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|
# `hello-transcode` Sample
This sample shows how to use the oneAPI Video Processing Library (oneVPL) to
perform simple video transcode.
| Optimized for | Description
|----------------- | ----------------------------------------
| OS | Ubuntu* 20.04; Windows* 10
| Software | Intel® oneAPI Video Processing Library(oneVPL) CPU implementation
| What You Will Learn | How to use oneVPL to transcode a MJPEG encoded video file to H.265 encoded video file
| Time to Complete | 5 minutes
The hello-transcode sample currently only supports Software mode.
## Purpose
This sample is a command line application that takes a file containing a JPEG video elementary stream as an argument, decodes it, and encodes the output with oneVPL and writes the encoded output to the file `out.h265` in H.265 format.
## Key Implementation details
| Configuration | Default setting
| ----------------- | ----------------------------------
| Target device | CPU
| Input format | MJPEG video elementary stream
| Output format | H.265 video elementary stream
| Output resolution | same as input
## License
Code samples are licensed under the MIT license. See
[License.txt](https://github.com/oneapi-src/oneAPI-samples/blob/master/License.txt) for details.
## Building the `hello-transcode` Program
### Include Files
The oneVPL include folder is located at these locations on your development system:
- Windows: %ONEAPI_ROOT%\vpl\latest\include
- Linux: $ONEAPI_ROOT/vpl/latest/include
### On a Linux* System
Perform the following steps:
1. Install the prerequisite software. To build and run the sample you need to
install prerequisite software and set up your environment:
- Intel® oneAPI Base Toolkit for Linux*
- [CMake](https://cmake.org)
2. Set up your environment using the following command.
```
source <oneapi_install_dir>/setvars.sh
```
Here `<oneapi_install_dir>` represents the root folder of your oneAPI
installation, which is `/opt/intel/oneapi/` when installed as root, and
`~/intel/oneapi/` when installed as a normal user. If you customized the
installation folder, it is in your custom location.
3. Build the program using the following commands:
```
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
cmake --build .
```
4. Run the program with default arguments using the following command:
```
./hello-transcode -sw -i ../../../content/cars_320x240.mjpeg
```
### On a Windows* System Using Visual Studio* Version 2017 or Newer
#### Building the program using CMake
1. These instructions assume you can read and write to the location
the examples are stored. If the examples have been installed in a
protected folder such as "Program Files" copy the entire `examples`
folder to a location with Read/Write access such as the Desktop
(%USERPROFILE%\Desktop) and resume these instruictions from that copy.
2. Install the prerequisite software. To build and run the sample you need to
install prerequisite software and set up your environment:
- Intel® oneAPI Base Toolkit for Windows*
- [CMake](https://cmake.org)
3. Set up your environment using the following command.
```
<oneapi_install_dir>\setvars.bat
```
Here `<oneapi_install_dir>` represents the root folder of your oneAPI
installation, which is which is `C:\Program Files (x86)\Intel\oneAPI\`
when installed using default options. If you customized the installation
folder, the `setvars.bat` is in your custom location. Note that if a
compiler is not part of your oneAPI installation you should run in a Visual
Studio 64-bit command prompt.
4. Build the program with default arguments using the following commands:
```
mkdir build
cd build
cmake ..
cmake --build . --config Release
```
5. Run the program using the following command:
```
Release\hello-transcode -sw -i ..\..\..\content\cars_320x240.mjpeg
```
## Running the Sample
### Example of Output
```
Implementation details:
ApiVersion: 2.5
Implementation type: SW
AccelerationMode via: NA
Path: /opt/intel/oneapi/vpl/2021.6.0/lib/libvplswref64.so.1
Transcoding /home/test/intel_innersource/frameworks.media.onevpl.dispatcher/examples/hello/hello-transcode/../../content/cars_320x240.mjpeg -> out.h265
Transcoded 30 frames
```
You can find the output file `out.h265` in the build directory.
You can display the output with a video player that supports raw streams such as
FFplay. You can use the following command to display the output with FFplay:
```
ffplay out.h265
```
|
