更新手记

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Update Report of mpegCoder

V3.1.0 @ 7/23/2021:

1. Support str() type for all string arguments.

2. Support http, ftp, sftp streams for MpegServer.

3. Support nthread option for MpegDecoder, MpegEncoder, MpegClient and MpegServer.

4. Fix a bug caused by the constructor MpegServer().

5. Clean up all gcc warnings of the source codes.

6. Fix typos in docstrings.

V3.0.0 update report:

1. Fix a severe memory leaking bugs when using AVPacket.

2. Fix a bug caused by using MpegClient.terminate() when a video is closed by the server.

3. Support the MpegServer. This class is used for serving the online video streams.

4. Refactor the implementation of the loggings.

5. Add getParameter() and setParameter(configDict) APIs to MpegEncoder and MpegServer.

6. Move FFMpeg depedencies and the OutputStream class to the cmpc space.

7. Fix dependency issues and cpp standard issues.

8. Upgrade to FFMpeg 4.4 Version.

9. Add a quick script for fetching the FFMpeg dependencies.

V2.05 update report:

1. Fix a severe bug that causes the memory leak when using MpegClient.This bug also exists in MpegDecoder, but it seems that the bug would not cause memory leak in that case. (Although we have also fixed it now.)

2. Upgrade to FFMpeg 4.0 Version.

V2.01 update report:

1. Fix a bug that occurs when the first received frame may has a PTS larger than zero.

2. Enable the project produce the newest FFMpeg 3.4.2 version and use Python 3.6.4, numpy 1.14.

V2.0 update report:

1. Revise the bug of the encoder which may cause the stream duration is shorter than the real duration of the video in some not advanced media players.

2. Improve the structure of the code and remove some unnecessary codes.

3. Provide a complete version of client, which could demux the video stream from a server in any network protocol.

V1.8 update report:

1. Provide options (widthDst, heightDst) to let MpegDecoder could control the output size manually. To ensure the option is valid, we must use the method setParameter before FFmpegSetup. Now you could use this options to get a rescaled output directly:

     d = mpegCoder.MpegDecoder() # initialize
     d.setParameter(widthDst=400, heightDst=300) # noted that these options must be set before 'FFmpegSetup'! 
     d.FFmpegSetup(b'i.avi') # the original video size would not influence the output
     print(d) # examine the parameters. You could also get the original video size by 'getParameter'
     d.ExtractFrame(0, 100) # get 100 frames with 400x300

   In another example, the set optional parameters could be inherited by encoder, too:

     d.setParameter(widthDst=400, heightDst=300) # set optional parameters
     ...
     e.setParameter(decoder=d) # the width/height would inherit from widthDst/heightDst rather than original width/height of the decoder.

   Noted that we do not provide widthDst/heightDst in getParameter, because these 2 options are all set by users. There is no need to get them from the video metadata.

2. Optimize some realization of Decoder so that its efficiency could be improved.

V1.7-linux update report:

Thanks to God, we succeed in this work!

A new version is avaliable for Linux. To implement this tool, you need to install some libraries firstly:

• python3.5

• numpy 1.13

If you want, you could install ffmpeg on Linux: Here are some instructions

1. Check every pack which ffmpeg needs here: Dependency of FFmpeg

2. Use these steps to install ffmpeg instead of provided commands on the above site.

 $ git clone https://git.ffmpeg.org/ffmpeg.git
 $ cd ffmpeg
 $ ./configure --prefix=host --enable-gpl --enable-libx264 --enable-libx265 --enable-shared --disable-static --disable-doc
 $ make
 $ make install

V1.7 update report:

1. Realize the encoder totally.

2. Provide a global option dumpLevel to control the log shown in the screen.

3. Fix bugs in initialize functions.

V1.5 update report:

1. Provide an incomplete version of encoder, which could encode frames as a video stream that could not be played by player.

V1.4 update report:

1. Fix a severe bug of the decoder, which causes the memory collapsed if decoding a lot of frames.

V1.2 update report:

1. Use numpy array to replace the native pyList, which improves the speed significantly.

V1.0 update report:

1. Provide the decoder which could decode videos in arbitrary formats and arbitrary coding.