- 1. Introduction
2. Available Filter
- 1.1. Filter capabilities
- 1.2. Development
- 2.1. Audio Filter
- 2.2. Audio and Video Filter
- 2.3. Video Filter
Transcode supports filter plugins to do additional processing of video frames and audio.
See Transcode internals/Processing Order for information about the processing order of filter plugins and Transcodes internal processing functions.
1.1. Filter capabilities
This is an example of a capabilities table used in the filter descriptions below
| Video || Audio || RGB || YUV || YUV422 || multiple instances || processing type || frames needed |
| yes || no || yes || yes || no || yes || PRE/POST || 1 |
- Video This filter handles video frames
- This filter can process video frames.
- Audio This filter handles audio
- This filter can process audio.
- RGB Works with video frames in the RGB colorspace
- To use RGB? as internal colorspace? for transcode append --use_rgb to your transcode commandline.
- YUV Works with video frames in the YUV colorspace
- YUV? is the default internal colorspace of transcode.
- YUV422 Works with video frames in the YUV422 colorspace
- To use YUV422? as internal colorspace for transcode append --uyvy to your transcode commandline.
- multiple instances One can start several independent instances of the filter
- Some filters can be called more than one time and do it's processing indepentent from each other (e.g. the logoaway filter). For other filters, like deinterlacing, this makes no sense.
- processing type A filter can be a PRE, POST, or PRE/POST filter
- Transcode has a defined processing order (see below). PRE filters are processed in the (B) or (C) slot, whereas POST filters are processed not until the (E) or (F) slots. If both PRE and POST is supported, then there is mostly a parameter to choose which one should actually be used.
- frames needed The minimum amount of frames a filter needs to work
- Most filters only need one frame to work. But some filters look ahead to make a prediction or use information from previous frames. This has to be taken into account when choosing the processing boundaries (e.g. with -c parameter).
- /API - Writing filters with sample code.
- /Socket - communication with transcode at runtime via a socket
2. Available Filter
2.1. Audio Filter
2.2. Audio and Video Filter
2.3. Video Filter
Frame Rate Conversion