Decoding Sample works with Intel® Media SDK (hereinafter referred to as "SDK").
It demonstrates how to use the SDK API to create a sample console application that performs decoding of various video compression formats.
The sample is able to work with HEVC Decoder & Encoder (hereinafter referred to as "HEVC").
Note: To run HEVC, please read the instructions in the “HEVC Plugin” section carefully.
Decoding Sample supports the following video formats:
| Format type | |
|---|---|
| input (compressed) | H.264 (AVC, MVC – Multi-View Coding), MPEG-2 video, VC-1, JPEG*/Motion JPEG, HEVC (High Efficiency Video Coding), VP8, AV1 |
| output (uncompressed) | YUV420 |
Note 2: Decoding Sample renders the decoded video stream to a file in YUV 4:2:0 sampling format, with the color planes Y, U and V in that order.
See <install-folder>/Media_Samples_Guide_Linux.md.
See <install-folder>/Media_Samples_Guide_Linux.md.
See <install-folder>/Media_Samples_Guide_Linux.md.
See <install-folder>/Media_Samples_Guide_Linux.md.
The executable file requires the following command-line switches to function properly:
| Option | Description |
|---|---|
| h265|h264|mpeg2|vc1|vp8|mvc|jpeg|av1 | Input video type. This is an elementary video stream. The use of option h265 is possible only if corresponding plugins are installed. |
| -i <InputFile> | Input (compressed) video file, name and path. |
| -o <Output> | Specifies output (YUV) video file(s), name and path. With MVC, specify the file name without extension to use as a pattern. The sample creates several output files with names such as “filename_N.yuv” according to the number of views in the MVC stream. |
The following command-line switches are optional:
| Option | Description |
|---|---|
| [-?] | print help |
| [-hw] | use platform specific SDK implementation (default) |
| [-sw] | use software implementation, if not specified platform specific SDK implementation is used |
| [-p plugin] | decoder plugin. Supported values: hevcd_sw, hevcd_hw, vp8d_hw, vp9d_hw, camera_hw, capture_hw |
| [-path path] | path to plugin (valid only in pair with -p option) (optional for Media SDK in-box plugins, required for user-decoder ones) |
| [-fps] | limits overall fps of pipeline |
| [-w] | output width |
| [-h] | output height |
| [-di bob/adi] | enable deinterlacing BOB/ADI |
| [-scaling_mode] | specify scaling mode (lowpower/quality) for VPP |
| [-d] | enable decode error report |
| [-jpeg_rgb] | RGB Chroma Type |
| [-device /path/to/device] | set graphics device for processing. For example: -device /dev/dri/renderD128. If not specified, defaults to the first Intel device found on the system. |
| [-ignore_level_constrain] | ignore level constrain (AVC) |
| Output format parameters: | |
| [-i420] | pipeline output format: NV12, output file format: I420 |
| [-nv12] | pipeline output format: NV12, output file format: NV12 |
| [-yuy2] | pipeline output format: YUV2, output file format: YUV2 |
| [-uyvy] | pipeline output format: UYVY, output file format: UYVY |
| [-rgb4] | pipeline output format: RGB4, output file format: RGB4 |
| [-rgb4_fcr] | pipeline output format: RGB4 in full color range, output file format: RGB4 in full color range |
| [-p010] | pipeline output format: P010, output file format: P010 |
| [-a2rgb10] | pipeline output format: A2RGB10, output file format: A2RGB10 |
| [-vaapi] | work with vaapi surfaces |
| [-r] | render decoded data in a separate X11 window |
| [-rdrm] | render decoded data in a thru DRM frame buffer |
| [-window x y w h] | set render window position and size |
| [-low_latency] | configures decoder for low latency mode (supported only for H.264 and JPEG codec) |
| [-calc_latency] | calculates latency during decoding and prints log (supported only for H.264 and JPEG codec) |
| [-async] | depth of asynchronous pipeline. default value is 4. must be between 1 and 20 |
| [-gpucopy::<on,off>] | Enable or disable GPU copy mode |
| [-timeout] | timeout in seconds |
| [-dec_postproc force/auto] | resize after decoder using direct pipe force: instruct to use decoder-based post processing or fail if the decoded stream is unsupported auto: instruct to use decoder-based post processing for supported streams or perform VPP operation through separate pipeline component for unsupported streams |
| [-threads_num] | number of mediasdk task threads |
| [-threads_schedtype] | scheduling type of mediasdk task threads |
| [-threads_priority] | priority of mediasdk task threads Note on the scheduling types and priorities: <sched_type>: <priority_min> .. <priority_max> The following scheduling types requires root privileges: fifo: 1 .. 99 (static priority: low .. high) rr: 1 .. 99 (static priority: low .. high) The following scheduling types can be used by non-privileged users: other: 0 .. 0 (static priority always 0) batch: 0 .. 0 (static priority always 0) idle: n/a If you want to adjust priority for the other or batch scheduling type, you can do that process-wise using dynamic priority - so called nice value. Range for the nice value is: -20 .. 20 (high .. low) Please, see 'man(1) nice' for details. Example: ./sample_decode h265 -i in.bit -o out.yuv -p 15dd936825ad475ea34e35f3f54217a6 |
Note 1: You need to have HEVC installed to run with h265 codec. In case of HW library (-sw key is not specified) it will firstly try to load HW plugin, in case of failure - it will try SW one if available.
Below are examples of a command-line to execute Decoding Sample:
$ sample_decode h264 -i input.h264 -o output.yuv -hw
Please, also pay attention on “Running the Software” section of <install-folder>/Media_Samples_Guide.md document where you will find important notes on backend specific usage (drm and x11).
HEVC codec is implemented as a plugin unlike codecs such as MPEG2 and AVC. We provide 2 implementations of the HEVC decoders: Software (SW) and Hardware (HW).
Note 1: The HEVC SW plugin is available in the HEVC package which is part of the Intel® Media Software Development Kit 2018. You can find the available plugins and their IDs from $MFX_ROOT/include/mfxplugin.h file.
Note 2: HW plugin for HEVC Decode is supported starting from 6th Generation of Intel CoreTM Processors, Intel® Xeon® E3-1200 and E3-1500 v5 Family with Intel® Processor Graphics 500 Series (codename Skylake).
Note 3: Decoding sample loads the HW HEVC decode plugin with HW library and SW decode with SW library by default. You can enforce a plugin to be loaded by specifying the plugin ID using "-p" parameter and hexadecimal GUID.
Examples of using HW HEVC decoder and HW library:
$ sample_decode h265 -i input.265 -o output.yuv
$ sample_decode h265 -i input.265 -o output.yuv -hw
Examples of SW HEVC decoder usage (the first instance loads SW library, the second one HW library):
$ sample_decode h265 -i input.265 -o output.yuv -sw
$ sample_decode h265 -i input.265 -o output.yuv –p 33a61cb4c27454ca8d85dde757c6f8e
-
Decoding Sample does not fully decode some video streams from a networked folder. Instead, copy the input file to local storage prior to decoding.
-
Decoding Sample renders output in the simplest way. The rendering window does not support time stamps, aspect ratio.
-
Decoding Sample cannot render P010 streams in case of SW library usage.
-
-low_latencyand–сalc_latencyoptions should be used with H.264 streams having exactly 1 slice per frame. Preferable streams for an adequate latency estimate are generated by Conferencing Sample. The options are also effective for JPEG* input streams. For all other input formats application would return an error. -
If overlay is not supported by your hardware or software you won’t be able to render the decoded MVC stream.
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Application may return error for some MJPEG streams decoded with option –low_latency.
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In case of using HEVC plugin (h265 video type), only software implementation of that plugin is used by default (even if you provide -hw option). To force usage of HEVC HW plugin implementation, please use -p option with proper plugin GUID.
-
VP8 HW decoding is not working if system memory is used.
-
SW HEVC plugin in 10bit mode cannot be used together with HW library VPP. Although library allows that, this is bad practice because additional per-pixel data shift is required. Please use HW HEVC + HW library or SW HEVC + SW library instead.
-
Low latency mode (-low_latency) is not compatible with HEVC decoder.
-
Sample may exit with wrong status code (MFX_MORE_SURFACE) and messages
[ERROR], sts=MFX_ERR_MORE_SURFACE(-11), RunDecoding, Unexpected error!!
[ERROR], sts=MFX_ERR_MORE_SURFACE(-11), main, Pipeline.RunDecoding failed
This may occur when number of outputted frames becomes equal to number of frames specified by "-n <frames>" command line parameter while current status is MFX_MORE_SURFACE. No negative side effects present, requested number of frames are properly decoded.
-
Sample may not function properly on systems that have a non-Intel VGA controller as the first (primary) because Intel device is not first in the list.
To workaround this issue, swap names of DRI device files:
$ cd /dev && mv card0 tmp && mv card1 card0 && mv tmp card1and do the same for the files
control64/65andrenderD128/129
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