[FFmpeg-devel] Bug

Lou Logan lou at lrcd.com
Sat Oct 15 21:22:30 CEST 2011

On Sat, 15 Oct 2011 11:56:19 -0700 (PDT), Hardik Sharma wrote:

> Chanchal
> Following is my command line to encode-
> ffmpeg -y -s 352x288 -r 30 -pix_fmt yuv420p -f rawvideo -i
> foreman_cif.yuv -vcodec libx264 -y -b 512k -r 30 -preset fast -s
> 352x288 -flags +loop -cmp +chroma -flags2 -fastpskip -partitions
> +parti4x4+partp8x8+partb8x8+parti8x8+partp4x4 -chromaoffset 0
> -b_qfactor 0.45 -flags2 +wpred -subq 9 -flags2 +mixed_refs -flags2
> +dct8x8 -me_range 32 -me_method umh -strict 1 -sc_threshold 40
> -vstats -i_qfactor 0.71 -qcomp 0.5 -rc_eq 'blurCplx^(1-qComp)' -level
> 40 -flags2 -bpyramid -coder 1 -refs 6 -x264opts
> slice-max-size=300:bframes=1:keyint=20:no-interlaced=1:trellis=2:subme=10
> -f h264 -mbd 1 -profile high -deblockalpha 0 -deblockbeta 0 -threads
> 0 out1.264
> Then I started dropping every slice one by one. For many slices the
> concealment is not working (my guess) because as I drop that slice,
> decoder dropped the whole frame. I am decoding this sequence back to
> yuv format as I encoded the raw yuv format to 264 initially.
> Decoding command line-
> ffmpeg -b 512k -s 352x288 -r 30 -i out1.264 -b 512k -s 352x288 -r 30
> -y out1.yuv 
> Let me know if you want to know any other detail.

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