On 08/25/2017 05:35 PM, wm4 wrote:
+ /* + * increase the number of buffers to support h.264/h.265 + * default (configurable via option) is 16 + */ + switch (avctx->codec_id) { + case AV_CODEC_ID_H264: + case AV_CODEC_ID_HEVC: + output->num_buffers += 4; + break; + }That sounds questionable. The maximum DPB for h264 and HEVC are usually put at 16. So it should add 14 buffers, assuming traditional MPEG codecs use 2. VP9 uses something between.
ffmpeg will request 20 out buffers (ie, input frames to the driver) in this case (16 + 4). The kernel _driver_ might return more or less depending on what the hardware can handle and the codec_id.
this is just a tentative... _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
