Is there a way of knowing whether I seek outside of a video when using the
SEEK_BACKWARD flag?
I noticed that when I change the flag for av_seek_frame to something else than
AVSEEK_FLAG_ANY, I always get 0 returned. If I seek somewhere beyond the video
length, I can even can call avcodec_decode_video2 afterwards and get a frame
decode (just zeros it seems), without any complains. Only sws_scale() later in
the pipeline gives a warning about incorrect image pointers.
For now I worked around by calling av_seek_frame with AVSEEK_FLAG_ANY and if
that is successful, seek again with SEEK_BACKWARD. But ideally, I would like to
seek only once. Is there reason why only AVSEEK_FLAG_ANY detects if a seek was
successful? I.e. is there a possibility that ticket #1607 [0] could be fixed?
Is there maybe a function I have overlooked that I can call to query the video
length?
Cheers,
Peter
[0] https://trac.ffmpeg.org/ticket/1607 <https://trac.ffmpeg.org/ticket/1607>
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