On 26/04/2020 19:08, David Manouchehri wrote:
> This patch allows you to output non-rawvideos to V4L2, which can be quite
> helpful at times when you'd like to offer a compressed source (see example
> usage below).
>
> ffmpeg -vaapi_device /dev/dri/renderD129 -f v4l2 -input_format yuyv422 -i
> /dev/video2 -f v4l2 -vf 'format=nv12,hwupload' -c:v h264_vaapi /dev/video4
>
> From ce5f0ebd8e1d40b0f876b0d1b0b0cf564389b874 Mon Sep 17 00:00:00 2001
> From: Roger <rog...@users.noreply.github.com>
> Date: Sat, 4 Nov 2017 16:32:41 -0400
> Subject: [PATCH] avdevice/v4l2enc: Allow writing h264 to v4l2.
>
> Signed-off-by: David Manouchehri <david.manouche...@riseup.net>
> ---
> libavdevice/v4l2enc.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/libavdevice/v4l2enc.c b/libavdevice/v4l2enc.c
> index 1c36f81f90..afbd94f8da 100644
> --- a/libavdevice/v4l2enc.c
> +++ b/libavdevice/v4l2enc.c
> @@ -47,8 +47,7 @@ static av_cold int write_header(AVFormatContext *s1)
> }
>
> if (s1->nb_streams != 1 ||
> - s1->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ||
> - s1->streams[0]->codecpar->codec_id != AV_CODEC_ID_RAWVIDEO) {
> + s1->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
> av_log(s1, AV_LOG_ERROR,
> "V4L2 output device supports only a single raw video
> stream\n");
> return AVERROR(EINVAL);
> @@ -56,7 +55,7 @@ static av_cold int write_header(AVFormatContext *s1)
>
> par = s1->streams[0]->codecpar;
>
> - v4l2_pixfmt = ff_fmt_ff2v4l(par->format, AV_CODEC_ID_RAWVIDEO);
> + v4l2_pixfmt = ff_fmt_ff2v4l(AV_PIX_FMT_NONE,
> s1->streams[0]->codecpar->codec_id);
I think you only want NONE for non-RAWVIDEO - the raw formats still need to be
mapped.
> if (!v4l2_pixfmt) { // XXX: try to force them one by one?
> av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for
> %s\n",
> av_get_pix_fmt_name(par->format));
> --
> 2.17.1
>
Seems like a nice change!
Thanks,
- Mark
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