Log Message:
Changes 1.2.6:
* avcodec/utvideoenc: fix slice_bits size
* avcodec/snow: split block clipping checks
* avcodec/ansi: fix integer overflow
* avcodec/msrle: use av_image_get_linesize() to calculate the linesize
* avformat/mpegtsenc: Check data array size in mpegts_write_pmt()
* avcodec/wmalosslessdec: fix mclms_coeffs* array size
* samplefmt: avoid integer overflow in av_samples_get_buffer_size()
* avcodec/vc1: reset fcm/field_mode in non advanced header parsing
* avcodec/takdec: always check bits_per_raw_sample
* avcodec/vmnc: Check  that rectangles are within the picture
* dnxhdenc: fix mb_rc size
* pthread_frame: flush all threads on flush, not just the first one
* rtpdec_asf: Copy the need_parsing field from the chained demuxer
* Fix compilation on ARM with android gcc 4.7
* Allow decoding of slightly broken Nikon avi files.