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• cmdutils & opencl : add -opencl_bench option to test and show available OpenCL devices

  9 décembre 2013, par Lenny Wang

  cmdutils & opencl : add -opencl_bench option to test and show available OpenCL devices
  Reviewed-by : Wei Gao <highgod0401@gmail.com>
  
  Reviewed-by : Stefano Sabatini <stefasab@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] Makefile
  • [DH] cmdutils.c
  • [DH] cmdutils.h
  • [DH] cmdutils_common_opts.h
  • [DH] cmdutils_opencl.c
  • [DH] doc/APIchanges
  • [DH] doc/fftools-common-opts.texi
  • [DH] doc/utils.texi
  • [DH] libavutil/opencl.c
  • [DH] libavutil/opencl.h
  • [DH] libavutil/version.h

• 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


  


• ffmpeg C API (libswscale) : Scale a frame into an output frame with given width/height preserving aspect ratio, fill out the rest with transparency

  12 juin 2015, par nik4emniy

  Note : I need to use ffmpeg’s C API in my project.
  Input : video(let’s say,first frame)/image, output_width, output_height
  Output : PNG image with output_width/output_height.

  What I’ve done so far :

  a) decoded a frame from input into frame1

  b) sws_scale frame1 with needed context (output_width, output_height) into frame2

  c) initialized AVCodec CODEC_ID_PNG

  d) encoded frame2 into initialized AVPacket

  e) wrote AVPacket’s data into file

  So I have a working cycle that produces a PNG image, but it doesn’t save the aspect ratio (obviously).
  What I want to achieve is do the same thing preserving aspect ratio (which would change the frame2’s width||height), but then "centring" that image and filling out the "empty" parts with tranparent layer in the final PNG.

  Does anyone have an idea on how this can be achieved ?
  Again, I need to use C API, not command line.