[FFmpeg-soc] [soc] Don't reuse the user's AVCodecContext for the first decoding thread, and copy more values between them as needed.

[Alexander Strange]

This fixes a large class of race conditions (coded_frame works again) and should improve frame dropping.
---
 libavcodec/mpegvideo.c |    1 -
 libavcodec/pthread.c   |   79 ++++++++++++++++++++++++++++++++++++++++-------
 libavcodec/utils.c     |    2 +-
 mt-work/todo.txt       |    4 +--
 4 files changed, 69 insertions(+), 17 deletions(-)
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