FFMPEG 12bit hevc encoding

[aniruddh]

can anyone tell me how to do 12 bit hevc encoding using ffmpeg

thanks in advance ^^

[Cornucopia]

8 and 10bit yes, but 12bit ffmpeg does not yet exist.

Scott

[El Heggunte]

libx265 should support 12-bit encoding — according to my memory banks, at least
The problem is, I don't remember the "recipe"

FWIW --- I've already sent yet another e-mail to the Strongeners =^.^=

And for the curious: yes, x265 can generate 12-bit streams as well --- confirmed by MediaInfo

The problem is, so far only TAppDecoder is able to decompress the damn thing

Coincidence or not, this afternoon I re-discovered that 12-bit HEVC sample that I had created...
and it played fine through the latest MPlayer (and LAV Filters too )
Too bad I already deleted it : -/

[LigH.de]

libx265 may exist with routines to encode in 8 bit, 10 bit, and 12 bit component resolution. The question is whether ffmpeg is able to use them and deliver video formats they would expect. It will probably depend on the technique how the three variants can be linked into ffmpeg (either statically as multilib, or dynamically by selecting either libx265_main.dll or libx265_main10.dll or libx265_main12.dll as external encoder libraries). A separate x265 CLI encoder can do that. But I don't know if ffmpeg supports either way.

So if ffmpeg does not support it internally, at least it can pipe Y4M video into an additional x265 encoder, which can switch the internal bitdepth with the -D parameter.

[pandy]

ffmpeg is somehow limited on h.265 encode - some flags are ignored - i would search other way o encode h.265 than ffmpeg.

[LigH.de]

In this case: Pipe Y4M from ffmpeg (or other sources) to x265.

[aniruddh]

can u tell me what command line to use to encode in 10bit
cuz i tried using profile one but it doesn't work

[LigH.de]

For a stand-alone x265 encoder, it would be --output-depth (-D). Try if ffmpeg supports that inside libx265opts; if not, pipe to x265.

[pandy]

can u tell me what command line to use to encode in 10bit
cuz i tried using profile one but it doesn't work

You may try to use x265 trough ffmpeg invoking something like:

ffmpeg -i "%1" -strict -1 -pix_fmt yuv420p10le -f yuv4mpegpipe - | x265 --y4m - --output-depth 10 --preset fast --crf 20 -o "%~n1.hevc"

Didn't try but should work, don't forget about 10bit x265 version.

[aniruddh]

okay thanks would try

[aniruddh]

can u tell me what command line to use to encode in 10bit
cuz i tried using profile one but it doesn't work

You may try to use x265 trough ffmpeg invoking something like:

ffmpeg -i "%1" -strict -1 -pix_fmt yuv420p10le -f yuv4mpegpipe - | x265 --y4m - --output-depth 10 --preset fast --crf 20 -o "%~n1.hevc"

Didn't try but should work, don't forget about 10bit x265 version.

well it worked now is there a way to add other code lines as well with this one
like -filter complex one
adding audio and other things

[LigH.de]

As much as you can stuff into an ffmpeg command line to prepare the video source for the x265 encoder will have an impact on the output of x265. But x265 will produce only a raw HEVC video stream, nothing else. Multiplexing that into a supporting container, together with other content, has to be applied after the video conversion finished, in a second step. That would require a batch / shell script / any kind of sequencing.

[pandy]

well it worked now is there a way to add other code lines as well with this one
like -filter complex one
adding audio and other things

I failed on this, it works partially so i would advise another pipe to container and later adding audio (another pipe?).
You must figure it by yourself - ffmpeg is a bit tricky under windows due syntax differences between linux and windows.
Bellow example works partially - i share it to show only basic principle how to do this kind of stuff - maybe it will be good to add another pipe stage with adding only audio.

@ffmpeg -thread_queue_size 512 -i %1 -an -pix_fmt yuv420p -f yuv4mpegpipe - | x265 --y4m -p %preset% --crf 20 -t %tune% --input - --output - | ffmpeg -fflags +genpts -thread_queue_size 512 -i - -i %1 -map 0:v:0 -map 1:a:0 -c:v copy -c:a aac -strict experimental -b:a 320k -af "aresample=resampler=soxr:osr=48000:dither_method=0" -f mpegts %mpegts% -shortest -y %1.ts

[Superfly Original]

Are there any moderators around?

[LigH.de]

Tools in a pipe chain often have the disadvantage to not knowing the whole input until it's complete and not being able to store optimal values into headers before reaching the end of the input. I would recommend to prefer specialists in building containers (e.g. MP4Box for *.mp4 or mkvmerge for *.mkv) over relying on ffmpeg working in a "filter" mode. There is a chance that ffmpeg may build a quite correct but somewhat incomplete container when used in a pipe chain.

(@ SO: If you may use the /!\ Report feature not only for reporting offending content, that may be the fastest way to summon one.)