Re: [FFmpeg-devel] Flushing while decoding , but need already decoded frames

From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] Flushing while decoding , but need already decoded frames
Date: Fri, 24 May 2024 15:35:55 +0200
Message-ID: <GV1P250MB07379C7CB13729B43A091E1E8FF52@GV1P250MB0737.EURP250.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <AM9PR02MB685053B47A4F8AB6EC6BA9CFBCF52@AM9PR02MB6850.eurprd02.prod.outlook.com>

Michael Henrik Bodenhoff via ffmpeg-devel:
> Hi Andrey ,
> 
> "when the decoder is set up to ignore B frames"
> 
> How do you do that ? 😲
> 
> We must have missed something while we tried using FFmpeg, because we couldn't find a way of telling the decoder to ignore B frames, we actually got so desperate that we considered if it was possible to modify the incoming encoded stream to make FFmpeg believe that the stream doesn't contain B frames ☹
> 

There is AVCodecContext.skip_frame; some decoders (not all, but e.g.
H.264) will skip frames based upon this value. But it does not affect
the decoder delay.
(There is also AV_CODEC_FLAG_LOW_DELAY, but this is honored by even less
decoders (only some old ones).)

- Andreas

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