Addresses the issue reported in ticket #4609.
Unified · Split
| @@ -177,8 +177,8 @@ static int webp_write_trailer(AVFormatContext *s) · 176 unmodified lines | |||
| 177 | 177 | ||
| 178 | if (w->using_webp_anim_encoder) { | 178 | if (w->using_webp_anim_encoder) { |
| 179 | if (w->loop) { // Write loop count. | 179 | if (w->loop) { // Write loop count. |
| 180 | avio_seek(s->pb, 42, SEEK_SET); | 180 | if (avio_seek(s->pb, 42, SEEK_SET) == 42) |
| 181 | avio_wl16(s->pb, w->loop); | 181 | avio_wl16(s->pb, w->loop); |
| 182 | } | 182 | } |
| 183 | } else { | 183 | } else { |
| 184 | int ret; | 184 | int ret; |
| @@ -186,10 +186,11 @@ static int webp_write_trailer(AVFormatContext *s) · 1 unmodified line | |||
| 186 | return ret; | 186 | return ret; |
| 187 | 187 | ||
| 188 | filesize = avio_tell(s->pb); | 188 | filesize = avio_tell(s->pb); |
| 189 | avio_seek(s->pb, 4, SEEK_SET); | 189 | if (avio_seek(s->pb, 4, SEEK_SET) == 4) { |
| 190 | avio_wl32(s->pb, filesize - 8); | 190 | avio_wl32(s->pb, filesize - 8); |
| 191 | // Note: without the following, avio only writes 8 bytes to the file. | 191 | // Note: without the following, avio only writes 8 bytes to the file. |
| 192 | avio_seek(s->pb, filesize, SEEK_SET); | 192 | avio_seek(s->pb, filesize, SEEK_SET); |
| 193 | } | ||
| 193 | } | 194 | } |
| 194 | 195 | ||
| 195 | return 0; | 196 | return 0; |