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ffmpeg: Fail if the user requested impossible subtitle encoding.

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Fixes ticket #7239.
This commit is contained in:
Carl Eugen Hoyos 2018-06-06 21:09:38 +02:00
parent cf81a9c078
commit 5686c4489a
1 changed files with 17 additions and 0 deletions
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17
fftools/ffmpeg.c
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@ -3485,6 +3485,23 @@ static int init_output_stream(OutputStream *ost, char *error, int error_len)
return ret;
}
}
if (ist && ist->dec->type == AVMEDIA_TYPE_SUBTITLE && ost->enc->type == AVMEDIA_TYPE_SUBTITLE) {
int input_props = 0, output_props = 0;
AVCodecDescriptor const *input_descriptor =
avcodec_descriptor_get(dec->codec_id);
AVCodecDescriptor const *output_descriptor =
avcodec_descriptor_get(ost->enc_ctx->codec_id);
if (input_descriptor)
input_props = input_descriptor->props & (AV_CODEC_PROP_TEXT_SUB | AV_CODEC_PROP_BITMAP_SUB);
if (output_descriptor)
output_props = output_descriptor->props & (AV_CODEC_PROP_TEXT_SUB | AV_CODEC_PROP_BITMAP_SUB);
if (input_props && output_props && input_props != output_props) {
snprintf(error, error_len,
"Subtitle encoding currently only possible from text to text "
"or bitmap to bitmap");
return AVERROR_INVALIDDATA;
}
}
if ((ret = avcodec_open2(ost->enc_ctx, codec, &ost->encoder_opts)) < 0) {
if (ret == AVERROR_EXPERIMENTAL)