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• RTP server on embedded device and client on Android

  15 juin 2015, par Shashi Ranjan

  I have an embedded device which has Wifi and Audio capabilities. I want to make my Android phone communicate to it using RTP. I have already tried Mobile to Mobile RTP audio communications. That works like charm. But now I want to try, one side Android and other side this embedded device. Could anyone point me to the source code (simple one as less RAM in embedded device) of basic RTP.

  I am using ffmpeg on Windows PC to simulate the embedded device. When I "join()" the RTP from my Android, I get the error as 0x64 wrong protocol type.

  If I get a basic handshake between the devices for audio, it will be great.

• Best Web Video Encoding Practices for IOS (FFMpeg)

  21 juin 2012, par MagicMushroom

  I am working on an online video repository system for a client, written mostly in PHP. At the moment I am building a mobile version of our desktop website. Our desktop site allows users to watch videos in the browser, much like YouTube.

  My client uploads videos through the manager interface I have created, and my application uses FFmpeg on the server to transcode his videos into several resolutions and bitrates. I am no expert on FFmpeg, and while I do not know the ins and outs of each individual setting, I do understand how it works as a whole. Right now, we are using the mp4 container format with the h.264 codec to encode our videos. Our command looks like :

  ffmpeg -y -i "INPUT FILE.mov" -f mp4 -s 640x480 -vcodec libx264 -preset fast -maxrate 1500 -bitrate 1000 -bufsize 4096 -acodec libfaac -ab 192 -ac 2 "OUTPUT_FILE.mp4" >> "FILE.log" 2>&1 &

  I'm hoping to gain information about best practices with encoding video for web streaming on IOS and other mobile devices using FFmpeg. What resolutions and settings make for good mobile streaming video ? How can I ensure maximum compatibility across the sea of Android devices ?

• Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  28 août 2020, par bbdangar

  I am using this library : com.arthenica:mobile-ffmpeg-full:4.4

  


  Getting this error message while running the command :

  


  final String command = "-y -i "+ inputPath +" -ar 22050 -hls_list_size 1000000 -hls_time 2 -s 640x360 " + outputPath;


  


  here is the complete code :

  


  private void convertVideo() {
        String inputPath = "/storage/emulated/0/Download/video.mp4";
        String outputPath = "/storage/emulated/0/Download/output.m3u8";
        final String command = "-y -i "+ inputPath +" -ar 22050 -hls_list_size 1000000 -hls_time 2 -s 640x360 " + outputPath;
        FFmpeg.executeAsync(command, new ExecuteCallback() {
            @Override
            public void apply(long executionId, int returnCode) {

                if (returnCode == RETURN_CODE_SUCCESS) {
                    Log.i(TAG, "Command execution completed successfully.");
                } else if (returnCode == RETURN_CODE_CANCEL) {
                    Log.i(TAG, "Command execution cancelled by user.");
                } else {
                    Log.i(TAG, String.format("Command execution failed with rc=%d and the output below.", returnCode));
                    Config.printLastCommandOutput(Log.INFO);
                }
            }
        });

    }


  


  here is output log :

  


  2020-08-28 07:05:59.355 10725-10820 W/mobile-ffmpeg: [graph 0 input from stream 0:0 @ 0xe2306c80] sws_param option is deprecated and ignored
2020-08-28 07:05:59.448 10725-10820 E/mobile-ffmpeg: [h264_v4l2m2m @ 0xcb442c00] can't configure encoder
2020-08-28 07:05:59.448 10725-10820 E/mobile-ffmpeg: Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
2020-08-28 07:05:59.463 10725-10820 I/mobile-ffmpeg: Conversion failed!
2020-08-28 07:05:59.465 10725-10725 I/mobile-ffmpeg: ffmpeg version v4.4-dev-416 Copyright (c) 2000-2020 the FFmpeg developers