h265 extremely slow seek in mp4

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Ibizanhound
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h265 extremely slow seek in mp4

Postby Ibizanhound » Tue Jan 23, 2018 6:53 am

Hello Mediacoder community!
I have been looking into Fast Forward and Rewind in Mp4 videos and what they depend on and realized that the lower the GOP value is, the faster the seeking times in an mp4 video (in windows media player).

This applies perfectly when I encode with NVENC and using the H264 format.
But when I try with the H265, fast forward becomes impossible regardless of how low the GOP is.
I have read a suggestion that with H265, the parameter open-GOP should be disabled,
but that's disabled in Mediacoder by default, right?

Does anyone know if there is anything else I can do to achieve fast seeking times in H265?
Thank you!
stanley
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Re: h265 extremely slow seek in mp4

Postby stanley » Wed Jan 24, 2018 12:48 am

Try setting muxer to ffmpeg.
When things work together, things work.
Ibizanhound
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Re: h265 extremely slow seek in mp4

Postby Ibizanhound » Thu Jan 25, 2018 12:32 am

@ stanley Nope, unfortunately this didn't help. Thank you for the suggestion though!
Ibizanhound
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Re: h265 extremely slow seek in mp4

Postby Ibizanhound » Thu Jan 25, 2018 7:37 am

I just spent the whole day experimenting with different settings in Mediacoder, even though I can make the NVENC work with H264 format,
which means really fast encoding times and fast forward ability thanks to setting the value of GOP at 33 in the NVENC settings,
still I feel the quality of H265 is slightly better,
but unfortunately despite my efforts the GOP value doesn't seem to affect the H265 format in order to be able to seek fast enough to support a fast forward feature.
At least in windows media player...
I am suspecting it might have to do with the level of compression that H265 has as a format by default.
Any thoughts?

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