AVC typically means H.264/AVC compression, which is the compression scheme, not the file wrapper, and most real-world videos live inside MP4, MKV, MOV, or TS containers that can hold AVC video plus audio streams, leading people to call an MP4 “an AVC file” even though MP4 is the real file format; when a file literally ends in .avc or .h264/.264, it often represents a raw stream or special-device export that might open in VLC but may have poor seeking, bad duration data, or missing audio because only containers provide indexing and multi-track structure.
Some CCTV/DVR cameras export clips using misleading labels even though the inner format is normal, so simply renaming to .mp4 may solve playback, but some recordings require the vendor’s player to convert; the quickest check is VLC playback plus codec info or a MediaInfo scan to confirm a standard container (MP4/MKV/TS), and if it appears as a raw AVC stream the common fix is to embed it into an MP4 container for compatibility without re-encoding.
A `.mp4` file is almost always a true MP4 *container* holding compressed video plus audio, subtitle tracks, metadata, and seek/timing structure, whereas a `. In the event you cherished this information and also you would want to get more info concerning AVC format kindly pay a visit to our website. avc` file is often merely a raw H.264/AVC stream or vendor-specific output; although playable, it commonly leads to strange initial playback because container elements aren’t present.
This is also why `.avc` files often include no audio: audio is usually stored separately or never bundled with the stream, while MP4 normally packages both video and audio together; additionally, some CCTV/DVR tools export nonstandard extensions, so a file may actually be MP4 or TS but mislabeled as `.avc`, and renaming it to `.mp4` can suddenly make it work, whereas other cases involve proprietary wrappers that need the vendor’s converter; in short, `.mp4` usually means container-structured, while `.avc` often means raw video only, leading to missing audio, weak seeking, and compatibility issues.
Once you figure out what your “AVC file” actually is, the next move depends on whether it’s mislabeled, a raw H.264 stream, or a proprietary CCTV/DVR export; if MediaInfo or VLC reveals it’s in a normal container (e.g., showing “Format: MPEG-4” or behaving like a standard video), the easiest fix is usually renaming the extension—many devices save MP4s but call them `.avc`, and switching `clip.avc` to `clip.mp4` often makes it universally playable (always duplicate the file first); if it turns out to be a raw H.264 stream, usually identified by “Format: AVC” with minimal container details and odd seeking, the typical remedy is to wrap it into MP4 without re-encoding so it gains proper indexing and timing for smooth playback.
If the file originated from a CCTV/DVR or another system using a proprietary wrapper, the most dependable method is running it through the vendor’s export tool to MP4 or AVI, because certain closed formats don’t convert reliably without a proper export; in those cases you’re converting from a special structure to a standard one rather than renaming, and if playback still fails, won’t open, or shows incorrect duration after remuxing, it usually signals corruption or missing sidecar/index files, meaning you must re-export from the source or retrieve the matching metadata.
