JPEG encoded data in a PNG container; in both cases however, the different formats have different magic numbers – the format specifies the coding, though a MNG can contain both PNG-encoded images and JPEG-encoded images. Multimedia container formats The container file is used to identify and interleave different data types. Simpler container formats can contain different types of audio formats, while more advanced container formats can support multiple audio and video streams, subtitles, chapter-information, and meta-data (tags) — along with the synchronization information needed to play back the various streams together. In most cases, the file header, most of the metadata and the synchro chunks are specified by the container format. For example, container formats exist for optimized, low-quality, internet video streaming which differs from high-quality Blu-ray streaming requirements. Container format parts have various names: "chunks" as in RIFF and PNG, "atoms" in QuickTime/MP4, "packets" in MPEG-TS (from the communications term), and "segments" in JPEG. The main content of a chunk is called the "data" or "payload". Most container formats have chunks in sequence, each with a header, while TIFF instead stores offsets. Modular chunks make it easy to recover other chunks in case of file corruption or dropped frames or bit slip, while offsets result in framing errors in cases of bit slip. Some containers are exclusive to audio: AIFF (IFF file format, widely used on Mac OS platform) WAV (RIFF file format, widely used on Windows platform) XMF (Extensible Music Format) Other containers are exclusive to still images: FITS (Flexible Image Transport System) still images, raw data, and associated metadata. TIFF (Tagged Image File Format) still images and associated metadata. Macintosh PICT resource (PICT), superseded by PDF in Mac OS X Windows Metafile (WMF) = (EMF) Enhanced Metafile Encapsulated PostScript (EPS) Computer Graphics Metafile (CGM) Portable Document Format (PDF) Corel Draw File (CDR) Scalable Vector Graphics (SVG) Rich Text Format file (RTF) Other flexible containers can hold many types of audio and video, as well as other media. The most popular multi-media containers are: 3GP (used by many mobile phones; based on the ISO base media file format) ASF (container for Microsoft WMA and WMV, which today usually do not use a container) AVI (the standard Microsoft Windows container, also based on RIFF) DVR-MS ("Microsoft Digital Video Recording", proprietary video container format developed by Microsoft based on ASF) Flash Video (FLV, F4V) (container for video and audio from