From: Andriy Gelman <andriy.gelman@gmail.com>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v5 5/7] avcodec/v4l2_context: resume the decoding process after source change event received.
Date: Tue, 4 Jan 2022 17:41:01 -0500
Message-ID: <20220104224101.gmkmes6kduelmdsl@jackie> (raw)
In-Reply-To: <20220104090836.31660-5-ming.qian@nxp.com>
On Tue, 04. Jan 17:08, Ming Qian wrote:
> client need to resume the decoding process
> after it dequeues the source change event.
> no matter what's the return value of v4l2_resolution_changed().
> if the client doesn't resume the decoding process,
> the decoder may keep waiting
>
> in documentation of v4l2 stateful decoder, we can see the following
> description:
> The client must continue the sequence as described below to
> continue the decoding process.
> 1. Dequeue the source change event.
> Important
> A source change triggers an implicit decoder drain,
> similar to the explicit Drain sequence. The decoder is
> stopped after it completes. The decoding process must be
> resumed with either a pair of calls to
> VIDIOC_STREAMOFF() and VIDIOC_STREAMON() on the CAPTURE
> queue, or a call to VIDIOC_DECODER_CMD() with the
> V4L2_DEC_CMD_START command.
> 2. Continue with the Capture Setup sequence.
>
This is just a clean up to remove the reinit variable so the commit title and
description are wrong.
Thanks,
--
Andriy
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next prev parent reply other threads:[~2022-01-04 22:41 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-04 9:08 [FFmpeg-devel] [PATCH v5 1/7] avcodec/v4l2_context: don't reinit output queue when dynamic resolution change Ming Qian
2022-01-04 9:08 ` [FFmpeg-devel] [PATCH v5 2/7] avcodec/v4l2_m2m: remove ff_v4l2_m2m_codec_full_reinit Ming Qian
2022-01-04 9:08 ` [FFmpeg-devel] [PATCH v5 3/7] avcodec/v4l2_context: add v4l2_start_decode Ming Qian
2022-01-04 22:37 ` Andriy Gelman
2022-01-04 9:08 ` [FFmpeg-devel] [PATCH v5 4/7] avcodec/v4l2_context: set resolution change if decoded format changed Ming Qian
2022-01-04 9:08 ` [FFmpeg-devel] [PATCH v5 5/7] avcodec/v4l2_context: resume the decoding process after source change event received Ming Qian
2022-01-04 22:41 ` Andriy Gelman [this message]
2022-01-12 4:44 ` Ming Qian
2022-01-04 9:08 ` [FFmpeg-devel] [PATCH v5 6/7] avcodec/v4l2_context: sync v4l2 context status with driver Ming Qian
2022-01-04 9:08 ` [FFmpeg-devel] [PATCH v5 7/7] avcodec/v4l2_m2m_dec: setup capture queue before enqueue the first frame Ming Qian
2022-03-21 7:27 ` [FFmpeg-devel] [EXT] " Ming Qian
2022-03-26 15:42 ` Andriy Gelman
2022-03-29 6:51 ` Ming Qian
2022-04-03 22:29 ` Andriy Gelman
2022-04-04 12:14 ` Ming Qian
2022-01-04 22:22 ` [FFmpeg-devel] [PATCH v5 1/7] avcodec/v4l2_context: don't reinit output queue when dynamic resolution change Andriy Gelman
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