How to preserve transparent mask layers in exported videos

[Good0007]

Expected Behavior

My original video was in mov format with Alpha channels, but the transparent channels were lost after exporting. I can use ffmpeg to export, It is normal :

ffmpeg -i test.mov -vf "scale=640:-1:flags=lanczos" -c:v qtrle out_test.mov

Actual Behavior

Steps to Reproduce the Problem

# 加载带透明通道的视频
alpha_video_clip = VideoFileClip("/Users/kangkang/Downloads/videos/test.mov",has_mask=True)
alpha_video_clip = alpha_video_clip.resize((720,1080))
# 导出视频丢失了透明度
alpha_video_clip.write_videofile("out_test.mov", codec='qtrle', threads=8,audio_codec='aac')
# ffmpeg命令导出正常
# ffmpeg -i test.mov -vf "scale=640:-1:flags=lanczos" -c:v qtrle out_test.mov

Specifications

• Python Version: 3.10
• MoviePy Version: 1.0.3
• Platform Name: macos
• Platform Version: 15

[SohamTilekar]

Do You know how to get the transparent video.

[Good0007]

Do You know how to get the transparent video.

According to my test, Moviepy does not support loading and exporting a transparent video as another transparent video. You can use ffmpeg to complete this task

[SohamTilekar]

Could You Give the Example Commands for the FFMPEG.

[Good0007]

Could You Give the Example Commands for the FFMPEG.

• Pngs to transparent video (png files : image000001.png .... image000xxx.png)

ffmpeg -i ./pngs/image%06d.png -i ./audio/f3ab7be97c98a6abca9723a8c17cf769.wav -c:v qtrle -r 24 -crf 22 -map 0:v -map 1:a out.mov -y

• Resize transparent video

ffmpeg -i test.mov -vf "scale=640:-1:flags=lanczos" -c:v qtrle oput2.mov

[Royallseal]

I have tried a method from another guy and solved this problem, link here "https://github.com/Zulko/moviepy/issues/1555", according to his code, I just add a tag as "has_mask=True" in my code when using the func 'VideoFileClip()', then it works, that's amazing, but it's not bad.