Following this is not strictly needed but safes some malloc+free
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
* can use this AVCodecContext to decode/encode video/audio data.
*
* @param dest target codec context, should be initialized with
- * avcodec_alloc_context3(), but otherwise uninitialized
+ * avcodec_alloc_context3(NULL), but otherwise uninitialized
* @param src source codec context
* @return AVERROR() on error (e.g. memory allocation error), 0 on success
*/