# Multi format decode The **gst-videocodec-concurrent-playback** application supports concurrent video playback for AVC (H.264) and HEVC (H.265) videos. It demonstrates the concurrent decoding capabilities of the Qualcomm Linux video engine, which can process different video codecs simultaneously. As shown in the following figure, the sample application uses H.264 and H.265 videos, both encapsulated in MP4 containers. The pipeline involves several elements for concurrent video playback. For more information about these elements, see [Pipeline flow](https://docs.qualcomm.com/doc/80-80021-50/topic/gst-videocodec-concurrent-playback.html#section-w2j-yvf-4bc). ## Run the application The following table lists the use cases that are supported through the gst-videocodec-concurrent-playback application: | Use case | Description | | --- | --- | | Video conferencing |

Simultaneously decodes the video streams of several participants.

Useful in a multi-party video conference scenario where the application manages several video streams.

| | Surveillance systems | Concurrently decodes video feeds from two separate cameras, each employing a different encoding method. | To run the use cases, do the following: 1. Ensure that you complete the [Prerequisites](https://docs.qualcomm.com/doc/80-80021-50/topic/mm_sample_apps_prerequisites.html). 2. Input `MP4 AVC (H.264)` and `HEVC (H.265)` video files on the target device. 3. In the terminal of the target device, use the following command to run the use case: gst-videocodec-concurrent-playback -i /etc/media/.mp4 -i /etc/media/.mp4 -o /etc/media/.yuv Copy to clipboard | Command-line parameter | Description | | --- | --- | | `-i` | Specifies the absolute path to the H.264 and H.265 input video files. Ensure that the H.264 input file is specified before H.265. | | `-o` | Specifies the absolute path to the H.265 output YUV file. | For example, for concurrent playback of multi-format videos, use the following command: gst-videocodec-concurrent-playback -i /etc/media/.mp4 -i /etc/media/.mp4 -o /etc/media/.yuv Copy to clipboard 4. To stop the use case, use **CTRL + C**. 5. In the terminal of the target device, run the following command in the SSH shell to display the available help options: gst-videocodec-concurrent-playback --help Copy to clipboard Note Due to the large size of YUV data, it’s recommended to run this use case for a short duration (less than 5 seconds) to avoid exhausting the storage space. ## Expected output - The H.264 video is displayed to the Wayland display. - The H.265 HEVC video is written to the YUV file. To play the YUV file, do the following: 1. Pull the YUV dump file from the device. 2. Use a YUV player running on the host to play the video. For example, select the `YUV420planarNV12` format, and use `1920 & 1088` as the stride and scan lines. Note If a default YUV player isn’t available on the host computer, use [https://sourceforge.net/projects/raw-yuvplayer/](https://sourceforge.net/projects/raw-yuvplayer/). ## Pipeline flow The following table lists the plugins used to run the videocodec concurrent playback pipeline: | Plugin | Description | | --- | --- | | filesrc | Reads the video data. | | qtdemux | Demultiplexes the video data. | | h264parse | Parses the H.264 video stream. | | h265parse | Parses the H.265 video stream. | | [v4l2h264dec](https://docs.qualcomm.com/doc/80-80021-50/topic/v4l2h264dec.html) | Decodes the H.264 video stream using Video4Linux. | | [v4l2h265dec](https://docs.qualcomm.com/doc/80-80021-50/topic/v4l2h265dec.html) | Decodes the H.265 video stream using Video4Linux. | | [Waylandsink](https://docs.qualcomm.com/doc/80-80021-50/topic/waylandsink.html) | Displays the H.264 video stream on Wayland display. | | filesink | Writes the H.265 video to a YUV file for playback. | ## Known issue Video playback may not work as expected when the stream is generated from a file source. Last Published: Mar 26, 2026 [Previous Topic Smart codec](https://docs.qualcomm.com/bundle/publicresource/80-80021-50/topics/smart-codec.md) [Next Topic Audio-video playback](https://docs.qualcomm.com/bundle/publicresource/80-80021-50/topics/gst-audio-video-playback.md)