[Libav-user] Trouble Decoding with h264_qsv

[Attila Krüpl]

avcodec_decode_video2 is a deprecated function, so the success of usage
depends on what version of LibAV you are using.
If decoding is not working for you it might be worth to turn on logging
with av_log_set_level(AV_LOG_TRACE) and add an own logger callback so you
can define the output with av_log_set_callback(). Once you receive error
codes it's much simpler to configure the codec, because you can see what
the mistake is.

Best Regards,

Attila


On Wed, 22 Jan 2020 at 19:56, Philippe Noël <
philippe_noel at college.harvard.edu> wrote:

> I don't think this is a sufficient test as no hardware decoder has as
>> many features
>> as the libavcodec h264 decoder. Did you test with ffmpeg (the command line
>> interface)?
>
>
> Yes sorry, I have tested with ffmpeg cmd line and it works fine, so I'm
> fairly sure there's something I'm missing in the C code using libav. Not
> sure if that changes anything, but I am encoding with Nvenc and trying to
> decode with QSV.
>
> Any ideas what I could be missing in the code above?
>
> Philippe
>
> On Wed, Jan 22, 2020 at 1:23 PM Carl Eugen Hoyos <ceffmpeg at gmail.com>
> wrote:
>
>> Am Mi., 22. Jan. 2020 um 18:16 Uhr schrieb Philippe Noël
>> <philippe_noel at college.harvard.edu>:
>>
>> > I know that my packets are encoded correctly, because the decoding works
>> > well when I just use AV_CODEC_ID_H264.
>>
>> I don't think this is a sufficient test as no hardware decoder has as
>> many features
>> as the libavcodec h264 decoder. Did you test with ffmpeg (the command line
>> interface)?
>>
>> Carl Eugen
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