issue to fix the offset #53

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1. ashok-arjun commented on Dec 20, 2022

   

   ashok-arjun

   on Dec 20, 2022

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   @EhsanRusta What's the FPS of the original video? You should specify -itsoffset OFFSET/FPS where FPS is the original video's FPS I guess
2. devsvarun commented on Dec 22, 2022

   

   devsvarun

   on Dec 22, 2022

   Last edited by devsvarun

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   @EhsanRusta What's the FPS of the original video? You should specify -itsoffset OFFSET/FPS where FPS is the original video's FPS I guess

   still the offset of the corrected video is not close to 1

   👍React with 👍1Reacted by Dylan_Morgen
3. WudiJoey commented on Nov 3, 2023

   

   WudiJoey

   on Nov 3, 2023

   Last edited by WudiJoey

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   First, you should get the original FPS for each video. And then, synchronize video according to its AV OFFSET:

   1. when av offset is positive:
      ffmpeg -i input.mp4 -itsoffset abs(OFFSET)/FPS -i input.mp4 -map 0:v -map 1:a -c copy output.mp4

   2. when av offset is negative:
      ffmpeg -i input.mp4 -itsoffset abs(OFFSET)/FPS -i input.mp4 -map 1:v -map 0:a -c copy -t video_len-abs(OFFSET)/FPS output.mp4

   After doing this, OFFSET for the new video will be 0. But i only test on few videos.

   Referring to https://superuser.com/a/983153

   👍React with 👍5Reacted by huangxin168, prometheus-alien, Lin Qiu, Zhenyuan Zhang and ruoyxue

   ❤️React with ❤️2Reacted by huangxin168 and prometheus-alien
4. tailangjun commented on Dec 28, 2023

   

   tailangjun

   on Dec 28, 2023

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   2. -t video_len-abs(OFFSET)/FPS

   Why aren’t they all video_len-abs(OFFSET)/FPS?
5. WudiJoey commented on Dec 28, 2023

   

   WudiJoey

   on Dec 28, 2023 via email

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   您好，您的来信我已经收到，会尽快回复。  
6. tailangjun commented on Dec 28, 2023

   

   tailangjun

   on Dec 28, 2023

   Last edited by tailangjun

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   您好，您的来信我已经收到，会尽快回复。

   多谢兄弟，我是想问为啥一个时长不变，一个变成 video_len-abs(OFFSET)/FPS了
7. WudiJoey commented on Jan 3, 2024

   

   WudiJoey

   on Jan 3, 2024

   Last edited by WudiJoey

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   您好，您的来信我已经收到，会尽快回复。

   多谢兄弟，我是想问为啥一个时长不变，一个变成 video_len-abs(OFFSET)/FPS了

   嗷这里是考虑到音频提前之后视频会有一部分没有声音就裁掉了，我想了一下实际上应该同时对校正后视频的头尾进行裁剪，如果你的offset是几秒的话得到的视频前几秒是【卡顿有声音】或者【画面在动但是无声音】
   但是当你的offset就几帧的前提下没有太大影响，offset超过几秒的话有时候那个视频本身就对不上音频和唇形
8. prometheus-alien commented on Jan 31, 2024

   

   prometheus-alien

   on Jan 31, 2024

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   First, you should get the original FPS for each video. And then, synchronize video according to its AV OFFSET:

   1. when av offset is positive:
      ffmpeg -i input.mp4 -itsoffset abs(OFFSET)/FPS -i input.mp4 -map 0:v -map 1:a -c copy output.mp4
   2. when av offset is negative:
      ffmpeg -i input.mp4 -itsoffset abs(OFFSET)/FPS -i input.mp4 -map 1:v -map 0:a -c copy -t video_len-abs(OFFSET)/FPS output.mp4

   After doing this, OFFSET for the new video will be 0. But i only test on few videos.

   Referring to https://superuser.com/a/983153

   谢谢，好人一生平安
9. prometheus-alien commented on Feb 1, 2024

   

   prometheus-alien

   on Feb 1, 2024

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   您好，您的来信我已经收到，会尽快回复。

   多谢兄弟，我是想问为啥一个时长不变，一个变成 video_len-abs(OFFSET)/FPS了

   嗷这里是考虑到音频提前之后视频会有一部分没有声音就裁掉了，我想了一下实际上应该同时对校正后视频的头尾进行裁剪，如果你的offset是几秒的话得到的视频前几秒是【卡顿有声音】或者【画面在动但是无声音】 但是当你的offset就几帧的前提下没有太大影响，offset超过几秒的话有时候那个视频本身就对不上音频和唇形

   谢谢子华兄