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ffmpeg_filter: refuse to configure input without a decoder.

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The decoder is necessary in order to filter frames.
This makes the error message clearer in this case:
currently, it will usually fail because the pixel or sample
format is not defined and is converted into "(null)"
(non-portable).

Enhance trac ticket #3779.
(cherry picked from commit 91244073fd8b983e7cd1f97da83daf956fbbddc6)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Nicolas George 2014-07-18 10:34:39 +02:00 committed by Michael Niedermayer
parent f99b17bd32
commit f7b147548e
1 changed files with 6 additions and 0 deletions
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6
ffmpeg_filter.c
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@ -828,6 +828,12 @@ static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
av_freep(&ifilter->name);
DESCRIBE_FILTER_LINK(ifilter, in, 1);
if (!ifilter->ist->dec) {
av_log(NULL, AV_LOG_ERROR,
"No decoder for stream #%d:%d, filtering impossible\n",
ifilter->ist->file_index, ifilter->ist->st->index);
return AVERROR_DECODER_NOT_FOUND;
}
switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);