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• Recording video with unknown framerate with FFmpeg

  24 juillet 2017, par Chris

  I am recording video with FFmpeg and I would like the frame rate it is written with to at least be in the right ballpark. Right now I take the frame rate that my input claims to have and use that to set the frame rate (time_base) for my output video stream. However this is sometimes wildly different from the actual frame rate that I am getting (I have seen a stream claiming 50 fps but publishing at 9 fps).

  What I would like to do is use a elapsed timer and count the frames I record to calculate the actual frame rate I recorded at when I am finished recording. I would seem though that the frame rate is set in my AVStream is used in avcodec_open2 before I write any frames. If I set it later (such as while I am writing frames) while ffplay can play it (complaining that the time increment bits is 6 not 4) other video players cannot. Is there a way to set the frame rate for the whole file after writing the frames ? If not is there a way to tell the frames themselves some sort of timestamp or frame rate while I am recording that will result in a valid recorded file ?

• FFMPEG on cygwin failed to compile libx264 error : unknown type name ‘HMODULE’

  6 mai 2020, par Ivan Lee

  I am trying to compile libx264 in ffmpeg under cygwin environment.

  



  I have followed some directions from several sources from Koohiimaster's blog, FFMPEG compilation guide, SO post 1, SO post 2 but I always stuck at the same step which is the libx264 compilation (make) process.

  



  As mentioned in the FFMPEG compilation guide these steps should be followed in order to make libx264 works

  



  cd ~/ffmpeg_sources
wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
tar xjvf last_x264.tar.bz2
cd x264-snapshot*
PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" bindir="$HOME/bin" --enable-static --disable-opencl
PATH="$HOME/bin:$PATH" make
make install


  



  but when i enter this command PATH="$HOME/bin:$PATH" make the compiler always stop with the following errors :

  



  In file included from input/avs.c:49:0:
./extras/avisynth_c.h:825:3: error: unknown type name ‘HMODULE’
HMODULE handle;
^


  



  I was wondering whether this is libx264 source's bug, but after I tried several earlier source version, it produce the same error. Any thoughts to solve this problem ?

  


• FFMPEG on cygwin failed to compile libx264 error : unknown type name ‘HMODULE’

  6 mai 2020, par Ivan Lee

  I am trying to compile libx264 in ffmpeg under cygwin environment.

  



  I have followed some directions from several sources from Koohiimaster's blog, FFMPEG compilation guide, SO post 1, SO post 2 but I always stuck at the same step which is the libx264 compilation (make) process.

  



  As mentioned in the FFMPEG compilation guide these steps should be followed in order to make libx264 works

  



  cd ~/ffmpeg_sources
wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
tar xjvf last_x264.tar.bz2
cd x264-snapshot*
PATH="$HOME/bin:$PATH" ./configure --prefix="$HOME/ffmpeg_build" bindir="$HOME/bin" --enable-static --disable-opencl
PATH="$HOME/bin:$PATH" make
make install


  



  but when i enter this command PATH="$HOME/bin:$PATH" make the compiler always stop with the following errors :

  



  In file included from input/avs.c:49:0:
./extras/avisynth_c.h:825:3: error: unknown type name ‘HMODULE’
HMODULE handle;
^


  



  I was wondering whether this is libx264 source's bug, but after I tried several earlier source version, it produce the same error. Any thoughts to solve this problem ?