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biim

An example for Apple Low Lantency HLS Packager and Origin

Feature

  • MPEG-TS Demuxing and Apple LL-HLS Packaging in pure Python3 (using asyncio)
  • Packaging MPEG-TS stream to HLS media segment (MPEG-TS or fmp4)
    • main.py: Packaging MPEG-TS stream to MPEG-TS segment (for H.264/AVC, AAC, ID3)
      • Support TIMED-ID3 Metadata PassThrough
    • fmp4.py: Packaging MPEG-TS stream to fmp4 segment (for H.265/HEVC, AAC, ID3)
      • Support TIMED-ID3 Metadata to EMSG-ID3 Conversion
  • Support LL-HLS Feature (1s Latency with HTTP/2, 2s Latency with HTTP/1.1)
    • Support Blocking Request
    • Support EXT-X-PRELOAD-HINT with Chunked Transfer
    • NOTE: HTTP/2 is currently not Supported. If use with HTTP/2, please proxing HTTP/2 to HTTP/1.1.
  • In Memory (On the fly) LL-HLS Serving
    • Not use disk space for LL-HLS Delivery

Dependency

  • aiohttp

Usege

Ingest MPEG-TS Stream to biim's STDIN!

# mpegts (for H.264)
ffmpeg xxx -f mpegts - | ./main.py --port 8080
# fmp4 (for H.264/H.265)
ffmpeg xxx -f mpegts - | ./fmp4.py --port 8080

# watch http://localhost:8080/playlist.m3u8

Options

  • -i, --input,
    • Specify input source.
    • if not Specified, use STDIN.
    • if Specified file, throttled for pseudo live serving.
    • DEFAULT: STDIN
  • -t, --target_duration
    • Specify minmum TARGETDURATION for LL-HLS
    • DEFAULT: 1
  • -p, --part_duration
    • Specify PART-TARGET for LL-HLS
    • DEFAULT: 0.1
  • -w, --window_size
    • Specify Live Window for LL-HLS
    • if Not Specifed, window size is Infinify, for EVENT(DVR).
    • DEFAULT: Infinity (None)
  • --port
    • Specify Serving PORT for LL-HLS
    • DEFAULT: 8080

Example (Generate Test Stream H.265(libx265)/AAC With Timestamp)

ffmpeg -re \
  -f lavfi -i testsrc=700x180:r=30000/1001 \
  -f lavfi -i sine=frequency=1000 \
  -vf "settb=AVTB,setpts='trunc(PTS/1K)*1K+st(1,trunc(RTCTIME/1K))-1K*trunc(ld(1)/1K)',drawtext=fontsize=60:fontcolor=black:text='%{localtime}.%{eif\:1M*t-1K*trunc(t*1K)\:d\:3}'" \
  -c:v libx265 -tune zerolatency -preset ultrafast -r 30 -g 15 -pix_fmt yuv420p \
  -c:a aac -ac 1 -ar 48000 \
  -f mpegts - | ./fmp4.py -t 1 -p 0.15 -w 10 --port 8080
# watch http://localhost:8080/playlist.m3u8

Special Thanks

  • xtne6f: C++ ReImplementation (tsmemseg) and Report ISOBMFF related misc bugs.
  • tsukumi: Very helpful advice and implementation to biim's Type Definition.