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• Why ffmpeg can play h264 even when flag —disable-libx264 is set ? [closed]

  2 décembre 2020, par Jams

  To be complient with x264 licensing (for a commercial software I'm making) I plan to use a compiled version of ffmpeg without x264 support.
Here is the ouput of the command line ffmpeg -L :

  


  


  ffmpeg version n4.3.1-20-g8a2acdc6da Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3-win32 (GCC) 20200320
configuration : —prefix=/ffbuild/prefix —pkg-config-flags=—static —pkg-config=pkg-config —cross-prefix=x86_64-w64-mingw32- —arch=x86_64 —target-os=mingw32 —enable-version3 —disable-debug —enable-shared —disable-static —disable-debug —enable-iconv —enable-zlib —enable-libxml2 —enable-libfreetype —enable-libfribidi —enable-gmp —enable-lzma —enable-fontconfig —enable-opencl —enable-libvmaf —disable-vulkan —enable-libvorbis —enable-amf —enable-libaom —disable-avisynth —enable-libdav1d —disable-libdavs2 —enable-ffnvcodec —enable-cuda-llvm —disable-libglslang —enable-libass —enable-libbluray —enable-libmp3lame —enable-libopus —enable-libtheora —enable-libvpx —enable-libwebp —enable-libmfx —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-librav1e —enable-schannel —enable-sdl2 —enable-libsoxr —enable-libsrt —enable-libtwolame —disable-libvidstab —disable-libx264 —disable-libx265 —disable-libxavs2 —disable-libxvid —enable-libzimg —extra-cflags=-DLIBTWOLAME_STATIC —extra-cxxflags= —extra-ldflags=-pthread —extra-libs=-lgomp
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
ffmpeg is free software ; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation ; either version 3 of the License, or
(at your option) any later version.

  


  


  But when I play a video encoded with h264 it plays perfectly.
Is expected ? How to be sure I'm not infringing the license ?

  


  Here is where I downloaded the binaries :
https://github.com/BtbN/FFmpeg-Builds/releases
  
And I picked a release with the following name : win64-gpl-shared-4.3.zip

  


  Thanks.

  


• How can I send a virtual camera to Genymotion or Android Studio Emulator in Ubuntu ?

  4 décembre 2020, par ykasur

  I created a virtual camera using v4l2loopback and ffmpeg. The command I use for ffmpeg is :
ffmpeg -re -l oop 1 -i vin.png -vf format=yuv420p -f v4l2 /dev/video2

  


  vin.png is the image I want to stream to the webcam and /dev/video2 is the virtual webcam I created with v4l2loopback.
The virtual webcam works and I can see it e.g. with onlinemicetest.com/webcam-test.
I'm using the Genymotion emulator with the newest Android API (I tried 7.0, 8.1 and 10.0) on Ubuntu 20.40.
Genymotion detects the virtual camera but only displays a dummy image :
Wrong dummy Image from Genymotion
I also tried (and would prefer to use) the android studio emulator. But I can only select Webcam0 in the configuration of the device camera and that points to the real integrated camera and not to my virtual webcam.

  


  I don't need to use ffmpeg, but I do need to use a tool that lets me control which image to stream from the command line.

  


  Is there a way to solve this ? Many thanks in advance !

  


  Update 17.11.2020 :
The Genymotion support answered me, that they plan to support virtual cameras in the future. They might be ready to add this in mid 2021.

  


• ffmpeg filter complex error ( burning subtitles used overlay filter)

  8 septembre 2020, par jgkim0518

  I try to burn dvb subtitles, based image, on video used ffmpeg overlay filter. but I failed because wrong using filter complex.

  


  It's my command line.

  


  ./ffmpeg -y -hwaccel cuda -hwaccel_output_format cuda -hwaccel_device 0 \
-i input.ts \
-filter_complex "[v:0][s:3]overlay[overlay];[overlay]hwupload_cuda[base];[base]scale_npp=1920:1080[v1];[base]scale_npp=1920:1080[v2];[base]scale_npp=1280:720[v3];[base]scale_npp=720:480[v4];[base]scale_npp=480:360[v5]" \
-map "[v1]" -map 0:a -c:v hevc_nvenc -b:v 6000000 -maxrate 7000000 -bufsize 12000000 -g 15 -c:a libfdk_aac -ar 48000 -ac 2 -pkt_size 128000 -f mpegts test_1.ts \
-map "[v2]" -map 0:a -c:v h264_nvenc -an -b:v 4000000 -maxrate 5000000 -bufsize 8000000 -g 15 -f mpegts test_2.ts \
-map "[v3]" -map 0:a -c:v h264_nvenc -an -b:v 2500000 -maxrate 3500000 -bufsize 5000000 -g 15 -f mpegts test_3.ts \
-map "[v4]" -map 0:a -c:v h264_nvenc -an -b:v 1500000 -maxrate 2500000 -bufsize 3000000 -g 15 -f mpegts test_4.ts \
-map "[v5]" -map 0:a -c:v h264_nvenc -an -b:v 800000 -maxrate 1800000 -bufsize 2000000 -g 15 -f mpegts test_5.ts


  


  but I failed. It is error messages.

  


  Input #0, mpegts, from 'input.ts':
Duration: N/A, start: 22881.964411, bitrate: N/A
  Program 1 
    Metadata:
      service_name    : Service01
      service_provider: FFmpeg
    Stream #0:0[0x100](eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:1[0x101](ind): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:2[0x102](zho): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:3[0x103](kho): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:4[0x104]: Video: h264 (High), 1 reference frame ([27][0][0][0] / 0x001B), yuv420p(top first, left), 1920x1080 (1920x1088) [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    Stream #0:5[0x105](CHI): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:6[0x106](CHS): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:7[0x107](IND): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:8[0x108](THA): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:9[0x109](MAN): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:10[0x10a](MON): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:11[0x10b](BUR): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:12[0x10c](ENG): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    [mpegts @ 0x47cbd00] Invalid stream specifier: base.
    Last message repeated 17 times
    Stream specifier 'base' in filtergraph description [v:0][s:3]overlay[overlay];[overlay]hwupload_cuda[base];[base]scale_npp=1920:1080[v1];[base]scale_npp=1920:1080[v2];[base]scale_npp=1280:720[v3];[base]scale_npp=720:480[v4];[base]scale_npp=480:360[v5] matches no streams.


  


  My plan is this.


  


  How to do burn subtitle on video using filter complex, ffmpeg from this structure ?