[Libav-user] Speeding up H264 decoding

[Simon Brown]

That's excellent - thank you.  I had changed number of threads, but only
after the codec was opened.

The CPU is a dual core Cortex-A9 running at 950MHz.  There is no hardware
coprocessor, so was hoping to eek out what I could from this.

I know FFMpeg has some Neon options (and the libraries have been built with
HAVE_NEON=1, but does anyone know how much of the H.264 decoder has Neon
code, if any?

Cheers,
Simon

On 8 September 2016 at 11:11, Puneet Kapoor <puneet.cse.iitd at gmail.com>
wrote:

> I had a similar question sometime back.
> Try following this thread: https://ffmpeg.org/pipermail/libav-user/2016-
> July/009365.html see if it helps you.
>
> Cheers
>
> On Thu, Sep 8, 2016 at 11:36 AM, Nikita Orlov <nikitos1550 at yandex.ru>
> wrote:
>
>> Hi!
>>
>> Which cpu do you use? Most probably there is hardware decoder. Current
>> cpu usually can decode 4K at 30
>> some FullHD at 30 at least.
>>
>> Another thing, that maybe can suit your case, is to prepare video
>> optimized for decode.
>> Very simple optimization is to use simplest profile - baseline. I believe
>> that there are some other options
>> to increase decoding speed, you have to google them.
>>
>> 08.09.2016, 00:41, "Simon Brown" <simon.k.brown at gmail.com>:
>>
>> Thank you - I tried that, but got no noticeable difference.
>>
>> On 7 September 2016 at 16:59, Kristijonas Malisauskas <km at sportcaster.dk>
>> wrote:
>>
>> First thing i would suggest doing is setting your AVCodecContext to use
>> more threads
>>
>> for ex: videoCtx->thread_count = 4;
>>
>> On Wed, Sep 7, 2016 at 3:05 PM, Simon Brown <simon.k.brown at gmail.com>
>> wrote:
>>
>> I'm running a decode operation using doc/examples/demuxing_decoding.c
>> I'm running on an Arm A9 with Neon enabled.  Sending a 1280x720p stream at
>> 24fps it can only decode about 15fps.  Is there any way of speeding up the
>> decode operation?
>>
>> Regards,
>> Simon
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>>
>> --
>> Nikita Orlov
>> Skype: nik_stet
>> QQ: 2717846083
>>
>>
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