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• ffmpeg output to stdout is a black box (python)

  27 juillet 2022, par dwilliams

  Project Background :
The project I'm working on takes an image from a UE simulation camera, uses OpenCV to convert the image to .jpg, and streams the .jpg to a localhost port so that a second program can retrieve the images and annotate the objects in the simulation. I am attempting to convert these to a suitable format for UE4's WmfMediaPlayer via ffmpeg so that it can be streamed to another localhost port.

  


  Problem :
I have managed to get a the stream active but the video at the end of stream is a black square. I'm confident but not 100% certain that I've setup the ffmpeg correctly. The output to console seem to imply that the conversion is working but I've been fooled before. It could also be the flask yield component.

  


  ffmpeg declaration/setup :

  


  process = (
        ffmpeg
        .input('C:/MOT/test.jpg')   
        .output('pipe:1', vcodec='libx264', format='avi')   
        .overwrite_output()
        .run_async(pipe_stdin=True, pipe_stdout=True)
    )


  


  Flask Integration :

  


  @app.route('/annotated')
def annotated():
    return Response(
        frame_generator_annotated(),
        mimetype='multipart/x-mixed-replace; boundary=frame'
    )


def frame_generator_annotated():
    global process
    while (True):
        frame = process.stdout.read()
        yield (b'--frame\r\n'
               b'Content-Type: video/avi\r\n\r\n' + frame + b'\r\n\r\n')


  


  stream view :
http://localhost:5001/annotated

  


  ffmpeg console output :

  


  Running on all addresses.
   WARNING: This is a development server. Do not use it in a production deployment.
 * Running on http://192.168.1.220:5001/ (Press CTRL+C to quit)
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[mjpeg @ 00000269be0faec0] EOI missing, emulating
Input #0, image2, from 'C:/MOT/test.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 1968 kb/s
    Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 1024x576 [SAR 1:1 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 00000269be0fc240] using SAR=1/1
[libx264 @ 00000269be0fc240] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 00000269be0fc240] profile High, level 3.1, 4:2:0, 8-bit
Output #0, avi, to 'pipe:1':
  Metadata:
    ISFT            : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (H264 / 0x34363248), yuvj420p(pc), 1024x576 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=28.0 Lsize=       2kB time=00:00:00.04 bitrate= 447.2kbits/s speed= 2.9x    
video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 157.307251%
[libx264 @ 00000269be0fc240] frame I:1     Avg QP:13.00  size:   869
[libx264 @ 00000269be0fc240] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 00000269be0fc240] 8x8 transform intra:0.0%
[libx264 @ 00000269be0fc240] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0%
[libx264 @ 00000269be0fc240] i16 v,h,dc,p: 97%  0%  3%  0%
[libx264 @ 00000269be0fc240] i8c dc,h,v,p: 100%  0%  0%  0%
[libx264 @ 00000269be0fc240] kb/s:173.80


  


• How to download multiple videos from an input ".txt" file with ".m3u8" links through FFMPEG and GPU acceleration

  16 février 2023, par Fab98

  I have a file .txt which contains multiple source links like :

  


  https://videosource1.m3u8

https://videosource2.m3u8


  


  .

  


  .

  


  .

  


  And I want to download all of them using FFMPEG with a script/bash or any for/while cycle.

  


  I tried with this command but with no success, knowing I'm using GPU acceleration :

  


  for %i in (path_txt_file\file.txt\*.m3u8) do ffmpeg -i "%i" -c:v hevc_nvenc -rc constqp -qp 31 -c:a aac -b:a 64k -ac 1 "output_path\%~ni.mp4"

  


• Change youtube-dl download output (Windows)

  24 octobre 2019, par Inforcer25

  I hope you can help me.

  I am using youtube-dl on windows (youtube-dl.exe)
  Downloading the video works great and also just the audio. But what i want is for it to save the audio file in a different place eg. C :\Users*******\Desktop

  I made a batch file with this code :

  :audio
  
  cls
  
  echo.
  
  echo.
  
  echo Your audio vill be downloaded and saved as a .mp3 format
  
  echo.
  
  echo.
  
  set /p audio=Enter Video URL here:
  
  cls
  
  youtube-dl.exe --extract-audio --audio-format mp3 --output C:\Users\*******\Desktop\(ext)s.%(ext)s %audio%
  
  pause
  
  cls
  
  echo.
  
  echo.
  
  echo.
  
  echo.
  
  echo Your audio has now been downloaded.
  
  ping localhost -n 3 >nul
  
  exit

  and then it gives me this

  Usage: youtube-dl.exe [OPTIONS] URL [URL...]
  
  
  
  youtube-dl.exe: error: You must provide at least one URL.
  
  Type youtube-dl --help to see a list of all options.
  
  Press any key to continue . . .

  It works fine if i use this but it saves it in the same folder.

  :audio
  
  cls
  
  echo.
  
  echo.
  
  echo Your audio vill be downloaded and saved as a .mp3 format
  
  echo.
  
  echo.
  
  set /p audio=Enter Video URL here:
  
  cls
  
  youtube-dl.exe --extract-audio --audio-format mp3 %audio%
  
  pause
  
  cls
  
  echo.
  
  echo.
  
  echo.
  
  echo.
  
  echo Your audio has now been downloaded.
  
  ping localhost -n 3 >nul
  
  exit

  Also please keep in mind that it also uses ffprobe.exe and ffmpeg.exe (They are both in the same folder as youtube-dl.exe