263.com/i-48/777.htm 管束干燥机]
 
[http://www.shop263.com/i-48/778.htm 灌装机械]
 
[http://www.shop263.com/i-48/779.htm 罐内封闭阀门]
 
[http://www.shop263.com/i-48/780.htm 硅胶]
 
[http://www.shop263.com/i-48/781.htm 硅藻土精滤机]
 
[http://www.shop263.com/i-48/782.htm 癸二酸铵]
 
[http://www.shop263.com/i-48/783.htm 辊式破碎机]
 
[http://www.shop263.com/i-48/784.htm 辊式压力机]
 
[http://www.shop263.com/i-48/785.htm 滚滴浸绝缘处理设备]
 
[http://www.shop263.com/i-48/786.htm 滚筒干燥机]
 
[http://www.shop263.com/i-48/787.htm 滚筒干燥器]
 
[http://www.shop263.com/i-48/788.htm 锅炉]
 
[http://www.shop263.com/i-48/789.htm 国标储气桶]
 
[http://www.shop263.com/i-48/790.htm 过滤分离设备]
 
[http://www.shop263.com/i-48/791.htm 过滤机]
 
[http://www.shop263.com/i-48/792.htm 过滤器]
 
[http://www.shop263.com/i-48/793.htm 过滤器材设备]
 
[http://www.shop263.com/i-48/794.htm 过滤网]
 
[http://www.shop263.com/i-48/795.htm 含氮化合物]
 
[http://www.shop263.com/i-48/796.htm 含氟农药产品]
 
[http://www.shop263.com/i-48/797.htm 含氟新农药]
 
[http://www.shop263.com/i-48/798.htm 焊管]
 
[http://www.shop263.com/i-48/799.htm 焊管生产线]
 
[http://www.shop263.com/i-48/800.htm 焊接绝热气瓶]
 
[http://www.shop263.com/i-48/801.htm 合成氨]
 
[http://www.shop263.com/i-48/802.htm 黑液提取设备]
 
[http://www.shop263.com/i-48/803.htm 恒压变量自动给水控制设备]
 
[http://www.shop263.com/i-48/804.htm 喉管]
 
[http://www.shop263.com/i-48/805.htm 后整理设备]
 
[http://www.shop263.com/i-48/806.htm 呼吸阀]
 
[http://www.shop263.com/i-48/807.htm 呼吸人孔]
 
[http://www.shop263.com/i-48/808.htm 护栏网]
 
[http://www.shop263.com/i-48/809.htm 滑阀真空泵]
 
[http://www.shop263.com/i-48/800.htm 滑片式管道泵]
 
[http://www.shop263.com/i-48/811.htm 化成箔]
 
[http://www.shop263.com/i-48/812.htm 化工泵]
 
[http://www.shop263.com/i-48/813.htm 化工泵阀]
 
[http://www.shop263.com/i-48/814.htm 化工反应釜]
 
[http://www.shop263.com/i-48/815.htm 化工防腐]
 
[http://www.shop263.com/i-48/816.htm 化工防腐成套设备]
 
[http://www.shop263.com/i-48/817.htm 化工管道]
 
[http://www.shop263.com/i-48/818.htm 化工机械]
 
[http://www.shop263.com/i-48/819.htm 化工离心泵]
 
[http://www.shop263.com/i-48/820.htm 化工设备]
 
[http://www.shop263.com/i-48/821.htm 化工试剂]
 
[http://www.shop263.com/i-48/822.htm 化工行业筛分机]
 
[http://www.shop263.com/i-48/823.htm 化工液体]
 
[http://www.shop263.com/i-48/824.htm 化纤备件]
 
[http://www.shop263.com/i-48/825.htm 化纤纺丝配件]
 
[http://www.shop263.com/i-48/826.htm 化纤专件]
 
[http://www.shop263.com/i-48/827.htm 化学加药装置]
 
[http://www.shop263.com/i-48/828.htm 化学纤维]
 
[http://www.shop263.com/i-48/829.htm 化妆品]
 
[http://www.shop263.com/i-48/830.htm 环保工业用途的真空系统]
 
[http://www.shop263.com/i-48/831.htm 环保三废治理设备]
 
[http://www.shop263.com/i-48/832.htm 环保脱硫除尘设备]
 
[http://www.shop263.com/i-48/833.htm 环保型热熔胶]
 
[http://www.shop263.com/i-48/834.htm 环保用品]
 
[http://www.shop263.com/i-48/835.htm 环氧树脂真空浇注设备]
 
[http://www.shop263.com/i-48/836.htm 缓蚀剂]
 
[http://www.shop263.com/i-48/837.htm 换热]
 
[http://www.shop263.com/i-48/838.htm 换热器]
 
[http://www.shop263.com/i-48/839.htm 换热容器]
 
[http://www.shop263.com/i-48/840.htm 换热设备]
 
[http://www.shop263.com/i-48/841.htm 磺化设备]
 
[http://www.shop263.com/i-48/842.htm 回收净化]
 
[http://www.shop263.com/i-48/843.htm 混合机]
 
[http://www.shop263.com/i-48/844.htm 混料机]
 
[http://www.shop263.com/i-48/845.htm 混流式喷雾干燥机]
 
[http://www.shop263.com/i-48/846.htm 活塞推料离心机]
 
[http://www.shop263.com/i-48/847.htm 活性磷酸钙]
 
[http://www.shop263.com/i-48/848.htm 活性炭]
 
[http://www.shop263.com/i-48/849.htm 活性炭过滤器]
 
[http://www.shop263.com/i-48/850.htm 活性碳过滤网]
 
[http://www.shop263.com/i-48/851.htm 活性碳口罩]
 
[http://www.shop263.com/i-48/852.htm 活性碳酸钙]
 
[http://www.shop263.com/i-48/853.htm 活性氧化铝]
 
[http://www.shop263.com/i-48/854.htm 活性氧化铝球]
 
[http://www.shop263.com/i-48/855.htm 火灾逃生面具]
 
[http://www.shop263.com/i-48/856.htm 机械粉碎机]
 
[http://www.shop263.com/i-48/857.htm 机械过滤器]
 
[http://www.shop263.com/i-48/858.htm 机械密封件]
 
[http://www.shop263.com/i-48/859.htm 机械式单缸热熔釜]
 
[http://www.shop263.com/i-48/860.htm 机械式双缸热熔釜]
 
[http://www.shop263.com/i-48/861.htm 机械式无级变速器]
 
[http://www.shop263.com/i-48/862.htm 基因扩增仪]
 
[http://www.shop263.com/i-48/863.htm 集智能阀门]
 
[http://www.shop263.com/i-48/864.htm 己二酸]
 
[http://www.shop263.com/i-48/865.htm 挤出机]
 
[http://www.shop263.com/i-48/866.htm 挤水机]
 
[http://www.shop263.com/i-48/867.htm 挤压机]
 
[http://www.shop263.com/i-48/868.htm 计量泵]
 
[http://www.shop263.com/i-48/869.htm 加弹机]
 
[http://www.shop263.com/i-48/870.htm 加氢脱氧纯化装置]
 
[http://www.shop263.com/i-48/871.htm 加压叶滤机]
 
[http://www.shop263.com/i-48/872.htm 甲醇]
 
[http://www.shop263.com/i-48/873.htm 甲醇催化剂]
 
[http://www.shop263.com/i-48/874.htm 甲醇废水回收甲醇装置]
 
[http://www.shop263.com/i-48/875.htm 甲醇重整制氢装置]
 
[http://www.shop263.com/i-48/876.htm 甲醛]
 
[http://www.shop263.com/i-48/877.htm 甲醛尾气废热锅炉]
 
[http://www.shop263.com/i-48/878.htm 甲酸铵]
 
[http://www.shop263.com/i-48/879.htm 钾盐]
 
[http://www.shop263.com/i-48/880.htm 尖嘴式造粒机]
 
[http://www.shop263.com/i-48/881.htm 减速器]
 
[http://www.shop263.com/i-48/882.htm 剪板机]
 
[http://www.shop263.com/i-48/883.htm 检漏仪]
 
[http://www.shop263.com/i-48/884.htm 碱回收苛化工段成套设备]
 
[http://www.shop263.com/i-48/885.htm 建材机械]
 
[http://www.shop263.com/i-48/886.htm 剑杆织机]
 
[http://www.shop263.com/i-48/887.htm 浆叶干燥机]
 
[http://www.shop263.com/i-48/888.htm 降膜式吸收器]
 
[http://www.shop263.com/i-48/889.htm 降膜吸收器]
 
[http://www.shop263.com/i-48/890.htm 降膜蒸发器]
 
[http://www.shop263.com/i-48/891.htm 降凝干加剂]
 
[http://www.shop263.com/i-48/892.htm 胶带机]
 
[http://www.shop263.com/i-48/893.htm 胶囊填充设备]
 
[http://www.shop263.com/i-48/894.htm 胶体磨]
 
[http://www.shop263.com/i-48/895.htm 胶粘剂]
 
[http://www.shop263.com/i-48/896.htm 搅拌机]
 
[http://www.shop263.com/i-48/897.htm 搅拌容器]
 
[http://www.shop263.com/i-48/898.htm 酵母]
 
[http://www.shop263.com/i-48/899.htm 接地]
 
[http://www.shop263.com/i-48/900.htm 接口波纹管]
 
[http://www.shop263.com/i-48/901.htm 接头]
 
[http://www.shop263.com/i-48/902.htm 节能浓缩器]
 
[http://www.shop263.com/i-48/903.htm 洁净地漏]
 
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[http://www.shop263.com/i-48/1208.htm 热端在线测厚仪]
 
[http://www.shop263.com/i-48/1209.htm 热风炉]
 
[http://www.shop263.com/i-48/1210.htm 热风循环烘箱]
 
[http://www.shop263.com/i-48/1211.htm 热交换器]
 
[http://www.shop263.com/i-48/1212.htm 热熔压敏胶]
 
[http://www.shop263.com/i-48/1213.htm 热收缩包装机]
 
[http://www.shop263.com/i-48/1214.htm 热收缩机]
 
[http://www.shop263.com/i-48/1215.htm 热水式压力杀菌机]
 
[http://www.shop263.com/i-48/1216.htm 热油泵]
 
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[http://www.shop263.com/i-48/1218.htm 日用化工]
 
[http://www.shop263.com/i-48/1219.htm 容积式泵]
 
[http://www.shop263.com/i-48/1220.htm 溶媒]
 
[http://www.shop263.com/i-48/1221.htm 溶体过滤器]
 
[http://www.shop263.com/i-48/1222.htm 熔硫釜]
 
[http://www.shop263.com/i-48/1223.htm 熔融纺圆孔喷丝板]
 
[http://www.shop263.com/i-48/1224.htm 熔体过滤芯]
 
[http://www.shop263.com/i-48/1225.htm 肉碱]
 
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[http://www.shop263.com/i-48/1232.htm 三物料颗粒包装机]
 
[http://www.shop263.com/i-48/1233.htm 三叶罗茨鼓风机]
 
[http://www.shop263.com/i-48/1234.htm 三足上卸料离心机]
 
[http://www.shop263.com/i-48/1235.htm 三足式刮刀下卸料离心机]
 
[http://www.shop263.com/i-48/1236.htm 三足式机械刮刀下部卸料离心机]
 
[http://www.shop263.com/i-48/1237.htm 三足式离心机]
 
[http://www.shop263.com/i-48/1238.htm 三足式手动刮刀下部卸料离心机]
 
[http://www.shop263.com/i-48/1239.htm 散热器]
 
[http://www.shop263.com/i-48/1240.htm 扫仓泵]
 
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[http://www.shop263.com/i-48/1260.htm 改性玻纤增强聚丙烯列管换热器]
 
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[http://www.shop263.com/i-48/1265.htm 石墨聚丙烯列管式换热器]
 
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[http://www.shop263.com/i-48/1267.htm 石墨泡罩塔]
 
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[http://www.shop263.com/i-48/1269.htm 石墨盐酸合成炉]
 
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[http://www.shop263.com/i-48/1274.htm 直流微型循环增压泵]
 
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[http://www.shop263.com/i-48/1278.htm 止回阀]
 
[http://www.shop263.com/i-48/1279.htm 纸餐具机械]
 
[http://www.shop263.com/i-48/1280.htm 纸张包装设备]
 
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[http://www.shop263.com/i-48/1283.htm 制氮机]
 
[http://www.shop263.com/i-48/1284.htm 制管机]
 
[http://www.shop263.com/i-48/1285.htm 制氢设备]
 
[http://www.shop263.com/i-48/1286.htm 制砂机]
 
[http://www.shop263.com/i-48/1287.htm 制鞋胶粘剂]
 
[http://www.shop263.com/i-48/1288.htm 制氧机]
 
[http://www.shop263.com/i-48/1289.htm 制药]
 
[http://www.shop263.com/i-48/1290.htm 智能型卧式结晶机]
 
[http://www.shop263.com/i-48/1291.htm 智能自控多效蒸馏水机]
 
[http://www.shop263.com/i-48/1292.htm 中草药]
 
[http://www.shop263.com/i-48/1293.htm 中高压风机]
 
[http://www.shop263.com/i-48/1294.htm 中频磁控溅射镀膜机]
 
[http://www.shop263.com/i-48/1295.htm 中速聚氨酯发泡机]
 
[http://www.shop263.com/i-48/1296.htm 中效空气过滤器]
 
[http://www.shop263.com/i-48/1297.htm 中央真空系统及排气机组]
 
[http://www.shop263.com/i-48/1298.htm 中药提取生产线系列设备]
 
[http://www.shop263.com/i-48/1299.htm 种真空阀门]
 
[http://www.shop263.com/i-48/1300.htm 种子罐]
 
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Revision as of 23:33, 28 October 2004

Introduction

Ogg Writ is a text phrase codec. While its primary purpose is to embed subtitles or captions in a Theora stream, its design makes it useful for many other purposes. It could provide lyrics to song encoded in Vorbis, a transcript to a political debate encoded in Speex, or even incorporate a live chat session as part of a continuous video stream.

One of the unique aspects of Writ is its discontinuous nature, that is, unlike other Ogg codecs the granules for which seperate packets effect may overlap. See the Granules and Muxing section below for how this works.


SVN

Current Ogg Writ development is on Xiph SVN as /trunk/writ/. It's being developed to use libogg2, so you'll need both to work on it. The reference encoder and decoder are available as part of the py-ogg2 package which is available on Xiph SVN as /trunk/py-ogg2/.


This is a (near final) working draft of the spec
Writ has been designed so that encoders/decoders can support a bare minimum and be fully compatable with future subversions. Each subversion adds a new feature, some building on others, adding a new header packet and likely a new field to each body packet.

Decoders should ignore header packets beyond what they were written to support and also ignore extra fields in data packets beyond their current version. This allows new features to be added without requiring that all software, or even most software, to support them. <P> We will be conservative about adding future subversions.

Header Packet 0 (BOS, 16 bytes):
 0x00                                   ( 8 bit Header 0)
 "writ" (LSB 0x74697277)                (32 bit codec identification)
 version                                ( 8 bit unsigned int, 0 = Alpha)
 subversion                             ( 8 bit unsigned int)
 granulerate_numerator                  (32 bit unsigned int)
 granulerate_denominator                (32 bit unsigned int)

Data Packet (each):
 0xFF                                   ( 8 bit 0xFF = data packet)
 granule_start                          (64 bit signed integer)
 granule_duration                       (32 bit unsigned integer)
 text_length                            ( 8 bit unsigned integer)
 text_string                            (variable-length UTF-8 string)


<B>Subversion 1 adds multiple language support</B>

Header Packet 1 (Language Definition, 8+ bytes) :
 0x01                                   ( 8 bit Header 1)
 "writ" (LSB 0x74697277)                (32 bit codec identification)
 num_languages                          ( 8 bit unsigned int)
 [repeated 1+num_languages times] :
   language_length                      ( 8 bit unsigned int)
   language_string                      (0+language_length rfc3066)
   language_desc_length                 ( 8 bit unsigned int)
   language_desc_string                 (0+language_desc_length UTF-8)

Data Packet (each):
 0xFF                                   ( 8 bit 0xFF = data packet)
 granule_start                          (64 bit signed integer)
 granule_duration                       (32 bit unsigned integer)
 [repeated num_languages times] :
   text_length                          ( 8 bit unsigned integer)
   text_string                          (variable-length UTF-8 string)


<B>Subversion 2 adds text window support</B>

Header Packet 2 (Window Definition, 10+ bytes) :
 0x02                                   ( 8 bit Header 2)
 "writ" (LSB 0x74697277)                (32 bit codec identification)
 location_scale_x                       (16 bit unsigned int)
 location_scale_y                       (16 bit unsigned int)
 num_windows                            ( 8 bit unsigned int)
 [if (window_num > 0) repeated window_num times] :
   location_x                           (variable length, see below)
   location_y                           (variable length, see below)
   location_width                       (variable length, see below)
   location_height                      (variable length, see below)
   alignment_x                          ( 2 bit alignment, see below)
   alignment_y                          ( 2 bit alignment, see below)

Data Packet (each):
 0xFF                                   ( 8 bit 0xFF = data packet)
 granule_start                          (64 bit signed integer)
 granule_duration                       (32 bit unsigned integer)
 [repeated num_languages times] :
   text_length                          ( 8 bit unsigned integer)
   text_string                          (variable-length UTF-8 string)
 [if (window_num > 1)] :
   window_id                            ( 8 bit unsigned integer)


<B>Example Stream</B>
 Header Packet 0
  version 0
  subversion 2
  granulenum 1
  granuledom 1
 \x00writ\x00\x02\x01\x00\x00\x00\x01\x00\x00\x00

 Header Packet 1
  num_languages 2
   Language 0:
    language en
    language_desc English
   Language 1:
    language es
    language_desc Spanish
 \x01writ\x01\x02en\x07English\x02es\x07Spanish

 Header Packet 2
  location_scale_x 4000 (12 bits)
  location_scale_y 270  ( 9 bits)
  num_windows 2
   Window 0:
    location_x 1
    location_y 2
    location_width 3
    location_height 1
    alignment_x 3 (Full)
    alignment_y 3 (Full)
   Window 1:
    location_x 5
    location_y 6
    location_width 7
    location_height 1
    alignment_x 3 (Full)
    alignment_y 3 (Full)
 \x02writ\xa0\x0f\x0e\x01\x02\x01\x20\x60\x00\x02\x7c\x01\x18\x38\x80\x00\x0f

 Phrase Packet:
  granule_start 5
  granule_duration 10
  Language 0: "Hello World!"
  Language 1: "Hola, Mundo!"
  window_id 0
 \xff\x05\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x0cHello World!\x0cHola, Mundo!\x00

 Phrase Packet:
  granule_start 12
  granule_duration 15
  Language 0: "It's a beautiful day to be born."
  Language 1: "Es un día hermoso para que se llevará."
  window_id 1
 \xff\x0c\x00\x00\x00\x00\x00\x00\x00\x0f\x00\x00\x00\x20It's a beautiful day to be born.\x26Es un d\xeda hermoso para que se llevar\xe1.\x01


Granules and Muxing

Granulepos in Writ (as well as future discontinuous codecs) will be by start time, not end time, that the data in a given page is tagged for. This greatly simplifies this specification (see the old method below).

All Writ phrases will be provided at and given the granulepos of their start time, ordered by their start time within the logical bitstream.

Phrase packets with long durations should be repeated in the logical bitstream at regular intervals to ensure that a player seeking to the middle of their duration will still see them. These packet copies will be identical to their original, including the start and duration fields, the granulepos of the page they reside on will be incremented for each copy to place it forward on the logical bitstream.

No two phrases can start on the same granule. On decoding, each packets' start granule is checked against already known packets. If a match is found the new packet is ignored. This prevents phrase copies from being interpreted as new phrases.

Seeking Example


Here is a timeline (granule numbers at top, read down) of a sample stream:

                        <- Granules ->
0000000000111111111122222222223333333333444444444455555555556666666666
0123456789012345678901234567890123456789012345678901234567890123456789
 ___________  ____________  ____________  ____________  _____________
|_Vorbis____||_Vorbis_____||_Vorbis_____||_Vorbis_____||_Vorbis______|
 ____________________   ____________________________________
|_A____________>_____| |_D____________>______________>______|
     _________      ___    __________     ___________
    |_B_______|    |_C_|  |_E________|   |_F_________|

 (note: these have been seperated vertically for easy viewing only)

Packet  Granule Description
 V H0   0       Vorbis Header 0x01 (page by itself)
 W H0   0       Writ Header 0 (page by itself)
 V H1   0       Vorbis Header 0x03
 V H2   0       Vorbis Header 0x05
 W H1   0       Writ Header 1 (Language Defs)
 W H2   0       Writ Header 2 (Window Defs)
 W A    0       Writ Phrase A
 W B    4       Writ Phrase B
 V      12      Vorbis 0-12
 W A    15      Writ Phrase A
 W C    19      Writ Phrase C
 W D    23      Writ Phrase D
 V      26      Vorbis 13-26
 W E    26      Writ Phrase E
 W D    38      Writ Phrase D
 V      40      Vorbis 27-40
 W F    41      Writ Phrase F
 W D    53      Writ Phrase D (EOF)
 V      54      Vorbis 41-54
 V      69      Vorbis 55-69 (EOF)

Player begins decoding at beginning of stream. It reads the BOS pages for both codecs, then receives a non-BOS page. At this point it knows that it has two bitstreams to decode and has resolved that one is Writ and the other Vorbis. It'll continue processing the headers for both.

Next it's going to find two Writ packets (phrases A and B) and toss them into libwrit. Then it'll get to the first Vorbis data page. It now has data from both bitstreams, and it knows (from the granulepos on the Vorbis page) that it has enough data to run until 12. If there were any Writ packets before 12 they would have appeared first.

At around granule 9 the listener seeks forward to 24. This will cause a rapid seek through the file to find the first page with a granulepos greater than the seek position and begin decoding at that point.

It'll find a Vorbis packet containing 13-26 (and not use 13-23) and Writ phrase E. Again, having data from both bitstreams it can begin playing. D would normally appear at granule 24 but is not known about yet. The player knows that this is only enough to decode until 26 so, knowing enough to prebuffer, continues reading the file as it plays the media.

The next packet it finds is Writ phrase D, and passing it to libwrit, is found that the current granulepos is within the duration. It is thus displayed immediatly, as it's prebuffered, without waiting for granulepos 38. It'll keep reading (because the maximum decoded Vorbis is still 26) and find a Vorbis packet with a 40 granulepos.

As it nears 38 it'll read the file again and find Writ phrase F, which takes it out to 41. Vorbis only goes until 40, so it'll have to keep reading until the next Vorbis packet.

Next it'll find Writ phrase D, which will be ignored by libwrit because phrase D is already known (matches start granule of earlier D), and the EOF on that page marks this as the last of the Writ stream.

It'll continue reading for the next Vorbis data and find the packet for granule 54, followed by the Vorbis packet for granule 69. With that it's EOS, EOF, finished.

This is of course a simplistic example, Writ and Vorbis will rarely have granules which equal the same amount of time. Each bitstream has its' own granule -> time mapping which is calculated when muxing concurrent bitstreams within the file. So if there are 44100 Vorbis granules per second and only 4 Writ granules per second, pages would be ordered as W25 V297892 W31 V385932 W39 W41 V463057 etc. The logic used in the above example works after this granule-time mapping is calculated.


Ongoing Discussion

  • How does this get "encoded" and "merged"?
    • <purple_haese> The muxing rule is pages are arranged in ascending order by the timestamp that is represented by their granulepos.
  • For what reason is the 0x00 and 0xFF byte at the beginning of header and data packet respectively?
    • <xiphmont> If, after a seek, I hand your codec a header packet, what does the codec do?
    • <xiphmont> It does *nothing*. If I haven't told it to reset, the header is not data, *it must ignore the header*.
    • <xiphmont> this eliminates a huge raft of special cases in Ogg seeking.


"The Old Way"

The section below is for historical purposes only!

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2003/08/17
  In a lengthy discussion with Monty and Derf the decidion to change the
  behavior of discontinuous bitstreams in Ogg, or rather, extend the
  current Ogg specification to handle discontinuous codecs, was made.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

The Ogg granulepos of each page is equal to the expiration of the text, packets are ordered by expiration time and may overlap. So, at or before text A is to be displayed, the following sequence is included:

Physical        Text    Text    Text
Location        Packet  Start   Expire  (text expire = page granulepos)
---------------------------------------
00              B       04      14
00              D       19      23
00              C       09      24
00              F       27      34
00              E       26      37
00              G       35      47
00              H       42      54
00              A       00      59
51              I       51      66

So B, D, C, F, E, G, and H are all defined before A, building a FIFO (first in first out) buffer in the player. Encoders should limit the extend of this behavior to reduce nessesary buffer size on the player side by prematurly expiring captions and recreating them periodically.

The screen should not be updated with the new captions until they've all been processed to prevent "flicker". New caption data to the same position will scroll the previous data upwards with no line breaks seperating them

(unless present in text).