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• No such file or directory error in flutter_ffmpeg

  8 septembre 2021, par Aryan Shandilya

  I intend to use the flutter_ffmpeg package to convert audio to video with the image as a background, but I am encountering a very weird error. Despite the fact that the files exist in the location that I have provided to the flutter_ffmpeg package as input, I am getting a 'No such file or directory' error. I have already tested out everything I can thnk of but I just don't get it.

  


  Future<string> converter(String audioPath, String imagePath) async {&#xA;String? videoPath;&#xA;Directory? dir = await getExternalStorageDirectory();&#xA;// videoPath = dir!.path;&#xA;final videoDirectory = &#x27;${dir!.path}/VDir&#x27;;&#xA;if (await Directory(videoDirectory).exists() == false) {&#xA;  await Directory(videoDirectory).create();&#xA;}&#xA;// await Directory(videoDirectory).create();&#xA;videoPath = videoDirectory &#x2B; &#x27;/${DateTime.now().millisecond}.mp4&#x27;;&#xA;print(&#xA;    "-------------------------------------------------------------------------------------------------------------------------------------------------------------------");&#xA;print("\nAudioPath = " &#x2B; audioPath);&#xA;print("\nImagePath = " &#x2B; imagePath);&#xA;print("\nVideoPath = " &#x2B; videoPath);&#xA;print("\nVideoDirectory = " &#x2B; videoDirectory);&#xA;print(&#xA;    "\n-------------------------------------------------------------------------------------------------------------------------------------------------------------------");&#xA;_flutterFFmpeg&#xA;    .execute(&#xA;        &#x27;-loop 1 -framerate 2 -i \&#x27;$imagePath\&#x27; -i \&#x27;$audioPath\&#x27; -vf "scale=2*trunc(iw/2):2*trunc(ih/2),setsar=1" -c:v libx264 -preset medium -tune stillimage -crf 18 -c:a copy -shortest -pix_fmt yuv420p $videoPath&#x27;)&#xA;    .catchError((onError) {&#xA;  print(onError);&#xA;  // ErrorHandler().errorDialog(context, )&#xA;});&#xA;return videoPath;}&#xA;</string>

  


  videoPath = await FFmpegOperations().converter(widget.audioPath, coverImagePath);

  


  Can someone tell me what is wrong with my code, I am using the min-gpl version(not lts) ffmpeg and am testing this on two android devices I am getting the same results.

  


  Error :
/data/user/0/com.example.example/app_flutter/datte.png : No such file or directory
D/flutter-ffmpeg( 1139) : FFmpeg exited with rc : 1
.
Any form of help would be more than welcome, thank you.

  


• Rails : Paperclip produces different results for similar videos

  10 décembre 2016, par Polyov

  I am using the Paperclip Gem to handle video uploads on my Rails app. I’ve followed the instructions in a few other stackoverflow questions and external tutorials to get video uploads working. However, currently there is a strange glitch with the system that I don’t understand.

  When uploading two different videos, the app will be able to show a thumbnail and no video for one upload, and no thumbnail but video for another one.

  Both videos use the same codecs, are around the same length, but are a bit different in their dimensions & file size.

  

  When I upload them, test1 has a thumbnail, but my browser will not load the video file. It exists in my file system but Chrome will not play it.

  The opposite happens for test2. Its thumbnail in my file system is zero bytes, but the video loads fine in my browser.

  Here are the paperclip upload parameters for my object :

  has_attached_file :video, :styles => {
  
      :medium => { :format => 'mp4' },
  
      :thumb => { :geometry => "500x500#", :format => 'jpg', :time => 10 }
  
    }, :processors => [:transcoder]
  
  validates_attachment_presence :video
  
  validates_attachment :video, content_type: { content_type: ["video/mp4", "video/mov", "video/wav", "video/wmv"] }

  I’ve created a Github repo with an example app that reproduces the issue, at least on my system.

• Libavcodec and QuickSync

  15 février 2016, par FrancescoBLT

  I’m attempting to encode in h264 format using libavcodec with and without QuickSync hardware acceleration. If I don’t use the hw acceleration is quite simple :

  ff_codec = avcodec_find_encoder(AV_CODEC_ID_H264) ;

  ff_cdctx = avcodec_alloc_context3(ff_codec) ;

  ff_cdctx->width = 1920;
  
  ff_cdctx->height = 1080;
  
  ff_cdctx->time_base.num = 1;
  
  ff_cdctx->time_base.den = 25;
  
  ff_cdctx->sample_aspect_ratio.num = 16;
  
  ff_cdctx->sample_aspect_ratio.den = 9;
  
  ff_cdctx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  av_dict_set(&param,"profile","main",0);
  
  av_dict_set(&param,"preset","medium",0);
  
  av_dict_set(&param,"tune","film",0)<0);
  
  ff_cdctx->gop_size = 10;
  
  ff_cdctx->max_b_frames = 1;
  
  opres = avcodec_open2(ff_cdctx,ff_codec,&param);
  
  ff_frame = av_frame_alloc();
  
  ff_frame->format = ff_cdctx->pix_fmt;
  
  ff_frame->width  = ff_cdctx->width;
  
  ff_frame->height = ff_cdctx->height; 
  
  
  
  opres = av_image_alloc(ff_frame->data, ff_frame->linesize,ff_cdctx->width,ff_cdctx->height,ff_cdctx->pix_fmt, 32);
  
  ff_frame->linesize[0] = ff_cdctx->width;
  
  ff_frame->linesize[1] = ff_frame->linesize[2] = ff_cdctx->width>>1;
  
  
  
  ff_frame->sample_aspect_ratio.num = ff_cdctx->sample_aspect_ratio.num;
  
  ff_frame->sample_aspect_ratio.den = ff_cdctx->sample_aspect_ratio.den;
  
  av_init_packet(&pkt);
  
  enc_err = avcodec_encode_video2(ff_cdctx,&pkt,ff_frame,&got_pkt);  }

  And so on for all source frame. Problem arise when I attempt to use hardware
  acceleration. In this case I use :

  ff_codec = avcodec_find_encoder_by_name("h264_qsv") ;
  for gathering the codec. But when I attempt to open it, the result is "invalid parameter" :
  opres = avcodec_open2(ff_cdctx,ff_codec,&param) ;
  if(opres<0)
  
  if(av_strerror(opres,err_str,256)==0) OutputDebugStringA(err_str) ;
  return -6 ;
  
  Did anyone have attempted to use QuickSync from code ? In the examples there is only one file (qsvdec.c) and is for decoding, not for encoding.
  regards