Updating the video converter

As a result, the SDL1 output device has also been removed and replaced by an SDL2 implementation.

Both the ffplay and opengl output devices have been updated to support SDL2.

While a few problems remain with respect to LFE channel and 32 bit sample handling, these are in the process of being fixed such that effort can be finally put in improving the encoder's speed and efficiency.

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Without further ado, here's the silver-lining for each one of the projects we sought to complete during this Summer of Code season: Stanislav Dolganov designed and implemented experimental support for motion estimation and compensation in the lossless FFV1 codec.

The design and implementation is based on the snow video codec, which uses OBMC.

This has been a long time coming but we wanted to give a proper closure to our participation in this run of the program and it takes time.

Sometimes it's just to get the final report for each project trimmed down, others, is finalizing whatever was still in progress when the program finished: final patches need to be merged, TODO lists stabilized, future plans agreed; you name it.

FFmpeg support for MPEG-4 ALS has been improved significantly by Umair's work.

We welcome him to keep maintaining his improvements and hope for great contributions to come.Current users and members of the community are invited to write a replacement program to fill the same niche that ffserver did using the new APIs and to contact us so we may point users to test and contribute to its development.FFmpeg 3.1.1, a new point release from the 3.1 release branch, is now available!Petru Rares Sincraian added several self-tests to FFmpeg and successfully went through the in-some-cases tedious process of fine tuning tests parameters to avoid known and hard to avoid problems, like checksum mismatches due to rounding errors on the myriad of platforms we support.His work has improved the code coverage of our self tests considerably.It mainly deals with a few ABI issues introduced in the previous release.

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