Hi Bill I've found this: Constrained Baseline Profile (CBP, 66 with constraint set 1) Primarily for low-cost applications, this profile is most typically used in videoconferencing and mobile applications. It corresponds to the subset of features that are in common between the Baseline, Main, and High Profiles. Baseline Profile (BP, 66) Primarily for low-cost applications that require additional data loss robustness, this profile is used in some videoconferencing and mobile applications. This profile includes all features that are supported in the Constrained Baseline Profile, plus three additional features that can be used for loss robustness (or for other purposes such as low-delay multi-point video stream compositing). The importance of this profile has faded somewhat since the definition of the Constrained Baseline Profile in 2009. All Constrained Baseline Profile bitstreams are also considered to be Baseline Profile bitstreams, as these two profiles share the same profile identifier code value. This maybe means that from a functional point of view they are interchangeable? Thanks Best regards A. Fennell

Hi, I tried to find those "three additional features" in the H264 specification and gave up. The spec is pretty dense to say the least, and the function of the constraint bits is not clearly described. But clearly there used to be a substantive difference between constrained baseline and baseline. I don't know how the spec changed in 2009. I think you're asking good questions. If you find the answers, please share. Regards, Bill On 9/2/2015 12:33 PM, a.fennell wrote: > > Hi Bill > I've found this: > > *Constrained Baseline Profile (CBP, 66 with constraint set 1)* > Primarily for low-cost applications, this profile is most typically > used in videoconferencing and mobile applications. It corresponds to > the subset of features that are in common between the Baseline, Main, > and High Profiles. > > *Baseline Profile (BP, 66)* > Primarily for low-cost applications that require additional data loss > robustness, this profile is used in some videoconferencing and mobile > applications. This profile includes all features that are supported in > the Constrained Baseline Profile, plus three additional features that > can be used for loss robustness (or for other purposes such as > low-delay multi-point video stream compositing). *The importance of > this profile has faded somewhat since the definition of the > Constrained Baseline Profile in 2009. All Constrained Baseline Profile > bitstreams are also considered to be Baseline Profile bitstreams, as > these two profiles share the same profile identifier code value.* > * > * > This maybe means that from a functional point of view they are > interchangeable? > Thanks > > Best regards > A. Fennell > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip@lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org