![]() ![]() is it possible to set up a server to transcode/remux a file and immediately have the output file (from ffmpeg/whatever tool I'm using) streamed to the client? If so, what tools are required to accomplish this? Is it possible to use a media file segmenter to chop up a file as it's being transcoded or remuxed? I can get the Roku to play my completed MP4 files just fine via Apache/Rails.īut I'm wondering. I have tried using ffmpeg to remux the files and serve them immediately during the transcoding process, but they are unplayable until the write process is complete. I'm wondering if it is possible to transcode/remux the FLV files and stream them to the client on the fly, perhaps over HLS? I have a number of video files (mostly in FLV format (H.264/AAC)) that I would like to stream to a client, which in this case is a Roku box (that accepts MP4 (H.264/AAC) and HTTP Live Streaming (HLS)). The following sample code show how to initialize the H.264/AVC remux MFT and MP4 sink.įor H.I'm trying to teach myself a bit about video streaming and transcoding, with some Roku app development on the side. To instantiate a H.264/AVC remux MFT, set the correct input and output media types on the H.264/AVC remux MFT, set the input media type for the MP4 sink, and resolve the topology. ![]() If the number of reordered frame exceeds 64 with a long term reference frame present, the H.264/AVC remux MFT will interpolate a wrong PTS for that frame and output that frame at a wrong time. H.264/AVC remux MFT also identifies the IDR pictures in the bitstream and sets them as clean point with the MF attribute of MFSampleExtension_CleanPoint.Ĭurrently the H.264/AVC remux MFT can handle a maximum of 64 reordered frame. Each output sample from the H.264/AVC remux MFT shall have PTS, DTS, and sample duration. It performs PTS interpolation according to frame rate, the previous PTS, and the picture output order through Decoded Picture Buffering (DBP) bumping process as specified in Annex C.4.5.3 Bumping process of the H.264 AVC specification. H.264/AVC remux MFT honors the input presentation time stamps (PTS) in input samples and passes them to the output if they exist. ![]() H.264/AVC remux MFT linearly interpolates the decoding time stamps (DTS) for each compressed picture according to the frame rate. If frame rate information is not available, the default frame rate of 29.97 fps is used. If the information does not exist in the sequence parameter, the frame rate is calculated from the parameters in the input media type. The frame rate is calculated from the sequence parameter. Instead, the sample duration is calculated from the frame rate. Sample duration is ignored by the H.264/AVC remux, because the sample duration for a sample not containing a complete primary picture does not have clear meaning. So, the input media type of the H.264/AVC remux MFT is MFVideoFormat_H264_ES and the output media type of the H.264/AVC remux MFT is MFVideoFormat_H264, which will be automatically inserted into the topology resolver. Set the input media type of MP4 sink to MFVideoFormat_H264. Set the source output media type to MFVideoFormat_H264_ES, which indicates each sample might not contain a complete primary picture. How to use H.264/AVC Remux MFT and MP4 sink In this situation, the application needs to use a H.264/AVC remux MFT to convert the compressed samples not containing a complete primary picture before they are written into the MPEG-4 file container.
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