Image Play (nvmimg_play)
This topic describes how to use the nvmimg_play sample application for stream decoding. The sample supports the following bitstream types:
• H.264
• H.265
Command Line Options
The following shows the command syntax.
$ ./nvmimg_play [options]
Required Commands
The following table describes the required command line arguments.
Option | Parameter | Description |
-c | [codec_type] | Specifies numeric or textual codec type. You can specify it with integers: • 1: H.264 • 2: H265 Or with strings: • h264 • h265 |
-f | [input_file] | Specifies the input file to decode. |
Optional Commands
The following table describes the optional command line arguments.
Option | Parameter | Description |
-r | [frame_rate] | Specifies the frame rate, in frames per second. |
-n | [frame_number] | Specifies the minimum number of frames to decode. Default: Whole stream. |
-s | [output_file] | Specifies a filename where output YUV is saved. |
-v | [logging_level] | Specifies verbose logging. Higher logging levels also include the lower-level logging messages. • 0: Errors (default) • 1: Warnings • 2: Info • 3: Debug |
-d | [display_id] | Specifies the display ID. Default: No display. |
-w | [window_id] | Specifies the window ID. Default: 1. |
-p | [window_position] | Specifies the display window position, in pixels. Default: full screen. Input format: x0:y0:width:height |
-z | [window_depth] | Specifies window depth. Permissible values are [0-255]. Default: 1. |
-h | N/A | Prints usage and help information. |
-id | [instance_id] | Specifies nvdec instance id to be used for decoding. Permissible values are 0 and 1. Default: 0 |
Examples
The nvmimg_play application performs stream decoding. It can display decoded frames on the screen (playback) and/or save decoded frames to an output YUV file. This section provides examples on how to run the application.
Basic Playback
The following command starts a playback of the disney.264 file on window ID 0.
$ ./nvmimg_play -c 4 -f disney.264 -d 0
Display Option Examples
This section provides two examples of display option usage.
Display Window Manipulation
This command is an example of display window manipulation:
$ ./nvmimg_play -c 4 -f disney.264 -d 0 -w 2 -z 20 -p 100:200:500:600
In this example:
• Playback starts on display ID 0.
• Window number is 2.
• Position is:
• x0=100
• y0=200
• width=500
• height=600
• Window depth is set to 20 (depth range is 0-255).
Save Decoded Frames to Output File
$ ./nvmimg_play -c 4 -f disney.264 -s disney_out.yuv
This example decodes the disney.264 stream and saves the decoded frames to the disney_out.yuv file.
Playback Duration Examples
Number of Frames to Decode
$ ./nvmimg_play -c 4 -f disney.264 -d 0 -n 100
This example streams to display ID 0 the first 100 frames from the disney.264 file.
Number of Loops
$ ./nvmimg_play -c 4 -f disney.264 -d 0 -l 10
This example plays disney.264 10 times and streams the video to display ID 0.
