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• 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 !

  


• Is it safe to ignore the error "Invalid UTF-8 in decoded subtitles text ; maybe missing -sub_charenc option Error while decoding stream" ?

  30 avril 2022, par Clogged-artery

  I was encoding a video with subtitles and I got the error, "Invalid UTF-8 in decoded subtitles text ; maybe missing -sub_charenc option. Error while decoding stream" but the video encoded anyway. What are the consequences of ignoring this error ? A google search showed a result of one guy saying it skips that sub so the resulting video will have missing subs. Can someone confirm this ?

  


  I know how to fix it but I have already converted 50+ videos with subtitles and I'm fairly certain that a few of them had this error. I just want someone to tell me that it's okay to ignore so I don't have to watch 200 hours of videos.

  


  Solution for fixing subtitle errors :

  


  Create a batch file and edit with the following :

  


  for %%a in ("*.srt") do ffmpeg -v 9 -loglevel 99 -sub_charenc CP1252 -i "%%a" "newfiles\%%~na.srt"
pause


  


• How can I automate the subtitle adding process in FFMPEG ?

  23 septembre 2022, par Phoeniqz

  The situation is, that I have 10 MP4 videos and a folder for each of them that has the same name as its video. In each of folders there are around 30 SRT files I need to add. I would like to automate this. I mean a script that would add each SRT file to the video and add the correct handler for the subtitles, so that the subtitle would appear as "English" instead of "Subtitle #12" in a movie player. I made a python script ; it's far from perfect and it does not add the handlers correctly.

  


  The name of each SRT file is something like "20_Hebrew.srt"

  


  

import os
file_dir = r"Path/to/my/files"
sub_dir = file_dir + "/Subs"


def add_sub(file, file_name):
    cmd = f"ffmpeg -i '{file}' "
    sub_list = []

    no_extension = file_name.replace(".mp4", "")

    for sub_name in os.listdir(sub_dir + f"/{no_extension}"):
        s = os.path.join(sub_dir + f"/{no_extension}", sub_name)

        if os.path.isfile(s):
            cmd += f"-i '{s}' "
            sub_list.append(s)
    
    cmd += "-map 0:v -map 0:a "

    for i, v in enumerate(sub_list):
        cmd += f"-map {i+1} "
    
    cmd += "-c:v copy -c:a copy "

    for i, v in enumerate(sub_list):
        sub_lang = v.replace(".srt", "")
        index = sub_lang.index(f"/Subs/")
        sub_lang = sub_lang[index:]
        index = sub_lang.index("_")
        sub_lang = sub_lang[index+1:]

        cmd += f"-c:s:{i} mov_text -metadata:s:s:{i} language='{sub_lang}' -metadata:s:s:{i} handler='{sub_lang}' "

    cmd += f"'{file}_OUTP.mp4'"

    os.system(cmd)

for file_name in os.listdir(file_dir):
    f = os.path.join(file_dir, file_name)

    if os.path.isfile(f):
        add_sub(f, file_name)