[FFmpeg-devel] [PATCH] ffmpeg_filter: enable stream_loop in HWAccel transcoding.

[Jun Zhao]

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From 731b6cb1f3a13fa18cfe39c1ddba92050b999668 Mon Sep 17 00:00:00 2001
From: Jun Zhao <mypopydev at gmail.com>
Date: Wed, 14 Mar 2018 16:13:39 +0800
Subject: [PATCH] ffmpeg_filter: enable stream_loop in HWAccel transcoding.

use the cmd: ffmpeg -y -stream_loop 1 -hwaccel vaapi -hwaccel_device
/dev/dri/renderD128 -hwaccel_output_format vaapi -i
input.mp4 -c:v h264_vaapi output.mp4 can get the error like:

Error while decoding stream #0:1: Invalid data found when processing
input
Impossible to convert between the formats supported by the filter
'Parsed_null_0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented

the root cause is can't insert software scale filter in the hwaccel
transcoding pipeline.

Signed-off-by: Jun Zhao <mypopydev at gmail.com>
---
 fftools/ffmpeg_filter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 877fd670e6..c85dd7ae8d 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -452,6 +452,7 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
     int pad_idx = out->pad_idx;
     int ret;
     char name[255];
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(ofilter->format);
 
     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
     ret = avfilter_graph_create_filter(&ofilter->filter,
@@ -461,7 +462,8 @@ static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter,
     if (ret < 0)
         return ret;
 
-    if (ofilter->width || ofilter->height) {
+    if ((ofilter->width || ofilter->height) &&
+        (!desc || (desc && !(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)))) {
         char args[255];
         AVFilterContext *filter;
         AVDictionaryEntry *e = NULL;
-- 
2.14.1