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• Django api returns Gif as JPG despite a function to add it as video

  7 septembre 2023, par Earthling

  I'm trying to upload a .gif to my django 3.2 api. I have already ran troubleshoots through Postman and came to the conclusion that my flutter app sends it as a .gif and it gets returned as a .jpg. The problem is on the backend. Here is my relevant code which checks for file_meme subtype and then the function should convert the incoming .gif to a video :

  


  


  


  def add_media(self, file, order=None):
    check_can_add_media(post=self)

    is_in_memory_file = isinstance(file, InMemoryUploadedFile) or isinstance(file, SimpleUploadedFile)

    if is_in_memory_file:
        file_mime = magic.from_buffer(file.read())
    elif isinstance(file, TemporaryUploadedFile):
        file_mime = magic.from_file(file.temporary_file_path())
    else:
        file_mime = magic.from_file(file.name)

    check_mimetype_is_supported_media_mimetypes(file_mime)
    # Mime check moved pointer
    file.seek(0)

    file_mime_types = file_mime.split('/')

    file_mime_type = file_mime_types[0]
    file_mime_subtype = file_mime_types[1]

    temp_files_to_close = []

    if file_mime_subtype == 'gif':
                if is_in_memory_file:
                    file = write_in_memory_file_to_disk(file)

                temp_dir = tempfile.gettempdir()
                converted_gif_file_name = os.path.join(temp_dir, str(uuid.uuid4()) + '.mp4')

                ff = ffmpy.FFmpeg(
                    inputs={file.temporary_file_path() if hasattr(file, 'temporary_file_path') else file.name: None},
                    outputs={converted_gif_file_name: None})
                ff.run()
                converted_gif_file = open(converted_gif_file_name, 'rb')
                temp_files_to_close.append(converted_gif_file)
                file = File(file=converted_gif_file)
                file_mime_type = 'video'

            has_other_media = self.media.exists()
    
    if file_mime_type == 'image':
        post_image = self._add_media_image(image=file, order=order)
        if not has_other_media:
            self.media_width = post_image.width
            self.media_height = post_image.height
            self.media_thumbnail = file

    elif file_mime_type == 'video':
        post_video = self._add_media_video(video=file, order=order)
        if not has_other_media:
            self.media_width = post_video.width
            self.media_height = post_video.height
            self.media_thumbnail = post_video.thumbnail.file
    else:
        raise ValidationError(
            _('Unsupported media file type')
        )

    for file_to_close in temp_files_to_close:
        file_to_close.close()
            
            
    self.save()        

  


  


  



  def _add_media_image(self, image, order):
    return PostImage.create_post_media_image(image=image, post_id=self.pk, order=order)

def _add_media_video(self, video, order):
    return PostVideo.create_post_media_video(file=video, post_id=self.pk, order=order)


@classmethod
    def create_post_media_image(cls, image, post_id, order):
        hash = sha256sum(file=image.file)
        post_image = cls.objects.create(image=image, post_id=post_id, hash=hash, thumbnail=image)
        PostMedia.create_post_media(type=PostMedia.MEDIA_TYPE_IMAGE,
                                    content_object=post_image,
                                    post_id=post_id, order=order)
        return post_image


@classmethod
    def create_post_media_video(cls, file, post_id, order):
        hash = sha256sum(file=file.file)
        video_backend = get_backend()

        if isinstance(file, InMemoryUploadedFile):
            # If its in memory, doing read shouldn't be an issue as the file should be small.
            in_disk_file = write_in_memory_file_to_disk(file)
            thumbnail_path = video_backend.get_thumbnail(video_path=in_disk_file.name, at_time=0.0)
        else:
            thumbnail_path = video_backend.get_thumbnail(video_path=file.file.name, at_time=0.0)

        with open(thumbnail_path, 'rb+') as thumbnail_file:
            post_video = cls.objects.create(file=file, post_id=post_id, hash=hash, thumbnail=File(thumbnail_file), )
        PostMedia.create_post_media(type=PostMedia.MEDIA_TYPE_VIDEO,
                                    content_object=post_video,
                                    post_id=post_id, order=order)
        return post_video
        
    


  


  I'm not sure where the problem is. From my limited understanding, it is taking only the first frame of the .gif and uploading it as an image.

  


• How do I combine PyTube audio and video streams in a Flask app and let the user download as one file without storing on the web server ?

  10 avril 2022, par AJB9384

  I'm building a YouTube downloader as a side project in Flask. It allows users to input a url and download the video without storing anything on the server I'm hosting on

  


  Lower quality videos can be sent to the user easily as they from PyTube as one file. I use the code below :

  


  import os
import flask
from flask import redirect, url_for, session, send_file
import requests

import pytube
from pytube import YouTube
from io import BytesIO

@app.route('/pull_videos', methods = ['GET', 'POST'])
def pull_videos(): 
  buffer=BytesIO()
  yt_test=YouTube('https://www.youtube.com/watch?v=NNNPgIfK2YE')
  video = yt_test.streams.get_by_itag(251)

  video.stream_to_buffer(buffer)
  buffer.seek(0)

  return send_file(buffer, as_attachment=True, download_name="Test video")


  


  However, I struggle when trying to pull in higher quality videos as they come in as separate audio and videos streams (see documentation here : https://pytube.io/en/latest/user/streams.html#)

  


  I am trying to use ffmpeg to combine the two and then send to the user, but the code below isn't working as expected and throws an error :

  


  Code :

  


  import os
import flask
from flask import redirect, url_for, session, send_file
import requests
import ffmpeg

import pytube
from pytube import YouTube
from io import BytesIO

@app.route('/pull_videos', methods = ['GET', 'POST'])
def pull_videos(): 
  buffer=BytesIO()
  
  video = yt_test.streams.get_by_itag(137)
  input_video = ffmpeg.input(video)
  
  audio = yt_test.streams.get_by_itag(137)
  input_audio = ffmpeg.input(audio)
  
  combined = ffmpeg.concat(input_video, input_audio, v=1, a=1)
  combined.stream_to_buffer(buffer)
  buffer.seek(0)

  return send_file(buffer, as_attachment=True, download_name="Test video")


  


  Error : AttributeError : 'FilterableStream' object has no attribute 'stream_to_buffer'

  


  How could I combine these audio and video streams from PyTube into one file for the user to download without storing on the server ?

  


• How do I use gpg to verify an ffmpeg source snapshot download ? [closed]

  2 novembre 2024, par Neddie

  I downloaded two files :

  


  ffmpeg-snapshot.tar.bz2
ffmpeg-devel.asc


  


  The .asc file looks like this :

  


  -----BEGIN PGP PUBLIC KEY BLOCK-----

  


  mQENBE22rV0BCAC3DzRmA2XlhrqYv9HKoEvNHHf+PzosmCTHmYhWHDqvBxPkSvCl
...
+x8ETJgPoNK3kQoDagApj4qAt83Ayac3HzNIuEJ7LdvfINIOprujnJ9vH4n04XLg
I4EZ
=Rjbw
-----END PGP PUBLIC KEY BLOCK-----

  


  The command

  


  gpg --show-keys ffmpeg-devel.asc


  


  gives

  


  pub   rsa2048 2011-04-26 [SC]
      FCF986EA15E6E293A5644F10B4322F04D67658D8
uid                      FFmpeg release signing key <ffmpeg-devel@ffmpeg.org>
sub   rsa2048 2011-04-26 [E]


  


  The command

  


  gpg --verify ffmpeg-devel.asc ffmpeg-snapshot.tar.bz2


  


  gives output

  


  gpg: verify signatures failed: Unexpected error


  


  I tried decompressing the bz2 file and then

  


  gpg --verify ffmpeg-devel.asc ffmpeg-snapshot.tar


  


  and got the same error.

  


  What am I missing ?