[FFmpeg-devel] [PATCH]Set dwSuggestBufferSize for video streams in avi

[Carl Eugen Hoyos]

Hi!

Attached patch fixes playback of avi files with large video frames with older 
WMP as described in a comment in ticket #2145 (not reproducible with current 
WMP).
It may fix ticket #2818.

Should the value never be set smaller than 1024x1024?

Please comment, Carl Eugen
-------------- next part --------------
diff --git a/libavformat/avienc.c b/libavformat/avienc.c
index 89e2a53..18871ec 100644

Index: libavformat/avienc.c
===================================================================
--- a/libavformat/avienc.c
+++ b/libavformat/avienc.c
@@ -64,6 +64,7 @@ typedef struct  {
     int64_t audio_strm_length;
     int packet_count;
     int entry;
+    int max_size;
 
     AVIIndex indexes;
 } AVIStream;
@@ -628,6 +629,7 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
         idx->cluster[cl][id].flags = flags;
         idx->cluster[cl][id].pos   = avio_tell(pb) - avi->movi_list;
         idx->cluster[cl][id].len   = size;
+        avist->max_size = FFMAX(avist->max_size, size);
         idx->entry++;
     }
 
@@ -689,6 +691,10 @@ static int avi_write_trailer(AVFormatContext *s)
             av_freep(&avist->indexes.cluster[j]);
         av_freep(&avist->indexes.cluster);
         avist->indexes.ents_allocated = avist->indexes.entry = 0;
+        if (pb->seekable) {
+            avio_seek(pb, avist->frames_hdr_strm + 4, SEEK_SET);
+            avio_wl32(pb, avist->max_size);
+        }
     }
 
     return res;