[FFmpeg-user] Question about pic_init_qs_minus26 in PPS

[julien daniel]

I don't really understand why but if i adjust my command with :

nal-hrd=vbr:vbv-bufsize=35000:vbv-maxrate=25000\

as this :

ffmpeg -y -i $FFLESMEDIAS/$_elem1.mov -flags +ildct -c:v libx264 -vprofile
high422 -level 4.1  -tune:v film -preset:v slow  -b:v 25000k -x264opts
\"ref=2:keyint=27:min-keyint=1:slices=1:b_pyramid=0:nal-hrd=vbr:vbv-bufsize=35000:vbv-maxrate=25000\"
-pass 1 -filter_complex \"[0:0] [0:1] amerge\" -c:a libfdk_aac -b:a 320k
-ar:a 48k -f mp4 /dev/null &&

and the same with the 2nd pass i don't have the error anymore.

Maybe an explanation ...

Julien



Julien Daniel
Etalonneur
06 71 63 63 28
Les Films du Soleil <http://www.filmsdusoleil.com/fr/post-production/>



2015-06-25 13:52 GMT+02:00 julien daniel <j.delarita at gmail.com>:

> Hello,
> I encode an ProRes422(HQ) file to H264 422 10bit in two pass
> with those commands:
> ffmpeg -y -i /Volumes/HyperFS1/file.mov -flags +ildct \
> -c:v libx264 -vprofile high422 -level 4.1 -tune:v film -preset:v slow
>  -b:v 25000k  \
> -x264opts "ref=2:keyint=27:min-keyint=1:slices=1:b_pyramid=0" -pass 1 \
> -filter_complex "[0:0] [0:1] amerge" -c:a libfdk_aac -b:a 320k -ar:a 48k \
> -f mp4 /dev/null && \
>
> the command for pass 2 is strictly identical except : -pass 2 and output
> to /Volumes/HyperFS1/file.mp4
>
> Here the consol output : pastebin.com/4xzTfKhF
> I then send the file to a Baton QC account.
>
> Here the output : pastebin.com/UTMyGzfc
>
> It seems there is an error on pic_init_qs_minus26 value in PPS.
>
> I really dont' know wich  are the parameter that influence this.
> Any help will be really welcome.
>
> Julien Daniel
>