vqf: set packet duration

Fixes timestamp calculation.
The FATE reference is updated because timestamp calculations are now more
accurate. Previous timestamps were based on average bit rate.

libavformat/vqf.c

@@ -201,7 +201,7 @@ static int vqf_read_header(AVFormatContext *s)
         return -1;
     }
     c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
-    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
+    avpriv_set_pts_info(st, 64, size, st->codec->sample_rate);
 
     /* put first 12 bytes of COMM chunk in extradata */
     if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE)))
@@ -225,6 +225,7 @@ static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
 
     pkt->pos          = avio_tell(s->pb);
     pkt->stream_index = 0;
+    pkt->duration     = 1;
 
     pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
     pkt->data[1] = c->last_frame_bits;

tests/ref/fate/vqf-demux

-178a10705baabc5b82bd79240f38a700
+d72fb75fb22f4bcc94a1dc7af5356ec1