# DeepStream SDK FAQ

**URL:** <https://forums.developer.nvidia.com/t/deepstream-sdk-faq/80236>\
**Category:** DeepStream SDK\
**Created:** [August 20, 2019, 7:54am UTC](https://forums.developer.nvidia.com/t/deepstream-sdk-faq/80236 "2019-08-20T07:54:41Z")\
**Posts on this page:** 1\
**Showing post:** 34

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**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\
**Post date:** [May 11, 2023, 6:34am UTC](https://forums.developer.nvidia.com/t/deepstream-sdk-faq/80236/34 "2023-05-11T06:34:47Z")

</div>

**26.[Deepstream6.2 Gst-nvstreammux & Gst-nvstreammux New]How to set parameters reasonably to improve the efficiency of nvstreammux in live mode**

**Gst-nvstreammux:**

- Set the batch-size to the number of sources
- export NVSTREAMMUX\_ADAPTIVE\_BATCHING=yes
- If you want to get high fps, set the batched-push-timeout to the (1000000 us/maximum fps among the videos)

**Gst-nvstreammux New(export USE\_NEW\_NVSTREAMMUX=yes):**

- Set the batch-size to the number of sources
- Should not turn off the adaptive-batching parameter
- Please refer to the following basic tuning principles first：[Gst-nvstreammux Tuning parameters](https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_plugin_gst-nvstreammux2.html#id5)
- Set the max-same-source-frames to ceil(maximum fps/minimum fps)
- Set the max-num-frames-per-batch of each source to ceil(current fps/minimum fps)

**Experiment:** There are 3 live sources with fps 15, 25 and 30 respectively for runtime source addition/deletion scenarios. We’ll delete the video of 25 fps when the pipeline is running.

**Build rtsp server:**

- Install FFmpeg $ sudo apt-get install ffmpeg
- $docker run --rm -it --network=host aler9/rtsp-simple-server
- Prepare videos with different frame rates： 15fps.mp4 25fps.mp4 30fps.mp4
- Open a new terminal and run: $ffmpeg -re -stream\_loop -1 -i 15fps.mp4 -c:v copy -an -f rtsp -rtsp\_transport tcp rtsp://127.0.0.1:8554/stream0
- Open a new terminal and run: $ffmpeg -re -stream\_loop -1 -i 25fps.mp4 -c:v copy -an -f rtsp -rtsp\_transport tcp rtsp://127.0.0.1:8554/stream1
- Open a new terminal and run: $ffmpeg -re -stream\_loop -1 -i 30fps.mp4 -c:v copy -an -f rtsp -rtsp\_transport tcp rtsp://127.0.0.1:8554/stream2

**Build demo code:**  
[config\_mux\_source3.txt](https://forums.developer.nvidia.com/uploads/short-url/q2DUszMBRTpH6dUgx3QxuQv8q8g.txt) (2.9 KB)  
[deepstream\_test\_rt\_src\_add\_del.c](https://forums.developer.nvidia.com/uploads/short-url/iG2MFprxANz2iOYRAaa7l6Rv6T7.c) (26.1 KB)  
[Makefile](https://forums.developer.nvidia.com/uploads/short-url/mruoz0VKr0F4r9AYx5aL6ai6LVI) (2.0 KB)

```auto
 $cd /opt/nvidia/deepstream/deepstream/sources/apps/sample_apps/
 $git clone https://github.com/NVIDIA-AI-IOT/deepstream_reference_apps.git
 $cd deepstream_reference_apps/runtime_source_add_delete/

Replace files in the directory with attached files
 $cp deepstream_test_rt_src_add_del.c ./deepstream_test_rt_src_add_del.c
 $cp Makefile ./Makefile
 $cp config_mux_source3.txt ./
 $export CUDA_VER=11.8
 $make

```

**Run:**

- ./deepstream-test-rt-src-add-del 0 filesink 1
- You can add and delete streams by pressing “a” and “d” on the keyboard.

**FPS For Streams with Gst-nvstreammux :**

- Set batched-push-timeout to 70000 ms \> 1000000 us/ 15fps
  1. Start with all streams

```auto
 **PERF: 14.03 (14.95) 25.05 (24.98) 25.05 (24.92)
 **PERF: 15.26 (14.95) 24.42 (24.98) 24.42 (24.92)
 **PERF: 14.71 (14.95) 25.51 (24.98) 25.51 (24.92)
 **PERF: 15.04 (14.95) 25.07 (24.98) 25.07 (24.92)

```

  1. Delete the stream source of 25 fps

```auto
 **PERF: 14.52 (14.96) 16.59 (23.21) 0.00 (19.20)
 **PERF: 15.53 (14.96) 16.66 (23.19) 0.00 (19.13)
 **PERF: 14.73 (14.96) 16.49 (23.17) 0.00 (19.07)
 **PERF: 14.51 (14.96) 16.58 (23.14) 0.00 (19.00)

```

- Set batched-push-timeout to 40000 ms = 1000000 us/ 25fps
  1. Start with all streams

```auto
 **PERF: 15.12 (13.89) 30.24 (28.01) 25.20 (23.92)
 **PERF: 14.94 (13.91) 29.88 (28.03) 24.90 (23.93)
 **PERF: 14.98 (13.91) 29.95 (28.03) 24.32 (23.93)
 **PERF: 15.01 (13.93) 10.32 (27.84) 25.63 (23.95)

```

  1. Delete the stream source of 25 fps

```auto
 **PERF: 14.47 (14.27) 24.80 (28.13) 0.00 (21.76)
 **PERF: 15.51 (14.28) 24.84 (28.11) 0.00 (21.61)
 **PERF: 14.95 (14.28) 24.92 (28.09) 0.00 (21.46)
 **PERF: 14.83 (14.29) 24.83 (28.07) 0.00 (21.31)

```

- Set batched-push-timeout to 20000 ms \< 1000000 us/ 30 fps
  1. Start with all streams

```auto
 **PERF: 15.00 (14.82) 29.58 (36.49) 24.81 (25.10)
 **PERF: 14.94 (14.85) 30.09 (35.51) 25.08 (25.09)
 **PERF: 15.07 (14.88) 30.38 (34.65) 25.14 (24.98)
 **PERF: 15.00 (14.89) 29.54 (34.22) 24.78 (25.07)

```

  1. Delete the stream source of 25 fps

```auto
 **PERF: 14.97 (14.83) 30.11 (30.67) 0.00 (23.22)
 **PERF: 15.07 (14.83) 30.11 (30.65) 0.00 (22.71)
 **PERF: 14.92 (14.83) 29.71 (30.64) 0.00 (22.21)
 **PERF: 14.95 (14.84) 30.22 (30.62) 0.00 (21.73)

```

**FPS For Streams with Gst-nvstreammux New:**

max-num-frames-per-batch: Max number of this stream’s frames allowed to be muxed per output batch buffer  
max-same-source-frames: Max number of any stream’s frames allowed to be muxed per output batch

A. Plugin Parameters Settings:

- max-same-source-frames=1
- 15 fps video: max-num-frames-per-batch=1
- 25 fps video: max-num-frames-per-batch=1
- 30 fps video: max-num-frames-per-batch=1
  1. Start with all streams

```auto
 **PERF: 15.22 (14.54) 14.00 (14.88) 14.42 (13.84)
 **PERF: 13.89 (14.55) 14.58 (14.86) 14.13 (13.82)
 **PERF: 14.00 (14.54) 14.00 (14.84) 14.42 (13.84)
 **PERF: 15.00 (14.55) 14.59 (14.82) 13.46 (13.85)

```

  1. Delete the stream source of 25 fps

```auto
 **PERF: 13.46 (14.52) 15.00 (14.81) 0.00 (13.35)
 **PERF: 15.22 (14.51) 14.00 (14.79) 0.00 (13.07)
 **PERF: 13.89 (14.51) 14.58 (14.77) 0.00 (12.80)
 **PERF: 14.00 (14.50) 14.00 (14.75) 0.00 (12.54)

```

B. Plugin Parameters Settings:

- max-same-source-frames=2
- 15 fps video: max-num-frames-per-batch=1
- 25 fps video: max-num-frames-per-batch=2
- 30 fps video: max-num-frames-per-batch=2
  1. Start with all streams

```auto
 **PERF: 14.79 (14.90) 29.68 (29.84) 25.58 (24.86)
 **PERF: 15.16 (14.90) 30.09 (29.86) 24.32 (24.88)
 **PERF: 14.89 (14.90) 29.87 (29.87) 25.88 (24.90)
 **PERF: 15.09 (14.90) 30.38 (29.87) 24.30 (24.88)

```

  1. Delete the stream source of 25 fps

```auto
 **PERF: 15.04 (14.94) 30.08 (29.92) 0.00 (17.51)
 **PERF: 14.94 (14.94) 29.86 (29.92) 0.00 (17.32)
 **PERF: 15.00 (14.94) 29.85 (29.92) 0.00 (17.15)
 **PERF: 15.08 (14.95) 30.54 (29.93) 0.00 (16.97)

```

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