From 11bfd84c1aaea3cfb6d8865bfc1aa42fb94015fa Mon Sep 17 00:00:00 2001 From: Mikael Finstad Date: Sat, 23 Sep 2023 12:29:33 +0800 Subject: [PATCH] Update issues.md --- issues.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/issues.md b/issues.md index ba05e1de..f18d4fa9 100644 --- a/issues.md +++ b/issues.md @@ -23,7 +23,7 @@ They have exactly the same in-app features, except for a few platform limitation # Primer / noob guide: Video & audio formats & codecs -Here's a little primer about video and audio formats for those not familiar. A common mistake people have when dealing with audio and video files, is to confuse *formats*, *codecs*, and *file names*. In short: A file's media format is a *container* that holds one or more *codecs* (audio/video/subtitle) inside of it. For example `.mov` is a *container format*, and `H265`/`HEVC` is a *codec*. Some formats support some particular codecs inside of them, while others support other codecs. The most common formats are arguably Matriska (often `.mkv`) and MP4/MOV (often `.mp4`/`.mov`) as well as their derivatives. Example: If you have a file named `My video.mp4`, this file most likely (but not necessarily) has the *format* `MP4`. Note that the extension of a file (in this case `.mp4`) doesn't really mean anything, and the file could in reality for example have the `MOV` format, or the extension could be `.txt`. Inside `My video.mp4` there are multiple tracks/streams, each with their own *codec*. In this example, let's say that it contains one `H264` track and one `AAC` track. In LosslessCut you can view and add/delete/modify these tracks. +Here's a little primer about video and audio formats for those not familiar. A common mistake when dealing with audio and video files, is to confuse *formats*, *codecs*, and *file names*. In short: A file's media format is a *container* that holds one or more *codecs* (audio/video/subtitle) inside of it. For example `.mov` is a *container format*, and `H265`/`HEVC` is a *codec*. Some formats support some particular codecs inside of them, while others support other codecs. The most common formats are arguably Matriska (often `.mkv`) and MP4/MOV (often `.mp4`/`.mov`) as well as their derivatives. Example: If you have a file named `My video.mp4`, this file most likely (but not necessarily) has the *format* `MP4`. Note that the extension of a file (in this case `.mp4`) doesn't really mean anything, and the file could in reality for example have the `MOV` format, or the extension could be `.txt`. Inside `My video.mp4` there are multiple tracks/streams, each with their own *codec*. In this example, let's say that it contains one `H264` track and one `AAC` track. In LosslessCut you can view and add/delete/modify these tracks. **Remuxing**: If you change the output format in LosslessCut and export a file, you are *remuxing* the tracks/codecs into a different container format. When you do this, the operation is in theory lossless, meaning you will not lose any codec data and the different tracks will remain exactly the same, even though the format is now different (but some format metadata might get lost due to incompatibilities between container formats). There are limitations: Some popular codecs like VP8 or VP9 are not supported in popular formats like MP4, and some popular formats like Matroska (`.mkv`) are not natively supported in popular video players like iPhone or QuickTime.