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• FFmpeg watermark duration

  4 mai 2016, par user2364292

  I am developing an Android app, which will work with FFmpeg library which only applies multiple watermarks on some test.mp4 video. For that case I am using the Android java library for FFmpeg binary from that source : [http://writingminds.github.io/ffmpeg-android-java/] which is working fine for some examples, but I just can not use commands like these :

  -i /storage/emulated/0/Download/test.mp4 -vf "movie=/storage/emulated/0/Download/test.mp4 [logo]; [in][logo] overlay=W-w-10:H-h-10, fade=in:0:20 [out]" /storage/emulated/0/Download/test.mp4

  Please note these quotes after -vf flag and these [in], [logo] flags. These just throw me an errors like

  [NULL @ 0xb5bf3200] Unable to find a suitable output format for '[logo];'
  
  [logo];: Invalid argument

  and so on. The quotes in the command are also the problem which throws me an error like :

  [AVFilterGraph @ 0xb5c092c0] No such filter: 'overlay=main_w-50:main_h-50,overlay=0:0'
  
  Error initializing complex filters.
  
  Invalid argument".

  Am I even using proper library for that case ? I also want to show the watermark in specific duration of the video. For example if video is 10 seconds long, I only want watermark to be shown starting from 3rd second of the video to 7th second. I can show the overlay images like this :

  -i /storage/emulated/0/Download/test.mp4 -i /storage/emulated/0/Download/test.jpg -i /storage/emulated/0/Download/test.jpg -filter_complex overlay=main_w-50:main_h-50,overlay=0:0 -codec:a copy /storage/emulated/0/Download/test_edited.mp4

  but they’re shown for the whole video duration. Where can I set the duration start/end for the specific overlay ?

  Thank you very much !

• 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 !

  


• FFmpeg stops temporarily when downloading HLS segment files

  9 mai 2022, par Nemdr

  I am downloading a video from a website in the HLS (M3U8) format, by downloading the segment (.ts) files. I am not re-encoding, but just copying the codecs, the command that I use :

  


  ffmpeg -user_agent "my ua" -referer "my referer" -i https://website/file.m3u8 -c copy outputfile.mp4 


  


  Sometimes the download suddenly stops in the middle of the download, and after a few seconds or a minute, it resumes. I am thinking that perhaps this has to do with the speed at which I am downloading, maybe the CDN temporarily rate limits me ?

  


  I have tried using this option : -http_multiple 0 to use only 1 HTTP connection to download the segment files, but this happens sometimes with this option as well. What could be the reason behind the sudden pauses ? And is there something I can do to slow down the download speed ? I have tried using the -re option as well, which downloads the segments at the native speed as if I'm watching the video, but that's too slow.

  


  Another possibility is that ffmpeg cannot find the next segment files, because the segment files in the .m3u8 manifest file are relative URLs, not full URLs, so ffmpeg has to search for the URL ??