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lavf/webvttenc: Require webvtt file to contain exactly one WebVTT stream. 

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-dev@c-14.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b84232694e)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Simon Thelen 2015-09-11 21:49:07 +02:00 committed by Michael Niedermayer
parent 04ad22d77a
commit d1de492330
1 changed files with 6 additions and 0 deletions
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6
libavformat/webvttenc.c
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@ -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");