transcode: add chroma conversion to be the first filter if needed

For example croppadd doesn't like if input and output chromas are not the same.
This is visible for example webcam input and h264 encode (YUV2->I420).

Reported by: Jean-Paul Saman

diff --git a/modules/stream_out/transcode/video.c b/modules/stream_out/transcode/video.c
index 92f4d8d0cebfaf9bd814483faa3b16094fa73fc7..6716cc715b0d2592c3672755891f10d097814656 100644 (file)
--- a/modules/stream_out/transcode/video.c
+++ b/modules/stream_out/transcode/video.c
@@ -337,6 +337,13 @@ static void transcode_video_filter_init( sout_stream_t *p_stream,
                            p_stream->p_sys );
         filter_chain_Reset( id->p_uf_chain, p_fmt_out,
                             &id->p_encoder->fmt_in );
+        if( p_fmt_out->video.i_chroma != id->p_encoder->fmt_in.video.i_chroma )
+        {
+            filter_chain_AppendFilter( id->p_uf_chain,
+                                   NULL, NULL,
+                                   p_fmt_out,
+                                   &id->p_encoder->fmt_in );
+        }
         filter_chain_AppendFromString( id->p_uf_chain, p_stream->p_sys->psz_vf2 );
         p_fmt_out = filter_chain_GetFmtOut( id->p_uf_chain );
         es_format_Copy( &id->p_encoder->fmt_in, p_fmt_out );