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• What version of ffmpeg is bundled inside electron ?

  7 août 2020, par greghmerrill

  The prebuilt electron binaries for Windows include the file ffmpeg.dll. How can I determine what version of the underlying ffmpeg library is actually compiled to produce this dll ? I need this information to understand what known vulnerabilities (CVE's, etc) might be in a given version of electron via ffmpeg.

  



  As I understand it, the ffmpeg dll itself is taken from https://github.com/electron/nightlies/releases/ when I download my dependencies (I'm using electron-prebuilt-compile). But I'm not getting a clear picture of what the source for that binary is. I think it might be from https://chromium.googlesource.com/chromium/third_party/ffmpeg/ but then I'm not clear on the relationship of that repo with the original ffmpeg repo (e.g. how often are fixes merged from the ffmpeg repo to the chromium third-party repo, etc.)

  



  I tried searching the content of the dll as per cody's suggestion, but no luck :

  



  $ strings ffmpeg.dll  | grep -i ffmp
FFmpeg video codec #1
Huffyuv FFmpeg variant
Not yet implemented in FFmpeg, patches welcome
C:\projects\libchromiumcontent\src\out-x64\static_library\ffmpeg.dll.pdb
ffmpeg.dll


$ strings ffmpeg.dll  | grep -i version
H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2
MPEG-4 part 2 Microsoft variant version 1
MPEG-4 part 2 Microsoft variant version 2
MPEG-4 part 2 Microsoft variant version 3
H.263+ / H.263-1998 / H.263 version 2
On2 VP6 (Flash version)
On2 VP6 (Flash version, with alpha channel)
old standard qpel (autodetected per FOURCC/version)
direct-qpel-blocksize bug (autodetected per FOURCC/version)
edge padding bug (autodetected per FOURCC/version)
strictly conform to a older more strict version of the spec or reference software
minor_version
premiere_version
quicktime_version
Assume this x264 version if no x264 version found in any SEI


  


• Build h323plus support h264 and h263

  8 février 2019, par Ильдар Нурмухаметов

  Try build H323Plus(latest version) with support H263 and H264 codes.

  From config.log found error :

  /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/bin/ld: /tmp/ccLlS6ND.o: in function `main':
  
  conftest.c:(.text.startup+0x7): undefined reference to `h263p_encoder'
  
  collect2: error: ld returned 1 exit status

  It seems h263p_encoder not found from avcodec.

  FFmpeg(latest 4 version ) build with params :

  --enable-libx264 --enable-libxvid --enable-libx265 --enable-gpl --disable-x86asm --enable-shared --prefix=/usr --libdir=/usr/lib64

  This codecs I see from FFmpeg. If execute command ffmpeg —codecs :

  DEV.L. h263                 H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2 (decoders: h263 h263_v4l2m2m ) (encoders: h263 h263_v4l2m2m )
  
  D.V.L. h263i                Intel H.263
  
  DEV.L. h263p                H.263+ / H.263-1998 / H.263 version 2
  
  DEV.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_v4l2m2m h264_cuvid ) (encoders: libx264 libx264rgb h264_nvenc h264_v4l2m2m nvenc nvenc_h264 )

  Can any help please. I try build project from Ubuntu 18.04 and Opensuse 15.0

• FFMPEG : Combine "Create video from images" + scale to x + add audio + overlay logo

  7 janvier 2020, par Thomas Wild

  I´m working on a webcam-project. It is for generating timelapse videos of sunset/sundown.

  I´m using a raspberrypi to generate them with gphoto2 + DSLR.

  At the end of the day the images should get to an video, with audio and an overlay logo.
  And it should be scaled to 1920 pixel.
  I got a nice solution an it worked.

  1. Producing the timelapse video an scale it :

     ffmpeg -y -framerate 25 -start_number 0000001 -i /var/www/html/webcam/2020-01-05_bilder/%7d.jpg -vf scale=1920:-1 -pix_fmt yuv420p /var/www/html/webcam/2020-01-05-tag-output-1920.mp4

  2. Taking the output of (1) and add an overlay-logo, add audio

     ffmpeg -y -i '/var/www/html/webcam/2020-01-05-tag-output-1920.mp4'
-i '/var/www/html/webcam-scripts/graphics/logo.png'
-i '/var/www/html/webcam-scripts/sounds/chill_time_5.mp3'
-shortest -filter_complex '[1][0]scale2ref=h=ow/mdar:w=iw/6[#A logo][liebfrauen]; [#A logo]format=argb,colorchannelmixer=aa=0.95[#B logo transparent]; [liebfrauen][#B logo transparent] overlay=(main_w-w)-(main_w*0.05):(main_h-h)-(main_h*0.01)'
-c:v libx264 -crf 18 -preset slow -pix_fmt yuv420p -c:a aac -strict -2
'/var/www/html/webcam/2020-01-05-tag-1920.mp4

  I tried to combine both actions, but I get an error :

  ffmpeg -y -framerate 25 -start_number 0000001 -i '/var/www/html/webcam/2020-01-05_bilder/%7d.jpg' -vf scale=1920:-1 -pix_fmt yuv420p -i '/var/www/html/webcam-scripts/graphics/logo.png' -i '/var/www/html/webcam-scripts/sounds/chill_time_5.mp3' -shortest -filter_complex '[1][0]scale2ref=h=ow/mdar:w=iw/6[#A logo][liebfrauen]; [#A logo]format=argb,colorchannelmixer=aa=0.95[#B logo transparent]; [liebfrauen][#B logo transparent] overlay=(main_w-w)-(main_w*0.05):(main_h-h)-(main_h*0.01)' -c:v libx264 -crf 18 -preset slow -pix_fmt yuv420p -c:a aac -strict -2 '/var/www/html/webcam/2020-01-05-tag-1920.mp4'

  Error : Filtergraph ’scale=720 :-1’ was specified through the -vf/-af/-filter option for output stream 0:0, which is fed from a complex filtergraph.
   vf/-af/-filter and -filter_complex cannot be used together for the same stream.

  Isn`t it possible to combine these inputs and scale it ? Or ... Where is my misunderstanding ?