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• Checking if a video has a sound even if it has an audio codec ?

  19 janvier 2023, par Sreenivasan

  I am new to intermediate python and I am trying to find if a downloaded video has sound, every video I download has an audio codec but I want to get the decibel of sound that audio has in that particular video.

  


  For example, this 'FFmpeg' command line script allows me to get the full info :

  


  ffmpeg -hide_banner -i testvideo.mp4 -af volumedetect -vn -f null - 2>&1


  


  this yields the below result in my command prompt(windows user here with win 11)

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testvideo.mp4':

Metadata:

major_brand : mp42

minor_version : 0

compatible_brands: mp42mp41isomavc1

creation_time : 2022-04-12T23:21:45.000000Z

Duration: 00:00:40.58, start: 0.000000, bitrate: 4104 kb/s

Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 3846 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default)

Metadata:

creation_time : 2022-04-12T23:21:45.000000Z

handler_name : L-SMASH Video Handler

vendor_id : [0][0][0][0]

encoder : AVC Coding

Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 253 kb/s (default)

Metadata:

creation_time : 2022-04-12T23:21:45.000000Z

handler_name : L-SMASH Audio Handler

vendor_id : [0][0][0][0]

Stream mapping:

Stream #0:1 -> #0:0 (aac (native) -> pcm_s16le (native))

Press [q] to stop, [?] for help

Output #0, null, to 'pipe:':

Metadata:

major_brand : mp42

minor_version : 0

compatible_brands: mp42mp41isomavc1

encoder : Lavf59.35.100

Stream #0:0(und): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s (default)

Metadata:

creation_time : 2022-04-12T23:21:45.000000Z

handler_name : L-SMASH Audio Handler

vendor_id : [0][0][0][0]

encoder : Lavc59.56.100 pcm_s16le

size=N/A time=00:00:40.55 bitrate=N/A speed=1.22e+03x

video:0kB audio:7608kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[Parsed_volumedetect_0 @ 0000026609be08c0] n_samples: 3895296

[Parsed_volumedetect_0 @ 0000026609be08c0] mean_volume: -91.0 dB

[Parsed_volumedetect_0 @ 0000026609be08c0] max_volume: -91.0 dB

[Parsed_volumedetect_0 @ 0000026609be08c0] histogram_91db: 3895296


  


  As you can see there are 'parsed_volumedetect' values with dB which has a mean value of -91 dB which means the audio has no sound, i.e., the video has audio but there is no sound.

  


  Now I am trying to do the same in python and I want to get just the mean volume value to be stored in a variable so that I can check if the video has any sound in it.

  


  I have seen the subprocess codes so far but when I try to run my code in VS-Code - python 3.11 :

  


  import subprocess    
result = subprocess.run(["ffmpeg", "-hide_banner", "-af", "volumedetect", "-vn", "-f", "null", "testvideo1.mp4"],
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT,
    shell=True)
    print(result.stdout)


  


  It says that :

  


  PS C:\Users\balaj\OneDrive\Documents\Programming language\python files> c:; cd 'c:\Users\balaj\OneDrive\Documents\Programming language\python files'; & 'C:\Python311\python.exe' 'c:\Users\balaj\.vscode\extensions\ms-python.python-2022.20.2\pythonFiles\lib\python\debugpy\adapter/../..\debugpy\launcher' '51760' '--' 'c:\Users\balaj\OneDrive\Documents\Programming language\python files\devproject\sample.py'

b"Output #0, null, to 'testvideo1.mp4':\r\nOutput file #0 does not contain any stream\r\n"


  


  Any help is much appreciated. Sorry for the long post... TIA !!!

  


  Just a quick update :
The result is the same for video files that have sound(I tested in VLC) and don't have sound.

  


  Another update :
I have changed the subprocess.runcode to the exact same as I called in the cmd windows :

  


  result = subprocess.run(["ffmpeg", "-hide_banner","-i","testvideo-sound.mp4", "-af", "volumedetect", "-vn", "-f", "null", "-2>&1"]


  


  Now the result is this :

  


  b'The handle could not be duplicated\r\nduring redirection of handle 1.\r\n'


  


• ffmpeg with Quick Sync Video (qsv) gets stuck

  28 avril 2023, par Juliano B. Nequirito

  I've compiled ffmpeg in an Arch Linux distribution with support to Intel Quick Sync Video. But ffmpeg gets stuck when I try to run it :

  


  $ ffmpeg -debug -hwaccel qsv -qsv_device /dev/dri/renderD128 -c:v h264_qsv -i test_video.mp4 -c:v hevc_qsv output.mp4

ffmpeg version N-109562-g0431f9805e Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (GCC)
  configuration: --prefix=/usr --extra-cflags=-I/opt/cuda/include --extra-ldflags=-L/opt/cuda/lib64 --enable-lto --disable-rpath --enable-gpl --enable-version3 --enable-nonfree --enable-shared --disable-static --disable-stripping --enable-gray --enable-alsa --enable-avisynth --enable-bzlib --enable-chromaprint --enable-frei0r --enable-gcrypt --enable-gmp --enable-gnutls --enable-iconv --enable-ladspa --enable-lcms2 --enable-libaom --enable-libaribb24 --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcelt --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libdavs2 --enable-libdc1394 --enable-libfdk-aac --enable-libflite --enable-fontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libiec61883 --enable-libilbc --enable-libjack --enable-libjxl --enable-libklvanc --enable-libkvazaar --enable-liblensfun --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-libopencv --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --disable-libopenvino --enable-libopus --enable-libplacebo --enable-libpulse --enable-librabbitmq --enable-librav1e --enable-librist --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libsvthevc --enable-libsvtvp9 --disable-libtensorflow --enable-libtesseract --enable-libtheora --disable-libtls --enable-libtwolame --enable-libuavs3d --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxavs2 --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-libxcb-shape --enable-libxvid --enable-libxml2 --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-lzma --enable-decklink --disable-mbedtls --enable-libmysofa --enable-openal --enable-opencl --enable-opengl --disable-openssl --enable-pocketsphinx --enable-sndio --enable-sdl2 --enable-vapoursynth --enable-vulkan --enable-xlib --enable-zlib --enable-amf --enable-cuda-nvcc --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-libdrm --enable-libvpl --enable-libnpp --enable-nvdec --enable-nvenc --enable-omx --enable-rkmpp --enable-v4l2-m2m --enable-vaapi --enable-vdpau
  libavutil      57. 43.100 / 57. 43.100
  libavcodec     59. 56.100 / 59. 56.100
  libavformat    59. 34.102 / 59. 34.102
  libavdevice    59.  8.101 / 59.  8.101
  libavfilter     8. 53.100 /  8. 53.100
  libswscale      6.  8.112 /  6.  8.112
  libswresample   4.  9.100 /  4.  9.100
  libpostproc    56.  7.100 / 56.  7.100
 matched as AVOption 'debug' with argument '-hwaccel'.
Reading option 'qsv' ... matched as output url.
Reading option '-qsv_device' ... matched as option 'qsv_device' (set QSV hardware device (DirectX adapter index, DRM path or X11 display name)) with argument '/dev/dri/renderD128'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264_qsv'.
Reading option '-i' ... matched as input url with argument 'test_video.mp4'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'hevc_qsv'.
Reading option 'output.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option qsv_device (set QSV hardware device (DirectX adapter index, DRM path or X11 display name)) with argument /dev/dri/renderD128.
[AVHWDeviceContext @ 0x5590d517ee40] libva: VA-API version 1.17.0
[AVHWDeviceContext @ 0x5590d517ee40] libva: User requested driver 'iHD'
[AVHWDeviceContext @ 0x5590d517ee40] libva: Trying to open /usr/lib/dri/iHD_drv_video.so
[AVHWDeviceContext @ 0x5590d517ee40] libva: Found init function __vaDriverInit_1_16
[AVHWDeviceContext @ 0x5590d517ee40] libva: va_openDriver() returns 0
[AVHWDeviceContext @ 0x5590d517ee40] Initialised VAAPI connection: version 1.17
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x41524742 -> bgra.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x42475241 -> argb.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x41424752 -> rgba.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x52474241 -> abgr.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x58524742 -> bgr0.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x42475258 -> 0rgb.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x58424752 -> rgb0.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x52474258 -> 0bgr.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30335241 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30334241 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30335258 -> x2rgb10le.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30334258 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x36314752 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50424752 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50524742 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x56555941 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30303859 -> gray.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x3231564e -> nv12.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x3132564e -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x32595559 -> yuyv422.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x59565955 -> uyvy422.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x32315659 -> yuv420p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30323449 -> yuv420p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50313134 -> yuv411p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x48323234 -> yuv422p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x56323234 -> yuv440p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x50343434 -> yuv444p.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x33434d49 -> unknown.
[AVHWDeviceContext @ 0x5590d517ee40] Format 0x30313050 -> p010le.
[AVHWDeviceContext @ 0x5590d517ee40] VAAPI driver: Intel iHD driver for Intel(R) Gen Graphics - 22.6.4 ().
[AVHWDeviceContext @ 0x5590d517ee40] Driver not found in known nonstandard list, using standard behaviour.
[AVHWDeviceContext @ 0x5590d517e940] Use Intel(R) oneVPL to create MFX session, API version is 2.6, the required implementation version is 1.3


  


  CPU starts being used intensively and then nothing happens.
Does anybody have any clue on it ?

  


  I have an Intel i7-8550U (8th gen Kaby Lake) processor with 4 cores (8 threads).

  


  I have also used these options to ffmpeg, getting the same results :

  


  ffmpeg -loglevel debug -init_hw_device qsv=hw -filter_hw_device hw -hwaccel qsv -hwaccel_output_format qsv -i test_video.mp4 -vf 'format=qsv,hwupload=extra_hw_frames=64' -c:v hevc_qsv -f mp4 output.mp4


  


  With VAAPI, transcoding runs flowlessly :

  


  ffmpeg -init_hw_device vaapi=intel:/dev/dri/renderD128 -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device intel -filter_hw_device intel -i test_video.mp4 -c:v hevc_vaapi -f mp4 output.mp4


  


• Stream mp4 file with watermark through a web using ffmpeg

  24 mars 2023, par Jose A. Matarán

  I'm having problems with ffmpeg, probably due to my inexperience with this software.

  


  My basic need is the following : I have a series of videos with material that I want to protect so that it is not plagiarized. For this I want to add a watermark so that when a user views it, they also see some personal data that prevents them from downloading and sharing it without permission.

  


  What I would like is to create a small Angular + Java application that does this task (invoking ffmpeg via Runtime#exec)

  


  I have seen that from ffmpeg I can emit to a server, like ffserver but I wonder if there is a somewhat simpler way. Something like launching the ffmpeg command from my java application with the necessary configuration and having ffmpeg emit the video along with the watermark through some port/protocol.

  


  EDIT

  


  I have continued to investigate and I have seen that ffmpeg allows you to broadcast for WebRTC, but you need an adapter. What I would like and I don't know if it is possible is to launch ffmpeg so that it acts as a server and it can be consumed from the web.