[FFmpeg-cvslog] ffmpeg: return no chosen output if an uninitialized stream is unavailable

ffmpeg | branch: release/4.4 | Jan Ekström | Thu May 6 23:31:44 2021 +0300| [70405dd7e31cd436e9ffa252124537df253a5dc3] | committer: Jan Ekström ffmpeg: return no chosen output if an uninitialized stream is unavailable Otherwise the rate emulation logic in `transcode_step` never gets hit, and

[FFmpeg-cvslog] ffmpeg: return no chosen output if an uninitialized stream is unavailable

ffmpeg | branch: master | Jan Ekström | Thu May 6 23:31:44 2021 +0300| [ec20b8130269260f3ae1e4642da26ba556814f84] | committer: Jan Ekström ffmpeg: return no chosen output if an uninitialized stream is unavailable Otherwise the rate emulation logic in `transcode_step` never gets hit, and the