diff options
Diffstat (limited to 'fftools/ffmpeg.c')
| -rw-r--r-- | fftools/ffmpeg.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c index 10f3012cdc..d4ac6903cc 100644 --- a/fftools/ffmpeg.c +++ b/fftools/ffmpeg.c @@ -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) |