h.264

I need some clarification on H264 NAL unit delimiter prefixes ( 00 00 00 01 and 00 00 01 ), I am using Intel Media SDK to generate a H264 and pack it into RTP. The issue is that so far I was looking only for 00 00 00 01 as a unit separator and basically was able to find only AUD,SPS,PPS and SEI units in the bitstream. Looking at the memory I saw that after the SEI there was a byte sequence 00 00 01 25 that could be a start of an IDR unit, but my search algorithm did not detect it because of a missing zero byte. Can anyone clarify the difference between 00 00 00 01 and 00 00 01 prefixes?

I have a confusion about the timestamp of h264 RTP packet. I know the wall clock rate of video is 90KHz which I defined in the SIP SDP. The frame rate of my encoder is not exactly 30 FPS, it is variable. It varies from 15 FPS to 30 FPS on the fly. So, I cannot use any fixed timestamp. Could any one tell me the timestamp of the following encoded packet. After 0 milisecond encoded RTP timestamp = 0 (Let the starting timestamp 0) After 50 milisecond encoded RTP timestamp = ? After 40 milisecond encoded RTP timestamp = ? After 33 milisecond encoded RTP timestamp = ? What is the formula when the

Thank you for your focus! I want to use Android MediaCodec APIs to encode the video frame which aquired from Camera, unfortunately, I have not success to do that! I still not familiar with the MediaCodec API。 The follow is my codes,I need your help to figure out what I should do. 1、The Camera setting: Parameters parameters = mCamera.getParameters(); parameters.setPreviewFormat(ImageFormat.NV21); parameters.setPreviewSize(320, 240); mCamera.setParameters(parameters); 2、Set the encoder: private void initCodec() { try { fos = new FileOutputStream(mVideoFile, false); } catch (FileNotFoundException

I have the h264 stream inAnnex B format and follow this link here to implements h264 decoding with iOS8 videoToolBox. I check the OSStatus in every step. use CMVideoFormatDescriptionCreateFromH264ParameterSets with the SPS and PPS data to create a CMFormatDescription.(status == noErr) create a VTDecompressionSession using VTDecompressionSessionCreate. (status == noErr) capture the NALUnit payload into a CMBlockBuffer making sure to replace the start code with a byte length code. (status == noErr) create a CMSampleBuffer. (status == noErr) use VTDecompressionSessionDecodeFrame and get error

I need to create video from images, I have seen jcodec and I think it is what I need: http://jcodec.org/ How do I add jcodec to my project? I have seen there is a version for android. Correct me if I am wrong, but I added jcodec-0.1.5.jar to my project under the libs folder. Then added SequenceEncoder.java and BitmapUtil.java from jcodec-android-0.1.7.zip to my package but when I add: public void encodeImage(Bitmap bi) throws IOException { encodeNativeFrame(BitmapUtil.fromBitmap(bi)); } It gives me error on package com.example.seqtest and asks me to configure build path. So how I use it, How

I'm trying to use Xuggler (which I believe uses ffmpeg under the hood) to do the following: Accept a raw MPJPEG video bitstream (from a small TTL serial camera) and encode/transcode it to h.264; and Accept a raw audio bitsream (from a microphone) and encode it to AAC; then Mux the two (audio and video) bitsreams together into a MPEG-TS container I've watched/read some of their excellent tutorials, and so far here's what I've got: // I'll worry about implementing this functionality later, but // involves querying native device drivers. byte[] nextMjpeg = getNextMjpegFromSerialPort(); // I'll

I have the FFMPEG streaming baseline h264 video, which I have to encapsulate in RTP and send to SIP phones for their decoding. I am using Linphone with the h264 plugin for Windows and Mirial for the decoding progress. However, sometimes I get a huge frame size (3Kb ~ 9Kb) from the FFMPEG, which obviously doesn't fit in the MTU. If I send these frames "as is" and trusting IP fragmentation feature, some phones are able to play it well enough, but others choke and can't decode the stream. I think this is because the stream is not compliant with the RFC 3984 that specifies that packets that don't