[Libav-user] Where and how to add a custom hardware decoder in libavcodec ?

[ssshukla26]

Hi, 

I am new to ffmpeg, am working on a *custom board* which has its own
hardware decoder. 

I have a linux application for hardware decoder which take a h264 file as
input and provides a yuv file as output. It working fine, now we are
extending this support to *gstreamer* and *ffmpeg* libraries. I am familiar
with gstreamer but new to ffmpeg. 

I just need some quick suggestions on where to add a new decoder and an
example (in ffmpeg source) on how to do that ! 

Please guyz help me.



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Re: [Libav-user] Converting from 25 to 29.97fps

[Ratin]

buffer the decoded frames for a few hundred millisecond and queue the
frames and then render at a particular interval

On Thu, May 26, 2016 at 7:11 PM, Scott  wrote:

> I am converting a 25fps mp4 file to VCD format (ntsc). It's watchable
> but I notice "flickering pixels" that occur during
> playback. Parts of the image become mildly blurred then quickly flick
> back. I'm assuming this is because of mismatched frame rates. Are they
> ways of mitigating this "flickering" via filters? Thank you.
>
> -s
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[Libav-user] Odd problem after encoding video

[Kristijonas Malisauskas]

Hello,

I am encoding video with a new framerate expecting a slowdown or speed up
in the final result.
Odd thing is: "Videos" or ffmpeg player seems to give me expected results
while VLC plays the video at the same-ish framerate (makes no difference
what FPS I set)

Encoder setup:

out_codec = avcodec_find_encoder(AV_CODEC_ID_H264);
if (!out_codec) {
cout << "out_codec found" << endl;
exit(1);
}

pOutputContext = avcodec_alloc_context3(out_codec);
if (!pOutputContext) {
cout << "Could not allocate video codec context" << endl;
exit(1);
}

// put sample parameters
pOutputContext->bit_rate = FILE_OUTPUT_WIDTH * FILE_OUTPUT_HEIGHT * 4;

pOutputContext->width = FILE_OUTPUT_WIDTH;
pOutputContext->height = FILE_OUTPUT_HEIGHT;

// frames per second
pOutputContext->time_base.den = OUT_FRAMERATE; //FPS
pOutputContext->time_base.num = 1;

pOutputContext->gop_size = 10;

pOutputContext->max_b_frames = 1;

pOutputContext->pix_fmt = AV_PIX_FMT_YUV420P;

av_opt_set(pOutputContext->priv_data, "preset", "slow", 0);



Any thoughts what might cause this behaviour?

/Kris
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Re: [Libav-user] how to predict the size of destination clips

[Слободенюк Александр Игоревич]

I second that, I would love how to know at least the upper bound estimate for the file size of an encoded video before I encode it. this can be something like this: AVCodecContext->max_bitrate * (duration_in_secs / 8)   [ bytes ] -- С уважением,Слободенюк Александр Игоревич контактный телефон: +7-925-050-64-62   02.06.2016, 15:59, "Peter Steinbach" :I second that, I would love how to know at least the upper bound estimate for the file size of an encoded video before I encode it.Best,Peter___Libav-user mailing listLibav-user@ffmpeg.orghttp://ffmpeg.org/mailman/listinfo/libav-user___
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Re: [Libav-user] how to predict the size of destination clips

[Peter Steinbach]

I second that, I would love how to know at least the upper bound 
estimate for the file size of an encoded video before I encode it.


Best,
Peter
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[Libav-user] how to predict the size of destination clips

[qw]

Hi,

Does ffmpeg provide some function that can predict the size of destination 
clips before transcoding?

Thanks!

B.R.

Andrew
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[Libav-user] how to know whether disk is full or not

[qw]

Hi,

If disk is full, does ffmpeg provide some functions to report full-disk error?

Thanks!

B.R.

Andrew
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