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I'm trying to switch my encoding setup from Mac to Windows. As part of that, I'm trying to get FFmpeg working as my ProRes encoder.
I'm converting from 10-bit uncompressed to ProRes 422 HQ. When I do, colors are noticeably darker, by comparison to the original uncompressed, and a ProRes from Adobe Media Encoder.
I'm using
./ffmpeg -i testfile.mov -c:v prores_ks -profile:v 3 -pix_fmt yuv422p10le -c:a copy prores422_ks4.mov
I've tried the ProRes and Prores_KS codec, with the same result. I ran MediaInfo on the files an got the following:
Adobe Media Encoder (correct color)
Format : MPEG-4 Format profile : QuickTime Codec ID : qt 2005.03 (qt ) File size : 208 MiB Duration : 13 s 13 ms Overall bit rate mode : Variable Overall bit rate : 134 Mb/s Encoded date : UTC 2018-03-14 22:08:26 Tagged date : UTC 2018-03-14 22:09:38 Writing library : Apple QuickTime TIM : 00:59:53:00 TSC : 24000 TSZ : 1001 Video ID : 1 Format : ProRes Format version : Version 0 Format profile : 422 HQ Codec ID : apch Duration : 13 s 13 ms Bit rate mode : Variable Bit rate : 132 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:2 Scan type : Progressive Bits/(Pixel*Frame) : 2.654 Stream size : 205 MiB (98%) Writing library : Apple Language : English Encoded date : UTC 2018-03-14 22:08:26 Tagged date : UTC 2018-03-14 22:08:26 Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709
FFmpeg (darker colors)
Format : MPEG-4 Format profile : QuickTime Codec ID : qt 0000.02 (qt ) File size : 195 MiB Duration : 13 s 55 ms Overall bit rate mode : Variable Overall bit rate : 125 Mb/s Writing application : Lavf57.83.100 Video ID : 1 Format : ProRes Format version : Version 0 Format profile : 422 HQ Codec ID : apch Duration : 13 s 55 ms Bit rate mode : Variable Bit rate : 124 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:2 Scan type : Progressive Bits/(Pixel*Frame) : 2.485 Stream size : 192 MiB (99%) Writing library : Lavc Language : English Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709
Original Footage
Format : MPEG-4 Format profile : QuickTime Codec ID : qt 2005.03 (qt ) File size : 2.42 GiB Duration : 13 s 55 ms Overall bit rate : 1 592 Mb/s Encoded date : UTC 2018-03-14 20:32:39 Tagged date : UTC 2018-03-14 20:32:39 Video ID : 1 Format : RGB Codec ID : r210 Codec ID/Hint : Blackmagic Design Duration : 13 s 55 ms Bit rate mode : Constant Bit rate : 1 591 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Scan type : Progressive Bits/(Pixel*Frame) : 32.000 Stream size : 2.42 GiB (100%) Language : English Encoded date : UTC 2018-03-14 20:32:39 Tagged date : UTC 2018-03-14 20:32:39 Color primaries : BT.709 Transfer characteristics : BT.709 Matrix coefficients : BT.709
Here is the output from FFMpeg
Guessed Channel Layout for Input Stream #0.2 : stereo
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'testfile.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2018-03-14T20:32:39.000000Z
Duration: 00:00:13.05, start: 0.000000, bitrate: 1592473 kb/s
Stream #0:0(eng): Video: r210 (r210 / 0x30313272), rgb48le(10 bpc, bt709, progressive), 1920x1080, 1590933 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
Metadata:
creation_time : 2018-03-14T20:32:39.000000Z
handler_name : Linux Alias Data Handler
encoder : 10 bit packed RGB (r210)
timecode : 00:59:53:00
Stream #0:1(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
Metadata:
rotate : 0
creation_time : 2018-03-14T20:32:39.000000Z
handler_name : Libquicktime Time Code Media Handler
reel_name : untitled
timecode : 00:59:53:00
Stream #0:2(eng): Audio: pcm_s16be (lpcm / 0x6D63706C), 48000 Hz, stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2018-03-14T20:32:39.000000Z
handler_name : Linux Alias Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (r210 (native) -> prores (prores_ks))
Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
Output #0, mov, to 'prores422_ks9.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
encoder : Lavf57.83.100
Stream #0:0(eng): Video: prores (prores_ks) (apch / 0x68637061), yuv422p10le, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 23.98 fps, 24k tbn, 23.98 tbc (default)
Metadata:
creation_time : 2018-03-14T20:32:39.000000Z
handler_name : Linux Alias Data Handler
timecode : 00:59:53:00
encoder : Lavc57.107.100 prores_ks
Stream #0:1(eng): Audio: pcm_s16be (lpcm / 0x6D63706C), 48000 Hz, stereo, s16, 1536 kb/s (default)
Metadata:
creation_time : 2018-03-14T20:32:39.000000Z
handler_name : Linux Alias Data Handler
Here are some example images of what the change looks like. I can't post full frames or anything identifying of the content, but here are some color swatches.
Note: I trimmed a black frame or two off the end in Media Encoder
I'm a noob at FFmpeg, so any help would be greatly appreciated! I assume I'm missing something obvious.
Muindor
Posted 2018-03-19T23:56:30.793
Reputation: 21
is it only getting darker or is it getting "less contrasty" all together? could well be that FFmpeg is interpreting your source material as 0-255, when it actually already is 16-240 (I know it's 10bit, but you get the idea...). also, the ffmpeg banner would help - and knowing something about the source. – flolilo – 2018-03-20T00:24:30.200
@flolilolilo I just updated the post with pictures, MediaInfo of the uncompressed source and FFmpeg readout. Thank you so much! – Muindor – 2018-03-20T19:51:24.093
Uh...can you deliver something more..contrasty? ideally, it would be some color-bars, so we can see if it affects the whole spectrum of levels (vulgo: everything gets darker) or if it just compresses the top and bottom parts of the spectrum.
– flolilo – 2018-03-20T20:25:20.160still, from what I see, I would bet it comes down to the conversion from RGB48 (as ffmpeg calls it) to YUV422. I will check if I can find anything on that topic... – flolilo – 2018-03-20T20:26:30.223
@flolilolilo I just added some color bars. Thanks so much for the help. I'll keep searching too! – Muindor – 2018-03-21T00:16:07.573
as you can see, it only darkens the lighter colors - black even gets lighter. therefore, my guess that it tries to make your video TV-safe (16-235 instead of 0-255 - that's 8 bit, I know ;-) ). I have to go to sleep now, but perhaps this ffmpeg trac "Impossible to transcode full range RGB videos" might be of use. Will look into more of it tomorrow ;-).
– flolilo – 2018-03-21T00:48:41.147@flolilolilo Now that I know what to search for, I see it is a common issue. I looked into that post and could'nt find a solution, but I'll keep searching :D Thank you! – Muindor – 2018-03-21T18:26:31.027
Was a solution to this problem ever found? – jippyjoe4 – 2019-07-04T19:21:02.133