Recherche avancée

Sur d’autres sites (7724)

• Difficulty getting the expected output for .avi conversions to .mp4 using FFMPEG [closed]

  25 avril 2024, par Ericel

  I am trying to write a video converting script that converts an input video file to .mp4 output. I am using ffmpeg libx264 encoder. Unfortunately, when I convert from .avi to .mp4, the output video is not smooth, a little skippy. Here is how I set up the encoder code :

  


  AVCodecContext *Video::setupVideoEncoder(const AVCodec *encoder, AVStream *inVideoStream, AVFormatContext *outFormatCtx)&#xA;{&#xA;    AVCodecContext *codecCtx = avcodec_alloc_context3(encoder);&#xA;    if (!codecCtx)&#xA;    {&#xA;        std::cerr &lt;&lt; "Failed to allocate the video codec context." &lt;&lt; std::endl;&#xA;        return nullptr;&#xA;    }&#xA;&#xA;    if (avcodec_parameters_to_context(codecCtx, inVideoStream->codecpar) &lt; 0)&#xA;    {&#xA;        std::cerr &lt;&lt; "Failed to copy codec parameters to encoder context." &lt;&lt; std::endl;&#xA;        avcodec_free_context(&amp;codecCtx);&#xA;        return nullptr;&#xA;    }&#xA;&#xA;    // Correctly assign pixel format based on encoder support&#xA;    if (!check_pix_fmt(encoder, inVideoStream->codecpar->format))&#xA;    {&#xA;        codecCtx->pix_fmt = encoder->pix_fmts[0];&#xA;    }&#xA;    else&#xA;    {&#xA;        codecCtx->pix_fmt = static_cast<avpixelformat>(inVideoStream->codecpar->format);&#xA;    }&#xA;    codecCtx->width = inVideoStream->codecpar->width;&#xA;    codecCtx->height = inVideoStream->codecpar->height;&#xA;    codecCtx->bit_rate = 2000000; // 2 Mbps&#xA;    codecCtx->gop_size = 12;&#xA;    codecCtx->max_b_frames = 3;&#xA;&#xA;    // Setting frame rate and time base using guessed values&#xA;    AVRational framerate = av_guess_frame_rate(outFormatCtx, inVideoStream, nullptr);&#xA;    codecCtx->framerate = framerate;&#xA;    codecCtx->time_base = av_inv_q(framerate);&#xA;&#xA;    AVDictionary *opts = nullptr;&#xA;    av_dict_set(&amp;opts, "x264-params", "keyint=25:min-keyint=25:no-scenecut=1", 0);&#xA;&#xA;    if (outFormatCtx->oformat->flags &amp; AVFMT_GLOBALHEADER)&#xA;    {&#xA;        codecCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;&#xA;    }&#xA;&#xA;    if (avcodec_open2(codecCtx, encoder, &amp;opts) &lt; 0)&#xA;    {&#xA;        std::cerr &lt;&lt; "Failed to open the video encoder." &lt;&lt; std::endl;&#xA;        avcodec_free_context(&amp;codecCtx);&#xA;        av_dict_free(&amp;opts);&#xA;        return nullptr;&#xA;    }&#xA;&#xA;    av_dict_free(&amp;opts);&#xA;    return codecCtx;&#xA;} &#xA;</avpixelformat>

  


  I can only thing the configurations here are the problem, because if I converted a .mov to .mp4, I get the expected output.

  


• A basic query about video editing libraries and algorithms

  8 janvier 2021, par Education 4Fun

  I'm working with FFmpeg for a project so as per our college guidelines we need to write one research paper so I was confused about what to write
so I thought of writing a comparison of different video editing libraries as per my knowledge I just found FFmpeg if u know any other libraries/algorithms
or any suggestions for writing a research paper on ffmpeg
please let me know
sorry for asking here
Thank you

  


• Set up basic Batch or Node.JS prompts for FFMPEG ?

  18 août 2016, par ErraticFox

  I have some game clips from Nvidia shadow play that I like to casually shorten and / or turn them into webms or keep them as mp4s. I use the same ffmpeg line for them. I do slightly change the line because of the input file, start time, and output file.

  How could I set up something like a batch file (I was thinking maybe node as well) where it just asks for the input file, start time, and output file ?

  The current ffmpeg command line I use is like this :
  ffmpeg -i desktop.mp4 -ss 00:01:50 -b 900000 -vf scale=640:trunc(ow/a/2)*2 output.webm