[FFmpeg-trac] #1882(avcodec:open): Multi-threading wmv encoder

FFmpeg trac at avcodec.org
Mon Nov 5 00:21:50 CET 2012

#1882: Multi-threading wmv encoder
             Reporter:  txspaderz    |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  wmv2         |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |

Comment (by xnejp03):

 Hi, I'm the author of the software. wmv2 is the only wmv-based encoder
 that FFmpeg supports, and is needed for on-the-fly transcoding for Xbox
 (among others). The encoder doesn't support -threads with value other than
 1. It's a major bottleneck, especially for HD videos. I'm not sure multi-
 threaded VC1 decoder will help, as the same will happen when transcoding
 (for example) MKV/H264 HD file.

 I appreciate wmv2 is deprecated, but this would really help a lot, unless
 there is a chance of  wmv3 encoder.

 Regarding -copyts: it's an attempt to keep audio/video in sync, but it
 might be completely inappropriate, the documentation on this parameter is
 a bit scarce :-)

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1882#comment:7>
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