transcode2H265

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FFmpeg wrapper for unattended video transcoding to H265 codec, in MKV containers.

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// repository documentation

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# transcode2H265
FFmpeg wrapper for unattended video transcoding to H265 codec, in MKV containers.

## Video
Video stream is transcoded to H265 using libx265 encoder. Video is encoded in 10 bits to preserve HDR, or to improve SDR video overall quality.

## Audio
All audio streams are either transcode to AAC, using native FFmpeg aac encoder, or copied as they are, depending on the `--audio-codec` option. Language, and other audio metadata is preserved.

## Subtitle
All internal subtitles are copied, preserving language and any other metadata. External subtitles are ignored.

## Skipping files
By default if the output file exist the video file is skipped.

User may specify video codecs to be ignored (as named by ffmpeg, i.e.: hvec, h264 and such). Files matching these codecs will not be transcoded.

## Installation
As a python script you can just run the transcode2H265.py file, or put a symbolic link in any directory of your PATH (e.g. /usr/local/bin)
The script needs `ffmpeg` installed and in your PATH to work, and if it can not find them in your system it will complain and exit.
The script depends on the following Python libraries:
* sys
* os
* time
* random
* subprocess
* string
* argparse

## Default use
Just do:
`transcode2H265.py video_file[s]`

### Options
```
  -h, --help            show this help message and exit
  -p, --preset {ultrafast,superfast,veryfast,faster,fast,medium,slow,slower,veryslow}
                        X265 preset [default: slow].
  -q, --crf CRF         CRF value [default: 26]. Determines the output video quality. Smaller values gives better qualities and bigger file sizes, bigger values
                        result in less quality and smaller file sizes. Default value results in a nice quality/size ratio. CRF values should be in the range of 0 to
                        51.
  -a, --audio-codec {aac,copy}
                        Output audio codec. You may transcode all input audio streams into aac (preserving their channels), or copy the input streams as they are
                        [default: aac].
  -b, --aac_audio_bitrate_per_channel AAC_AUDIO_BITRATE_PER_CHANNEL
                        AAC audio bitrate per channel (in kb/s) [default: 96]. Ignored if audio codec not aac. Maximum audio bitrate is determined by the audio
                        stream with more channels.
  -x, --filename-postfix FILENAME_POSTFIX
                        Postfix to be added to newly created H.265 video files [default: _h265].
  -t, --threads THREADS
                        Indicates the number of processor cores the script will use. 0 indicates to use as many as possible, or current libx265 library defaults
                        [default: 0]. ffmpeg may or may not respect this.
  -s, --skip-codecs SKIP_CODECS
                        Comma-separated list of video codecs to skip (e.g., hevc,h264). Files matching these codecs will not be transcoded.
  -v, --version         Show program's version number and exit.

```

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