[FFmpeg-user] cut at keyframes

[Pawel Por]

>>* ffmpeg -noaccurate_seek -i input.mp4 -ss 1 -t 3
*>>* -acodec copy -vcodec copy -y out.mp4
*>> >>* I've upgraded to the newer version of ffmpeg 2.2 and I
*>>* found that now when I use the above command it cuts my
*>>* movies not at closest keyframes.
*
>I tested the following with the sample you uploaded
>with FFmpeg 1.0 and current git head:
>$ ffmpeg -ss 1 -i test.mp4 -acodec copy -vcodec copy -t 3 out.mp4
>Both versions produce the same output frames, what do I
>miss?
>Please don't top-post here, it is considered rude.
>Carl Eugen

Thanks for reply.
My goal is to cut my mp4 movie exactly at keyframe.
Is it possible with the most recent version of ffmpeg ?
I've used -noaccurate_seek option but it didn't help.

Please tell me how I can do that.

When it turns out that it is not possible with the most recent version
of ffmpeg I will downgrade to version 1.0.7 and provide you with a
feedback.

Do I top-post ? It looks like I'm not aware of it. I'm sorry.



On Wed, Apr 2, 2014 at 9:16 AM, Pawel Por <porparek at gmail.com> wrote:

> Thaks for reply. I've uploaded test.mp4 (10MB) file into the following
> location:
> http://www.sendspace.pl/en/file/3e79185144b8a84429197cd
>
>
> On Tue, Apr 1, 2014 at 11:28 AM, Pawel Por <porparek at gmail.com> wrote:
>
>> Hi
>> I'm a great fan of ffmpeg. I've been using the version 1.0.7 of ffmpeg
>> and it was cutting my mp4 movies at closest keyframes.
>> It was exactly what I wanted.
>> It was very useful to me. I was using the following command:
>> ffmpeg -noaccurate_seek -i input.mp4 -ss 1 -t 3 -acodec copy -vcodec copy
>> -y out.mp4
>>
>> I've upgraded to the newer version of ffmpeg 2.2 and I found that now
>> when I use the above command it cuts my movies not at closest keyframes.
>> I tried "-noaccurate_seek" option (as follows) but it still cuts my
>> movies not at a closest keyframes.
>> ffmpeg -noaccurate_seek -i input.mp4 -ss 1 -t 3 -acodec copy -vcodec copy
>> -y out.mp4
>>
>> I believe that there must be some ffmpeg option to accomplish it (I
>> cannot find it in "man page").
>>
>> Please, write me how I can do that.
>>
>> thanks in advance
>>
>>
>