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doc/examples/transcoding: check encoder before using it 

Fixes null pointer exception

Found-by: stoupeace
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-04 18:58:38 +01:00
parent cbf09545f2
commit bde27e1e61
1 changed files with 4 additions and 0 deletions
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4
doc/examples/transcoding.c
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@ -116,6 +116,10 @@ static int open_output_file(const char *filename)
|| dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
/* in this example, we choose transcoding to same codec */
encoder = avcodec_find_encoder(dec_ctx->codec_id);
if (!encoder) {
av_log(NULL, AV_LOG_FATAL, "Neccessary encoder not found\n");
return AVERROR_INVALIDDATA;
}
/* In this example, we transcode to same properties (picture size,
* sample rate etc.). These properties can be changed for output