This paper presents novel results concerning influences between ICT standards and their implementations in open source software (OSS). Specifically, findings draw from observations and analysis related to the ITU-T H.264 standard and the two OSS projects OpenH264 and x264 that both implement the standard. The study reports on a characterisation of organisations that influence and control the H.264 standard, organisations that influence and control OSS projects implementing the H.264 standard, and influences between contributors involved with the H.264 standard and OSS projects implementing that standard. Further, projects for standardisation and implementation of H.264 are contrasted with respect to mix of contributing organisations, and findings are related to organisational strategies of contributing organisations and previous research.