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);
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
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