Recherche avancée

Sur d’autres sites (7185)

• Insert trimmed audio into a video with FFMPEG

  3 octobre 2017, par Helder Santos

  Lately I’ve had to work a bit with FFMPEG, and sometimes I struggled trying to understand which commands/filters I should use to achieve my goals, this post serves only to share the knowledge I acquired in the process, specifically in the process of manipulating an audio file and inserting it onto a video.

  I needed to replace the audio of a video with a new audio file, at a specific location, and with a specific duration, preferably having a fade out on the audio when it ended, below is the solution to my problem and its explanation.

  I should also mention, some part of the knowledge required for this was acquired
  by studying the answer provided by rajib in this post, so big thanks to him aswell !

• Flask send_file not sending file

  30 avril 2021, par jackmerrill

  I'm using Flask with send_file() to have people download a file off the server.

  



  My current code is as follows :

  



  @app.route('/', methods=["GET", "POST"])
def index():
    if request.method == "POST":
        link = request.form.get('Link')
        with youtube_dl.YoutubeDL(ydl_opts) as ydl:
            info_dict = ydl.extract_info(link, download=False)
            video_url = info_dict.get("url", None)
            video_id = info_dict.get("id", None)
            video_title = info_dict.get('title', None)
            ydl.download([link])
        print("sending file...")
        send_file("dl/"+video_title+".f137.mp4", as_attachment=True)
        print("file sent, deleting...")
        os.remove("dl/"+video_title+".f137.mp4")
        print("done.")
        return render_template("index.html", message="Success!")
    else:
        return render_template("index.html", message=message)


  



  The only reason I have .f137.mp4 added is because I am using AWS C9 to be my online IDE and I can't install FFMPEG to combine the audio and video on Amazon Linux. However, that is not the issue. The issue is that it is not sending the download request.

  



  Here is the console output :

  



  127.0.0.1 - - [12/Dec/2018 16:17:41] "POST / HTTP/1.1" 200 -
[youtube] 2AYgi2wsdkE: Downloading webpage
[youtube] 2AYgi2wsdkE: Downloading video info webpage
[youtube] 2AYgi2wsdkE: Downloading webpage
[youtube] 2AYgi2wsdkE: Downloading video info webpage
WARNING: You have requested multiple formats but ffmpeg or avconv are not installed. The formats won't be merged.
[download] Destination: dl/Meme Awards v244.f137.mp4
[download] 100% of 73.82MiB in 00:02
[download] Destination: dl/Meme Awards v244.f140.m4a
[download] 100% of 11.63MiB in 00:00
sending file...
file sent, deleting...
done.
127.0.0.1 - - [12/Dec/2018 16:18:03] "POST / HTTP/1.1" 200 -


  



  Any and all help is appreciated. Thanks !

  


• How to add moov atom to mp4 file that is uploaded to flask server

  12 avril 2021, par Drew Parmelee

  I have a flask web server that lets the user upload a video from an HTML form using the following endpoint :

  


  @app.route('/account', methods=['GET', 'POST'])
def account():

    uploadVideoForm = UploadVideoForm()
    if request.method == 'POST' and uploadVideoForm.validate():

        #  add moov atom to uploaded video

        db.put(uploadVideoForm.video.data)
        return redirect(url_for('account'))


  


  I need to prepare this uploaded video for progressive download streaming by adding a moov atom to the beginning of the file. How can this be accomplished ? Could be server-side, or in the users browser with js before they submit the form.

  


  I was able to add a moov atom to a .mp4 using :

  


  ffmpeg -i file.mp4 -c copy -map 0 -movflags +faststart out.mp4


  


  in the command line, but I'm not sure how this can be done on my server.

  


  I really appreciate any help,