背景和問題

Question 1

預設情況下，FFmpeg 不會傳輸大多數用戶元數據，但它會傳輸旋轉標籤等欄位。

下面的命令指示 FFmpeg 傳輸所有元數據，但隨後覆蓋旋轉標籤值。

ffmpeg -i in.mp4 -c copy -map_metadata 0 -metadata:s:v:0 rotate=0 -an out.mp4

Answer

預設情況下，FFmpeg 不會傳輸大多數用戶元數據，但它會傳輸旋轉標籤等欄位。

下面的命令指示 FFmpeg 傳輸所有元數據，但隨後覆蓋旋轉標籤值。

ffmpeg -i in.mp4 -c copy -map_metadata 0 -metadata:s:v:0 rotate=0 -an out.mp4

Question 2

運行這個命令：

ffmpeg -i oldfile.mp4 -codec copy -metadata title="" -metadata album="" -metadata year="" -metadata container="" -metadata artist="" -metadata comment="" newfile.mp4

透過在每個元資料類型中使用“”，它將清空舊的元數據，然後 ffmpeg 將整個檔案複製到清除元資料的新檔案。

建立新文件後，您需要刪除舊文件以避免重複。

Answer

運行這個命令：

ffmpeg -i oldfile.mp4 -codec copy -metadata title="" -metadata album="" -metadata year="" -metadata container="" -metadata artist="" -metadata comment="" newfile.mp4

透過在每個元資料類型中使用“”，它將清空舊的元數據，然後 ffmpeg 將整個檔案複製到清除元資料的新檔案。

建立新文件後，您需要刪除舊文件以避免重複。

Question 3

安裝誘變Python庫：
```
python3.6 -m pip install --user mutagen
```
或者：
```
python2.7 -m pip install --user mutagen
```
Mutagen 是一個用於處理音訊元資料的 Python 模組。
將以下內容另存為，metadata_cleaner.py但您可以將其命名為任何名稱。
更改VIDEO_FOLDER = 'your_full_path_for_your_videos_folder'變數。
修改「您的變更」行之間要覆寫的屬性。
到處跑python metadata_cleaner.py。

這是腳本：

import os
from mutagen.mp4 import MP4
## Can import MP3 as well if you want to modify MP3 files

## Folder full path to the files you want to modify:

FILES_FOLDER = "/media/removable/64GB-Micro/FilesToClean"

def get_all_files(path):
    """Returns all the files in the path as a list
    """
    return os.listdir(path)

def clean_metadata(videos_dir, files):
    """
    Receives two variables videos_dir (full file folder path) and files (list)
    Iterates over all the files in the directory and creates full paths for 
    every file using the videos_dir path and os.path.join function.
    """
    for file_name in files:
        file_path = os.path.join(videos_dir, file_name)

        ## create MP4 video_file instance

        video_file = MP4(file_path)

        ## This line will print out all key-value for the video_file-s:
        ## Useful if you don't know which attributes you want to modify yet

        print(video_file)

        ## In this example I wanted to clean the ART, aArt = Artist metadata
        ## and nam = Song Name metadata
        ## These prints will show artists and titles for each file before clean
        ## -------------------------- Your changes ---------------------------
        print("file_name: {}".format(file_name))
        print("Old ART: {}".format(video_file.get('\xa9ART', "Key not found")))
        print("Old aArt: {}".format(video_file.get('aART', "Key not found")))
        print("Old nam: {}".format(video_file.get('\xa9nam', "Key not found")))

        ## clean artist and name
        ## This part will overwrite the artist and song name attributes

        video_file['\xa9ART'] = ''
        video_file['aART'] = ''
        video_file['\xa9nam'] = ''
        ## -------------------------- Your changes ---------------------------
        ## save new metadata

        video_file.save()

        ## show video_file artist and title after clean
        ## Just to see if our actions were successful print out song metadata
        ## again after the changes

        print("New ART: {}".format(video_file.get('\xa9ART', "Key not found")))
        print("New aArt: {}".format(video_file.get('aART', "Key not found")))
        print("New nam: {}".format(video_file.get('\xa9nam', "Key not found")))


if __name__ == '__main__':
    ## load all the files into files variable as a list

    files = get_all_files(FILES_FOLDER)

    ## run clean_metadata function to clean all the files in the VIDEO_FOLDER
    ## path
    clean_metadata(videos_dir=FILES_FOLDER, files=files)

Answer

安裝誘變Python庫：
```
python3.6 -m pip install --user mutagen
```
或者：
```
python2.7 -m pip install --user mutagen
```
Mutagen 是一個用於處理音訊元資料的 Python 模組。
將以下內容另存為，metadata_cleaner.py但您可以將其命名為任何名稱。
更改VIDEO_FOLDER = 'your_full_path_for_your_videos_folder'變數。
修改「您的變更」行之間要覆寫的屬性。
到處跑python metadata_cleaner.py。

這是腳本：

import os
from mutagen.mp4 import MP4
## Can import MP3 as well if you want to modify MP3 files

## Folder full path to the files you want to modify:

FILES_FOLDER = "/media/removable/64GB-Micro/FilesToClean"

def get_all_files(path):
    """Returns all the files in the path as a list
    """
    return os.listdir(path)

def clean_metadata(videos_dir, files):
    """
    Receives two variables videos_dir (full file folder path) and files (list)
    Iterates over all the files in the directory and creates full paths for 
    every file using the videos_dir path and os.path.join function.
    """
    for file_name in files:
        file_path = os.path.join(videos_dir, file_name)

        ## create MP4 video_file instance

        video_file = MP4(file_path)

        ## This line will print out all key-value for the video_file-s:
        ## Useful if you don't know which attributes you want to modify yet

        print(video_file)

        ## In this example I wanted to clean the ART, aArt = Artist metadata
        ## and nam = Song Name metadata
        ## These prints will show artists and titles for each file before clean
        ## -------------------------- Your changes ---------------------------
        print("file_name: {}".format(file_name))
        print("Old ART: {}".format(video_file.get('\xa9ART', "Key not found")))
        print("Old aArt: {}".format(video_file.get('aART', "Key not found")))
        print("Old nam: {}".format(video_file.get('\xa9nam', "Key not found")))

        ## clean artist and name
        ## This part will overwrite the artist and song name attributes

        video_file['\xa9ART'] = ''
        video_file['aART'] = ''
        video_file['\xa9nam'] = ''
        ## -------------------------- Your changes ---------------------------
        ## save new metadata

        video_file.save()

        ## show video_file artist and title after clean
        ## Just to see if our actions were successful print out song metadata
        ## again after the changes

        print("New ART: {}".format(video_file.get('\xa9ART', "Key not found")))
        print("New aArt: {}".format(video_file.get('aART', "Key not found")))
        print("New nam: {}".format(video_file.get('\xa9nam', "Key not found")))


if __name__ == '__main__':
    ## load all the files into files variable as a list

    files = get_all_files(FILES_FOLDER)

    ## run clean_metadata function to clean all the files in the VIDEO_FOLDER
    ## path
    clean_metadata(videos_dir=FILES_FOLDER, files=files)

背景和問題

背景和問題

額外的信息

重新混合先前的元數據

重新復用過程

重新混合後的元數據

答案1

答案2

答案3

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