warning: first frame is no keyframe

[jinbiao9504]

Summary of the bug:

I found an issue with VC-1 video:
When i seek to a position after playing a VC-1 video, a warning which says 'warning: first frame is no keyframe' is presented.
And the picture will be shortly not clear after seek. I think this is caused by the warinng.
The log and one of the VC-1 files about this issue is attached, is that an issue of ffplay?

How to reproduce:

ffplay 36_vc1_720x480_interlaced_advanced.m2ts
put down RIGHT key to seek

ffmpeg version:lastest

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[jinbiao9504]

I am sorry that I cannot upload a media file bigger than 2.5M

[Balling]

Cannot reproduce.

[jinbiao9504]

Hi Balling,
Thank you for your reply!
You cannot reproduce because the movie attached is too short to seek.
Is that a way(e.g. email or others) i can upload the whole movie(about 20M) to you.
I can only upload attachment less than 2.5M here.

[Balling]

You can just upload to ​https://streams.videolan.org/upload/ (click on FFmpeg, of course).

[jinbiao9504]

The whole vc1 file has been uploaded

[jinbiao9504]

Hi Balling，have you received my movie file？

[mkver]

Your files are ​here.

[Balling]

Same happens on a blu-ray I have of "Whiteout".

I did mention it here: ​https://trac.ffmpeg.org/ticket/8515#comment:3

[jinbiao9504]

Replying to Balling:

Same happens on a blu-ray I have of "Whiteout".

I did mention it here: ​https://trac.ffmpeg.org/ticket/8515#comment:3

Yes, I saw many keyframe flags.
The decode-function may be affected if the player find the wrong keyframe after seek?

[Balling]

Will just again point out that this can be only reproduced on bigger file here ​https://streams.videolan.org/ffmpeg/incoming/9863/36_vc1_720x480_interlaced_advanced.m2ts