6/15/2023 0 Comments Ffmpeg vcodec h264![]() Start a new fragment at each video keyframe.Ĭreate fragments that are duration microseconds long.Ĭreate fragments that contain up to size bytes of payload data.Īllow the caller to manually choose when to cut fragments, by calling av_write_frame(ctx, NULL) to write a fragment with the packets written so far. If the space reserved is insufficient, muxing will fail. Reserves space for the moov atom at the beginning of the file instead of placing the moov atom at the end. The downside is that it is less compatible with other applications.įragmentation is enabled by setting one of the AVOptions that define how to cut the file into fragments: Writing a fragmented file has the advantage that the file is decodable even if the writing is interrupted (while a normal MOV/MP4 is undecodable if it is not properly finished), and it requires less memory when writing very long files (since writing normal MOV/MP4 files stores info about every single packet in memory until the file is closed). Normally, a MOV/MP4 file has all the metadata about all packets stored in one location (written at the end of the file, it can be moved to the start for better playback by adding faststart to the movflags, or using the qt-faststart tool).Ī fragmented file consists of a number of fragments, where packets and metadata about these packets are stored together. ![]() The mov/mp4/ismv muxer supports fragmentation. ![]() ![]() In this section, we'll try to create the necessary files for MS Smooth Streaming using ffmpeg.Īccording to MOV/MP4/ISMV (Smooth Streaming) muxer, we can use following options. ![]()
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