Does ffmpeg actually support TrueHD or/and MLP encoding?

filler56789 · 13th January 2019, 19:33

According to ffmpeg -codecs, yes:

Code:

DEA..S truehd     TrueHD
DEA..S mlp        MLP (Meridian Lossless Packing)

but whenever I try to encode a "normal" stereo & 16-bit & 44.1 kHz .WAV file to MLP or TrueHD,
all I get is a useless "Conversion failed!"

¿Am I missing something?

microchip8 · 13th January 2019, 19:47

did you set -strict -2 ?

filler56789 · 13th January 2019, 20:32

Quote:

Originally Posted by froggy1

did you set -strict -2 ?

Nope, I hadn't included that switch

Now the program works as expected.

Too bad the ffmpeg team loves to complicate everything :-/

microchip8 · 13th January 2019, 20:33

that's because these are still considered experimental...

filler56789 · 15th January 2019, 14:33

Yes, regarding the final filesize, the experimental lossless audio encoders haven't been optimized (yet - ?)

Just as an example, a 4-minute Audio-CD track was converted to a 31-megabyte MLP stream through the certified commercial encoder, but resulted in a 38-megabyte file when I used ffmpeg.

microchip8 · 15th January 2019, 15:10

did you set the bitrate for TrueHD/MLP encoding?

-b:a <value>

nevcairiel · 15th January 2019, 15:50

Quote:

Originally Posted by froggy1

did you set the bitrate for TrueHD/MLP encoding?

-b:a <value>

Bitrate for lossless codecs makes no sense. It has to use as many bits as it needs to for the full lossless signal.

microchip8 · 15th January 2019, 17:21

Quote:

Originally Posted by nevcairiel

Bitrate for lossless codecs makes no sense. It has to use as many bits as it needs to for the full lossless signal.

Thanks! brain fart

13th January 2019, 19:33	#1 \| Link
filler56789 SuperVirus Join Date: Jun 2012 Location: Antarctic Japan Posts: 1,351	Does ffmpeg actually support TrueHD or/and MLP encoding? According to ffmpeg -codecs, yes: Code: DEA..S truehd TrueHD DEA..S mlp MLP (Meridian Lossless Packing) but whenever I try to encode a "normal" stereo & 16-bit & 44.1 kHz .WAV file to MLP or TrueHD, all I get is a useless "Conversion failed!" ¿Am I missing something?

13th January 2019, 19:47	#2 \| Link
microchip8 ffx264/ffhevc author Join Date: May 2007 Location: /dev/video0 Posts: 1,844	did you set -strict -2 ? __________________ ffx264 \|\| ffhevc \|\| ffxvid \|\| microenc

13th January 2019, 20:33	#4 \| Link
microchip8 ffx264/ffhevc author Join Date: May 2007 Location: /dev/video0 Posts: 1,844	that's because these are still considered experimental... __________________ ffx264 \|\| ffhevc \|\| ffxvid \|\| microenc

15th January 2019, 15:10	#6 \| Link
microchip8 ffx264/ffhevc author Join Date: May 2007 Location: /dev/video0 Posts: 1,844	did you set the bitrate for TrueHD/MLP encoding? -b:a <value> __________________ ffx264 \|\| ffhevc \|\| ffxvid \|\| microenc

15th January 2019, 14:33	#5 \| Link
filler56789 SuperVirus Join Date: Jun 2012 Location: Antarctic Japan Posts: 1,351	Yes, regarding the final filesize, the experimental lossless audio encoders haven't been optimized (yet - ?) Just as an example, a 4-minute Audio-CD track was converted to a 31-megabyte MLP stream through the certified commercial encoder, but resulted in a 38-megabyte file when I used ffmpeg.