static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size)
{
GXFStreamContext *sc = ctx->fc->streams[pkt->stream_index]->priv_data;
- int64_t dts = av_rescale_rnd(pkt->dts, ctx->sample_rate, sc->codec->time_base.den, AV_ROUND_UP);
+ unsigned field_nb;
+ /* If the video is frame-encoded, the frame numbers shall be represented by
+ * even field numbers.
+ * see SMPTE360M-2004 6.4.2.1.3 Media field number */
+ if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
+ field_nb = ctx->nb_fields;
+ } else {
+ field_nb = av_rescale_rnd(pkt->dts, ctx->sample_rate, sc->codec->time_base.den, AV_ROUND_UP);
+ }
put_byte(pb, sc->media_type);
put_byte(pb, sc->index);
- put_be32(pb, dts);
+ put_be32(pb, field_nb);
if (sc->codec->codec_type == CODEC_TYPE_AUDIO) {
put_be16(pb, 0);
put_be16(pb, size / 2);
put_be24(pb, 0);
} else
put_be32(pb, size);
- put_be32(pb, dts);
+ put_be32(pb, field_nb);
put_byte(pb, 1); /* flags */
put_byte(pb, 0); /* reserved */
return 16;