On 24/05/18 12:52, Phillipe Laterrade wrote: > Setting the qpmin parameter to 12 changes (and reduce) the > pic_init_qp_minus26... > Is it the right way to fix this issue?
Well, what is going wrong with the existing values? They are allowed by the standard so all decoders supporting >8-bit profiles have to handle then - if you have something which doesn't then you might want to report a bug against it so it can be fixed. As a workaround for a broken device which doesn't handle the full range of QP, then yes setting qmin to constrain the encoder making the stream is probably a reasonable strategy. - Mark > -----Message d'origine----- > De : ffmpeg-user [mailto:[email protected]] De la part de Mark > Thompson > Envoyé : jeudi 24 mai 2018 12:22 > À : [email protected] > Objet : Re: [FFmpeg-user] h264 pic_init_qp_minus26 out of range > > On 24/05/18 10:46, Phillipe Laterrade wrote: >> Hello, >> >> >> >> I'm experiencing a problem when transcoding to h264 : >> >> The pic_init_qp_minus26 parameter is out of range (-28,-30,-31..) on >> some files but not on the whole transcoded files. > > The range of pic_init_qp_minus26 is [-26 - 6 * bit_depth_luma_minus8, +25]. > Does your file have a bit depth greater than 8? _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
