Recherche avancée

Sur d’autres sites (7112)

• ffplay - How to display “pts_time=…” while playing the video ?

  14 novembre 2023, par Deni

  I am a beginner in ffmpeg and need to know how to use ffplay in Linux to display the pts_time while the video is playing.

  


  I'm interested in seeing the pts_time of each frame. So I can check if the adblock begins with an IDR frame.

  


  In windows machine I use the following commands to identify if the adbock begins with an IDR frames (by using pts-time infos) :

  


   ffplay -vf "drawtext=fontfile=/Tools/ffmpeg/arial.ttf:text='%{pts}%{pict_type}':fontsize=(h/10):box=1:x=(w-tw)/2:y=h-(2*lh)" c:/video.ts
 
    ffprobe -show_frames -show_entries frame=pts_time,pict_type,key_frame -select_streams v c:/video.ts | grep -E --after-context=5 --before-context=5 "49635.045689"


  


  I need the PTS time to be displayed as in the attached photo :

  


  

  


  In Linux I am able to play the video with the command ffplay video.ts and with the help of VcXsrv Windows X Server to be able to access the graphical interface of the Linux server from my Windows PC.

  


  and with the following ffprobe comand, I am able to see the frames details and the pts_time of each frame :

  


  ffprobe -select_streams v -show_frames video.ts
*[FRAME]
media_type=video
stream_index=5
**key_frame=1** */* it is a IDR frame*
pkt_pts=4467154112
**pkt_pts_time=49635.045689** 
pkt_dts=4467155912
pkt_dts_time=49635.065689
best_effort_timestamp=4467154112
best_effort_timestamp_time=49635.045689
pkt_duration=1800
pkt_duration_time=0.020000
pkt_pos=2262204
pkt_size=46939
width=1280
height=1080
pix_fmt=yuv420p
sample_aspect_ratio=3:2
pict_type=I
coded_picture_number=21
display_picture_number=0
interlaced_frame=1
top_field_first=1
repeat_pict=0
color_range=tv
color_space=bt709
color_primaries=bt709
color_transfer=bt709
chroma_location=left
[SIDE_DATA]


  


  Any help would mean a lot to me !

  


• FFmpeg crop portrait video 1:1 from the top based on dynamic value

  8 avril 2022, par hugger

  I am replacing my video editing component with FFmpeg. So far it has been smooth until getting to this point where I need to crop my vertical (portrait) video to 1080x1080 with a dynamic value.

  


  Essentially, I built a custom component to do the cropping, where I can pan a square box over the video. the Y value for the pan is where I wish to cut the top part of the video.

  


  Here is the code I have tried, which works but is not cropping to my desired specs note : offsetDiff is the space I wish to remove from the top (pan px value) :

  


    cropSelected() {
    const diff =
      this.props.videoHeight / (this.state.aspectRatio * deviceWidth);
    const offsetDiff = this.state.offsetTopTranslate * diff;

    var path =
      this.props.type === 'photo'
        ? RNFS.DocumentDirectoryPath + '/after.png'
        : RNFS.DocumentDirectoryPath + '/after.mp4';

    var filterPath =
      this.props.type === 'photo'
        ? RNFS.DocumentDirectoryPath + '/afterFilter.png'
        : RNFS.DocumentDirectoryPath + '/afterFilter.mp4';

    FFmpegKit.execute(
      `-y -i ${path} -vf "crop=iw:1080:0:${offsetDiff}, scale=1080:1080" -qscale 0 ${filterPath}`,
    ).then(async session => {
      const returnCode = await session.getReturnCode();
      if (ReturnCode.isSuccess(returnCode)) {
        // SUCCESS
        this.setState({
          mediaSource:
            this.props.type === 'video'
              ? `file://${filterPath}?${new Date().getTime()}`
              : filterPath,
          isOpen: !this.state.isOpen,
          ffMPEGinProgress: null,
          aspectRatio: 1080 / 1080,
        });
      } else if (ReturnCode.isCancel(returnCode)) {
        // CANCEL
      } else {
        // ERROR
        alert('error');
      }
    });
  }


  


  Basically here I am trying to tell FFmpeg to keep the width (1080), make the height 1080, ignore X value, crop dynamic amount from the top.

  


  Here is what my cropper component looks like to get an idea.

  


  

  


  I appreciate any help I can get here folks, cheers !

  


• can ffmpeg videos command be used for images ? [closed]

  14 janvier, par Mary

  I came across this question but I see it is for videos only .
Does anyone knows if this command, from the above post, ffmpeg -r VIDEOFPS -i VIDEO -r VIDEOFPS -i VIDEO -lavfi blend=all_mode=grainextract -c:v libx264 -crf 0 -an ./out.mp4 can be used for images ?, to extract the difference between 2 images in an output image ?