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• Capture raw video byte stream for real time transcoding

  9 septembre 2012, par user1145905

  I would like to achieve the following :

  Set up a proxy server to handle video requests by clients (for now, say all video requests from any Android video client) from a remote video server like YouTube, Vimeo, etc. I don't have access to the video files being requested, hence the need for a proxy server. I have settled for Squid. This proxy should process the video signal/stream being passed from the remote server before relaying it back to the requesting client.

  To achieve the above, I would either

  1. Need to figure out the precise location (URL) of the video resource being requested, download it really fast, and modify it as I want before HTTP streaming it back to the client as the transcoding continues (simultaneously, with some latency)

  2. Access the raw byte stream, pipe it into a transcoder (I'm thinking ffmpeg) and proceed with the streaming to client (also with some expected latency).

  Option #2 seems tricky to do but lends more flexibility to the kind of transcoding I would like to perform. I would have to actually handle raw data/packets, but I don't know if ffmpeg takes such input.

  In short, I'm looking for a solution to implement real-time transcoding of videos that I do not have direct access to from my proxy. Any suggestions on the tools or approaches I could use ? I have also read about Gstreamer (but could not tell if it's applicable to my situation), and MPlayer/MEncoder.

  And finally, a rather specific question : Are there any tools out there that, given a YouTube video URL, can download the byte stream for further processing ? That is, something similar to the Chrome YouTube downloader but one that can be integrated with a server-side script ?

  Thanks for any pointers/suggestions !

• Command of FFMPEG to make a video from Image(JPEG) + Audio(.mp3) & Share video in Whatsapp

  22 novembre 2018, par Neel Mevada

  I am trying to create a video .mp4 file from .mp3 audio & .jpeg image.

  I am able to make a video and able to play in Video Players in Android devices.

  But after creation of file when i tried to Share that Video in Whatsapp, at that time it shows a message "The file format not supported".

  I am using below FFMPEG Command :

  "-loop 1 -r 1 -i " + imageFilePath + " -i " + audioFilePath + " -c:v libx264 -crf 27 -tune stillimage -c:a copy -pix_fmt yuv420p -preset ultrafast -shortest " + pathOutputVideo(sectionName);

  And for Sharing video , i am using below Code :

    MediaScannerConnection.scanFile(ShareQuestionAudioActivity.this, new String[]{FfmpegController.pathOutputVideo(qModel.getSectionName().toUpperCase().replaceAll(" ", "_"))},
  
                  null, new MediaScannerConnection.OnScanCompletedListener() {
  
                      public void onScanCompleted(String path, Uri uri) {
  
                          Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND);
  
                          shareIntent.setType("video/*");
  
                          shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse(FfmpegController.pathOutputVideo(qModel.getSectionName().toUpperCase().replaceAll(" ", "_"))));
  
                          startActivity(Intent.createChooser(shareIntent, "Share Question"));
  
                      }
  
                  });

  From this Link I found that i need to use H264 + AAC. but still not able to share video with supported file format

• ffmpeg play short video during playing another video

  10 mai 2016, par Szymek Świderski

  I want put and play scrap of short video during play another video in ffmpeg. I use this : ffmpeg -i 0.mp4 -i "prawo.mp4" -filter_complex "blend=all_mode='heat':all_opacity=0.3" output.mp4

  and i get this :

  First input link top parameters (size 1280x720, SAR 0:1) do not match the corresponding second input link bottom parameters (1920x1080, SAR 1:1)

  What should i do ? Any help ?