[FFmpeg-devel] [PATCH] ffmpeg_filter: refuse to configure input without a decoder.

Nicolas George george at nsup.org
Fri Jul 18 10:43:22 CEST 2014

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)"

Signed-off-by: Nicolas George <george at nsup.org>
 ffmpeg_filter.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ffmpeg_filter.c b/ffmpeg_filter.c
index 50ee422..b6dc42f 100644
--- a/ffmpeg_filter.c
+++ b/ffmpeg_filter.c
@@ -830,6 +830,12 @@ static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
     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);
+    }
     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);

More information about the ffmpeg-devel mailing list