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• Show progress bar of a ffmpeg video convertion

  13 juin 2022, par stackexchange.com-upvm25mz

  I'm trying to print a progress bar while executing ffmpeg but I'm having trouble getting the total number of frames and the current frame being processed. The error I get is AttributeError: 'NoneType' object has no attribute 'groups'. I've copied the function from this program and for some reason it works there but not here, even though I haven't changed that part.

  


  main.py

  


  pattern_duration = re.compile(
    'duration[ \t\r]?:[ \t\r]?(.+?),[ \t\r]?start', re.IGNORECASE)
pattern_progress = re.compile('time=(.+?)[ \t\r]?bitrate', re.IGNORECASE)

def execute_ffmpeg(self, manager, cmd):
    proc = expect.spawn(cmd, encoding='utf-8')
    self.update_progress_bar(proc, manager)
    self.raise_ffmpeg_error(proc)

def update_progress_bar(self, proc, manager):
    total = self.get_total_frames(proc)
    cont = 0
    pbar = self.initialize_progress_bar(manager)
    try:
        proc.expect(pattern_duration)
        while True:
            progress = self.get_current_frame(proc)
            percent = progress / total * 100
            pbar.update(percent - cont)
            cont = percent
    except expect.EOF:
        pass
    finally:
        if pbar is not None:
            pbar.close()

def raise_ffmpeg_error(self, proc):
    proc.expect(expect.EOF)
    res = proc.before
    res += proc.read()
    exitstatus = proc.wait()
    if exitstatus:
        raise ffmpeg.Error('ffmpeg', '', res)

def initialize_progress_bar(self, manager):
    pbar = None
    pbar = manager.counter(
        total=100,
        desc=self.path.rsplit(os.path.sep, 1)[-1],
        unit='%',
        bar_format=BAR_FMT,
        counter_format=COUNTER_FMT,
        leave=False
    )
    return pbar

def get_total_frames(self, proc):
    return sum(map(lambda x: float(
        x[1])*60**x[0], enumerate(reversed(proc.match.groups()[0].strip().split(':')))))

def get_current_frame(self, proc):
    proc.expect(pattern_progress)
    return sum(map(lambda x: float(
                x[1])*60**x[0], enumerate(reversed(proc.match.groups()[0].strip().split(':')))))


  


• How can I change slice_type which is show in Elecard stream analyzer using ffmpeg ?

  10 octobre 2018, par Tooraj Jam

  I’m not ffmpeg and encodding expert and am trying to encode a MP4 file to MPEG-4 h264 .ts file.

  When Elecard stream analyzer is analyzing my result .ts file, it shows slice_type = 7 for all of i-frames as you can see in the attached screenshot.

  How can I change all these to slice_type = 2 ?

  My ffmpeg command :

  -i Source.mp4 \
  
  -filter:v 'setpts=0+PTQ-STARTPTS' -metadata:s:v:0 start_time=0 \
  
  -f adts -c:a libfdk_aac  -profile:a aac_he  -strict -2 -ar 48000 -b:a 48k \
  
  -f mpegts -c:v libx264  -vbsf h264_mp4toannexb -strict experimental -    profile:v main -level:v 3.0 -preset:v slow -movflags faststart -pat_period 100 \
  
  -x264opts nal-hrd=cbr:force-cfr=1 -crf 25 -vf scale=w=640:h=360 -aspect 16:9 \
  
  -bf 1  -sc_threshold 0 -keyint_min 2*25 -g 2*25 \
  
  -force_key_frames "expr:gte(t,n_forced*50)" -max_muxing_queue_size 1500k \
  
  -coder 1  -refs 2 \
  
  -b:v 750k -minrate 750k -maxrate 750k -bufsize 1500k \
  
  -vsync 1 -framerate 25000/1001 \
  
  -x264opts "bitrate=750:vbv-maxrate=750:vbv-bufsize=1500"\
  
  -pix_fmt yuv420p  -r 25 -x264opts force-cfr \
  
  -mbs_per_slice 1 -y dest.ts

  

• Mingw-w64 builded FFmpeg doesn't show any usage information

  26 octobre 2013, par user1240328

  First I wanted to modificate ffplay according to my requirments. Then I noticed that original ffplay from my build can't play some video files, but it didn't write any message to console. Then I noticed that ffmpeg also don't write any usage message when I run it without params. But it works. If I run it from terminal it's like running asynchronously ! The terminal just shows next row. I mean it asks for a next command. But the ffmpeg process is visible in task manager and it writes the output video file what I had requested !

  I created following souce file. I have modified the Makefile. So it have built the exe-file works just the same way. I have no idea how it can be.

  #include 
  
  #include "cmdutils.h"
  
  
  
  const char program_name[] = "hello";
  
  const int program_birth_year = 2013;
  
  
  
  void show_help_default(const char *opt, const char *arg)
  
  {
  
      printf("zxcvbnm\n");
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
      printf("1234567890\n");
  
      return 0;
  
  }

  I want to prevent this behavior.

  I want to make printf working in traditional manner.

  How I build FFmpeg :

  PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
  
  SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
  
  ./configure \
  
    --prefix=/home/developer/workspace/MinGW32fs \
  
    --extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib" \
  
    --extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
  
    --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32-  \
  
    --pkg-config=pkg-config   --enable-libtheora --enable-libvorbis --enable-libvpx \
  
    --enable-outdev=sdl --enable-shared --disable-static \
  
    --disable-doc --disable-manpages --disable-podpages
  
  
  
  make