[Gnu tools] find quirks

Intended effect

List all directories recursively called "ready" or "data" .

Failing command

find . -type d -a \(-name ready -o -name data\)

find: paths must precede expression: `(-name' 

Cause

find is somewhat picky with respect to parenthesis. It is not enough to escape them.

Solution

Make sure, whitespace is around them.

find . -type d -a \( -name ready -o -name data \)

[Video] for Bluray-Player Samsung

Supported formats

HT-J4500

Tested

Result	Container format	Video Codec	Audio Codec	Remarks
OK	raw	raw	raw	I noticed that at least some DVDs can be copied to a NAS disk which in turn is connected and read from the player just as they appear on the file system browser under the Windows 10 explorer/FileZilla. I assume it does not matter whether this is done with the via of the local file system as I did or directly or whether it is important to do it under Windows. It was an accidental discovery. Unfortunately and obviously, copy protected media deny such treatment - at least under Windows 10.
OK	Matroska (.mkv)	Advance Video Coding (AVC/h.264/MPEG-4 Part 10)	MPEG 3 (MP3)
OK	MPEG 4 (.3gp / .3gpp)	MPEG 4 (Advanced Simple BVOP)	Advanced Audio Coding (AAC)
OK	QTFF Quicktime file format (.mov)	Advance Video Coding (AVC/h.264/MPEG-4 Part 10)	Pulse Code Modulation (PCM)
OK	MPEG PS (.vob)	MPEG 2 (Main BVOP)	MPEG 2 (MP2)	The file suffix of the container format seems to be wrong
NOK	Matroska (.mkv)	MPEG 2 (MP2)	Pulse Code Modulation (PCM)	Unsupported format error (it is assumed that mkv is meant even tough specs tells it was (possibly in combination with the video codec)
NOK	Matroska (.mkv)	MPEG 2 (MP2)	Dolby Digital / AC-3	Unsupported format error (it is assumed that mkv is meant even tough specs tells it was (possibly in combination with the video codec)
Result	Container format	Video Codec	Audio Codec	Remarks

avi

• Video
  
  • DivX 3.11/4/5/6
  • mp4 v3
  • H.264 BP/MP/HP

•  Audio
• mp3
• WMA
• PCM
• Dolby Digital (= AC-3)
• DTS

mkv

• Video
• VC-1 AP
• DivX 5/6
• H.264 BP/MP/HP
• Audio
• mp3
• Dolby Digital (= AC-3)
• DTS
• Problems
• A conversion from H.264/opus to H.264/mp3 with copy or omitting -vcodec made first player complain about an unsupported format.

wmv (9)

• Video
• VC-1 AP/SM
• Audio
• WMA

mp4

• Video
• mp4v
• H.264 BP/MP/HP
• Audio
• AAC

BD-F5100

avi

• Video
  
  • DivX 3.11/4.x/5.x/6.1
  • mp4 v3
  • H.264 BP/MP/HP

•  Audio
• mp3
• WMA
• PCM
• Dolby Digital (= AC-3)
• DTS

mkv

• Video
• VC-1 AP
• DivX 5.1/6.0
• H.264 BP/MP/HP
• Audio
• mp3
• Dolby Digital (= AC-3)
• DTS

wmv (9)

• Video
• VC-1 AP/SM
• Audio
• WMA

mp4

• Video
• mp4v
• H.264 BP/MP/HP
• Audio
• AAC

Conversion with ffmpeg (3.4.4-0ubuntu0.18.04.1)

To convert audio/video use switches -acodec and -vcodec respectively. The value following the switch specifies the target format. If you do not want to convert one of the streams, you can omit the switch entirely (it seems to get very slow though) - or you use copy.
However, I had some troubles with my tests. It was a download from youtube where the video was mp4 stream and the audio webm (opus). youtube-dl complained "WARNING: Requested formats are incompatible for merge and will be merged into mkv." So I ended up with a Matroska container. This probably is because as of time of writing "opus in MP4 support is experimental, add '-strict -2' if you want to use it." as ffmpeg told me.

• Change audio to mp3
  

  ffmpeg -i some_file.mkv -acodec mp3 -vcodec copy some_file_of_other_container.mp4

• Change video to H.265
  

  ffmpeg -i some_file.mkv -vcodec hevc some_file_h265.mkv