Not requiring this can end up producing hilariously broken files
together with -c:s copy (e.g. a webvtt file containing binary subtitle data).
Signed-off-by: Simon Thelen <ffmpeg-...@c-14.de>
---
libavformat/webvttenc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavformat/webvttenc.c b/libavformat/webvttenc.c
index b93993d..c386538 100644
--- a/libavformat/webvttenc.c
+++ b/libavformat/webvttenc.c
@@ -46,8 +46,14 @@ static void webvtt_write_time(AVIOContext *pb, int64_t
millisec)
static int webvtt_write_header(AVFormatContext *ctx)
{
AVStream *s = ctx->streams[0];
+ AVCodecContext *avctx = ctx->streams[0]->codec;
AVIOContext *pb = ctx->pb;
+ if (ctx->nb_streams != 1 || avctx->codec_id != AV_CODEC_ID_WEBVTT) {
+ av_log(ctx, AV_LOG_ERROR, "Exactly one WebVTT stream is needed.\n");
+ return AVERROR(EINVAL);
+ }
+
avpriv_set_pts_info(s, 64, 1, 1000);
avio_printf(pb, "WEBVTT\n");
--
2.5.1
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