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• 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 !

  


• Capture camera + mic and encode to h264/aac on macOS

  16 décembre 2018, par Flock Dawson

  I’m having trouble capturing and encoding audio+video on-the-fly on macOS.

  I tried two options :

  1. ffmpeg

     ffmpeg -threads 0 -f avfoundation -s 1920x1080 -framerate 25 -I 0:0 -async 441 -c:v libx264 -preset medium -pix_fmt yuv420p -crf 22 -c:a libfdk_aac -aq 95 -y

  2. gstreamer

     gst-launch-1.0 -ve avfvideosrc device-index=0 ! video/x-raw,width=1920,height=1080,framerate=25/1 ! vtenc_h264 ! queue ! mp4mux name=mux ! filesink location=out.mp4  osxaudiosrc device=0 ! audio/x-raw ! faac midside=false ! queue ! mux.

  The ffmpeg option works, but only for lower resolutions. With higher resolutions, the Mac mini (2018 gen) can’t do the heavy lifting. I think because I installed ffmpeg with brew, so it wasn’t compiled on my machine, meaning it doesn’t use the h264 hardware encoder in the Mac ?

  The gstreamer option works as well, but there’s a slight audio/video sync issue (audio is 100ms ahead of the video). I can’t seem to add delay to the GStreamer queue (it ignores it) :

  queue max-size-buffers=0 max-size-time=0 max-size-bytes=0 min-threshold-time=100000000

  Anyone who has any experience with this ? Thanks !

• ffmpeg video slideshow only takes first image

  14 décembre 2018, par Erhan

  I wanted to create an .mp4 video with a framerate of 1 fps out of 10 images. I followed https://trac.ffmpeg.org/wiki/Slideshow and got to (my images are in the folder I am running the command from and are name img000.png, img001.png, etc.)

  path_to_ffmpeg\ffmpeg.exe -framerate 1 -i img%03d.png output.mp4

  However only the first image is taken to the video and it only shows one image !

  After trying multiple permutations of -framerate and -r options and positions of the options, I did not recieve any better results.

  Does anyone know what might have gone wrong even in this simple case ? Thanks.

  Full log :

  C:\Users\foo\Documents\path>C:\bar\ffmpeg-4.0.2-win64-static\bin\ffmpeg.ex
  
  e -framerate 1 -i img%03d.png output.mp4    
  
  ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers    
  
    built with gcc 7.3.1 (GCC) 20180722    
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --e    
  
  nable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libblur    
  
  ay --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-    
  
  libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enab    
  
  le-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-li    
  
  bvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --en    
  
  able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-    
  
  libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enabl    
  
  e-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enabl    
  
  e-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enab    
  
  le-dxva2 --enable-avisynth    
  
    libavutil      56. 14.100 / 56. 14.100    
  
    libavcodec     58. 18.100 / 58. 18.100    
  
    libavformat    58. 12.100 / 58. 12.100    
  
    libavdevice    58.  3.100 / 58.  3.100    
  
    libavfilter     7. 16.100 /  7. 16.100    
  
    libswscale      5.  1.100 /  5.  1.100    
  
    libswresample   3.  1.100 /  3.  1.100    
  
    libpostproc    55.  1.100 / 55.  1.100    
  
  Input #0, image2, from 'img%03d.png':    
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: N/A    
  
      Stream #0:0: Video: png, rgba(pc), 959x550 [SAR 2834:2834 DAR 959:550], 1 fp    
  
  s, 1 tbr, 1 tbn, 1 tbc    
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y    
  
  Stream mapping:    
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))    
  
  Press [q] to stop, [?] for help    
  
  [libx264 @ 0000000000611040] using SAR=1/1    
  
  [libx264 @ 0000000000611040] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2    
  
  AVX FMA3 BMI2 AVX2    
  
  [libx264 @ 0000000000611040] profile High 4:4:4 Predictive, level 3.1, 4:4:4 8-b    
  
  it    
  
  [libx264 @ 0000000000611040] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC cod    
  
  ec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 r    
  
  ef=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed    
  
  _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pski    
  
  p=1 chroma_qp_offset=4 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 deci    
  
  mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_    
  
  adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=1    
  
  scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60    
  
  qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00    
  
  Output #0, mp4, to 'output.mp4':    
  
    Metadata:    
  
      encoder         : Lavf58.12.100    
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 959x550 [SA    
  
  R 1:1 DAR 959:550], q=-1--1, 1 fps, 16384 tbn, 1 tbc    
  
      Metadata:    
  
        encoder         : Lavc58.18.100 libx264    
  
      Side data:    
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1    
  
  frame=   10 fps=0.0 q=-1.0 Lsize=      20kB time=00:00:07.00 bitrate=  23.1kbits    
  
  /s speed=68.6x    
  
  video:19kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing ov    
  
  erhead: 5.046419%    
  
  [libx264 @ 0000000000611040] frame I:1     Avg QP: 4.41  size: 14084    
  
  [libx264 @ 0000000000611040] frame P:3     Avg QP:12.31  size:   632    
  
  [libx264 @ 0000000000611040] frame B:6     Avg QP:19.11  size:   436    
  
  [libx264 @ 0000000000611040] consecutive B-frames: 20.0%  0.0%  0.0% 80.0%    
  
  [libx264 @ 0000000000611040] mb I  I16..4: 89.7%  0.0% 10.3%    
  
  [libx264 @ 0000000000611040] mb P  I16..4:  0.2%  0.0%  0.1%  P16..4:  0.5% 0.1    
  
  %  0.1%  0.0%  0.0%    skip:98.9%    
  
  [libx264 @ 0000000000611040] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.6%  0.1    
  
  %  0.1%  direct: 0.0%  skip:99.1%  L0:22.0% L1:73.7% BI: 4.3%    
  
  [libx264 @ 0000000000611040] coded y,u,v intra: 6.1% 2.5% 2.6% inter: 0.2% 0.1%    
  
  0.1%    
  
  [libx264 @ 0000000000611040] i16 v,h,dc,p: 72% 25%  3%  0%    
  
  [libx264 @ 0000000000611040] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 31% 20%  2%  2%    
  
  2%  3%  5%  2%    
  
  [libx264 @ 0000000000611040] Weighted P-Frames: Y:0.0% UV:0.0%    
  
  [libx264 @ 0000000000611040] ref P L0: 65.8%  1.5% 26.5%  6.1%    
  
  [libx264 @ 0000000000611040] ref B L0: 77.0% 12.7% 10.3%    
  
  [libx264 @ 0000000000611040] ref B L1: 88.6% 11.4%
  
  [libx264 @ 0000000000611040] kb/s:14.87