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rtmp

README.md

RTMP

Example Brief

RTMP protocol is widely used in live streaming, realising one-to-many live broadcast support through server forwarding. This example demonstrates how to implement common RTMP scenarios such as Pusher, Puller, and Server Application on the ESP32 series boards, as well as the basic usage of the esp_rtmp module.

  • Pusher Application It gathers video and audio data from the camera and microphone, and then sends it to RTMP Server. It supports the configuration of video resolution, video frame rate, audio format, audio sample rate, and audio channel.
  • Puller Application It fetches audio and video data from the RTMP server and stores them into SDCard with FLV format. It is suitable for offline playback or extends to playback on board afterwards.
  • Server Application It sets up a RTMP server on board. It supports to connect into multiple clients and broadcast stream data from Pusher to Puller.

Pusher Application and Server Application can be run on board at the same time in order to set up a local live streaming server.
Detailed codec support for esp_rtmp is as follows:

esp_rtmp Supported Standard RTMP Supported Notes
PCM Y Y
G711 alaw Y Y
G711 ulaw Y Y
AAC Y Y
MP3 Y Y
H264 Y Y
MJPEG Y N Use CodecID 1 for MJPEG

To play RTMP living stream or saved FLV file on a PC, please refer to Example Functionality.

Environment Setup

Hardware Required

This example runs on the boards that are marked with a green checkbox in the table. Please remember to select the board in menuconfig as discussed in Section Configuration below.

The camera model tested in this example is OV3660. For other models, please refer to esp32-camera.

Build and Flash

Default IDF Branch

This example supports IDF release/v4.4 and later branches. By default, it runs on IDF release/v4.4.

IDF Branch

  • The command to switch to IDF release/v4.4 branch is as follows:

    cd $IDF_PATH
git checkout master
git pull
git checkout release/v4.4
git submodule update --init --recursive

Configuration

The default board for this example is ESP32-S3-Korvo-2.

Choose RTMP Application work mode:

menuconfig > RTMP APP Configuration > Choose RTMP APP Work Mode

Configuration for Wireless network SSID and Password:

menuconfig > RTMP APP Configuration > `WiFi SSID` and `WiFi Password`

Configuration for RTMP server connection URI address:

menuconfig > RTMP APP Configuration > RTMP Server URI

If you are using a USB camera, please enable the following configuration, and change USB setting in record_src_cfg.h

 menuconfig > AV Record Configuration > Support For USB Camera

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output (replace PORT with your board's serial port name):

idf.py -p PORT flash monitor

To exit the serial monitor, type Ctrl-].

For full steps to configure and build an ESP-IDF project, please go to ESP-IDF Programming Guide and select the chip and version in the upper left corner of the page.

How to Use the Example

Example Functionality

  • Set up RTMP server on PC
    If you are using an Ubuntu system, please refer to nginx RTMP server setting

  • Push and Playback RTMP media stream
    Once the RTMP application is running, you can access and test it with a common RTMP Pusher (ffmpeg) or RTMP Puller Software (ffmpeg, VLC, Pot Player, etc).
    Since example uses MJPEG codec which have no official support yet, the video content in generated living stream by RTMP Pusher application and saved FLV file can't be recognized by common PC player. To play it, you can unzip ffmpeg.7z to get ffplay.exe directly on Windows, or you can modify the source code referring to ffmpeg_mjpeg.patch for latest FFmpeg and follow FFmpeg Compilation Guide to build.

  • Push RTMP stream to RTMP server on board, using ffmpeg
    Please replace YOUR_PUSH_FILE with your push file path, and replace RTMP_SERVER_IP_ADDRESS with your board IP address

     ffmpeg -stream_loop -1 -re -i YOUR_PUSH_FILE.mp4 -c copy -f flv  rtmp://RTMP_SERVER_IP_ADDRESS:1935/live/streams

  • Using ffmpeg to play RTMP stream or recorded FLV file from the board

     ffplay -fflags nobuffer rtmp://RTMP_SERVER_IP_ADDRESS:1935/live/stream
 ffplay src.flv

  • CLI settings

    • help Query all supported commands
    • set Setup audio and video configuration
      • sw_jpeg Whether using software JPEG encoder
      • quality Setup video quality, refer to av_record_video_quality_t
      • fps Setup video framerate
      • channel Setup audio channel
      • sample_rate Setup audio sample rate
      • afmt Setup audio format, refer to av_record_audio_fmt_t
      • vfmt Setup audio format, refer to av_record_video_fmt_t
      • url Setup RTMP or RTMPS server URL
      Configuration example:
set vfmt 1 sw_jpeg 0 quality 2 fps 25 afmt 1 channel 1 sample_rate 22050
    • start Start to run RTMP applications
    • stop Stop the running applications
    • i Query current CPU loading and memory usage
    • connect Connect to wifi using ssid and password

  • Performance measured

    • Maximum video framerate when using camera encoded JPEG

      Video Resolution Max FPS
      1280 X 720 17
      1024 X 768 27
      640 X 480 27
      480 X 320 32
      320 X 240 27

    • Maximum video framerate when software encoded JPEG

      Video Resolution Max FPS
      640 X 480 11
      480 X 320 22
      320 X 240 22

    • Maximum video framerate when software encoded H264

      Video Resolution Max FPS
      320 X 240 10

How to push stream to Youtube

  • Get RTMP or RTMPS stream URL from Youtube
    • Login in to Youtube
    • Click the camera icon in the top-right corner
    • Click Go Live in the dropdown menu, you will see following page
      alt text
    • Combine the Stream URL and Stream key together to form RTMP or RTMPS URL 
      rtmp://a.rtmp.youtube.com/live2/************
rtmps://a.rtmp.youtube.com/live2/***********
  • Streaming to Youtube
    • Login in to Youtube and start live stream channel firstly
    • Configuration according Configuration and send start after system boot-up, then you can see the streaming video on Youtube. If you want to stop streaming process, just send stop command.
    • Notes: Youtube only support H264 video codec, push MJPEG codec will cause connection fail. Sometimes DNS get wrong IP address, please try URL rtmp://142.250.179.172/live2/*********** instead.

Debug Tips

  • Some error log will print out during stopping process, it is normal, please ignore it if system runs OK
  • Prefer to use the default settings so that RAM space is enough If meet MEDIA_OS: Fail to create thread, please use IDF 4.4.3 or higher version to put thread stack onto SPI-RAM or else remove the condition CONFIG_SPIRAM_ALLOW_STACK_EXTERNAL_MEMORY in media_lib_os_freertos.c
  • If you meet system not response issue, sometimes it is network issue please wait for a while. If it doesn't response for long time, please enable following config, when issue happen send assert command to use GDB to check the overall system status (command: thread apply all bt) 
    menuconfig > ESP System Settings > GDBStub on panic
  • If you are using OV3660, sometimes camera send error log: cam_hal: FB-SIZE: 138240 != 153600, it is sensor error, using OV2640 no such error log shown.
  • If you meet error log RTMP_Connect: Remove fd 57 for timeout:74 size:346710 when you are sending out high quality video from RTMP server. It means client doesn't read data until fifo exceed limit. You can either enlarge the fifo limit RTMP_SERVER_CLIENT_CACHE_SIZE in rtmp_server_app.c or send lower quality video.
  • All RTMP application will continue to run until timeout. You can change timeout setting RTMP_APP_RUN_DURATION in main.c to do long test.
  • To have better performance, AAC encoder input is limited to be 16k, 1 channel. You can remove the limit in rtmp_push_app.c.

Technical Support and Feedback

Please use the following feedback channels:

  • For technical queries, go to the esp32.com forum
  • For a feature request or bug report, create a GitHub issue

We will get back to you as soon as possible.