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• Can't decode HEVC video with DXVA2 and ffmpeg

  10 mai 2018, par Igor

  I can’t use DXVA2 hardware acceleration for decoding of HEVC video with ffmpeg. DXVA2 for H.264 works fine.

  I compiled an official example hw_decode.c from ffmpeg sources :

  https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/hw_decode.c

  When I call av_send_packet() it performs a callback assigned in AVCodecContext->get_format and returns only AV_PIX_FMT_YUV420P for HEVC video instead of AV_PIX_FMT_DXVA2_VLD for all H.264 videos. So HW decoding doesn’t work.

  Software decoding of HEVC works without problems.

  MPC-HC plays fine HEVC video with DXVA2 (CPU loading is low and Task Manager shows work of Video decoder in GPU details). My video card is Geforce 1060.

• Ffmpeg - avio_open returns AVERROR -13

  10 septembre 2021, par Tolga

  In my project, I am trying to save mp4 video from frames. I am demuxing video first and then decode and save the .mp4 file beside frames. However, this mp4 file is only playable from command line with ffplay. I am trying to play it from media player. After little bit search I found that, I need to remux it to mp4 file after encoding. The examples that I reference for my project are official ffmpeg example and leandromoreira's code. However, avio_open() parts returns -13 as error. I printed out with av_make_error_string(error, sizeof(error), response) and got Permission denied. When I look for that error in the error.h
there is no such an error defined.

  


• Outputting file details using ffprobe in ffmpeg AWS Lambda layer

  17 février 2021, par Gracie

  I am trying to output the details of an audio file with ffmpeg using the ffprobe option. But it is just returning 'null' at the moment ? I have added the ffmpeg layer in Lambda. can anyone spot why this is not working ?

  



  const { spawnSync } = require("child_process");
const { readFileSync, writeFileSync, unlinkSync } = require("fs");
const util = require('util');
var fs = require('fs');
let path = require("path");

exports.handler = (event, context, callback) => {

    spawnSync(
        "/opt/bin/ffprobe",
        [
            `var/task/myaudio.flac`
        ],
        { stdio: "inherit" }
        );
};


  



  This is the official AWS Lambda layer I am using, it is a great prooject but a little lacking in documentation.

  



  https://github.com/serverlesspub/ffmpeg-aws-lambda-layer