ffmpeg Convert dv video to h.264 and change chroma subsampling

[wotdefcuk]

Hi,

I have a dv video with metadata as below.

General
Complete name : D:\Video.mov
Format : MPEG-4
Commercial name : DVCPRO HD
Format profile : QuickTime
Codec ID : qt
File size : 48.3 GiB
Duration : 59mn 16s
Overall bit rate mode : Constant
Overall bit rate : 117 Mbps
Encoded date : UTC 2012-05-10 19:16:00
Tagged date : UTC 2012-05-25 16:04:09
Writing library : Apple QuickTime 7.7
Media/UUID : D9F1C24C-5AB1-4690-BB19-CA591BBE3A95
com.apple.quicktime.player.movie.audio.m : (Binary)

Video
ID : 1
Format : DV
Commercial name : DVCPRO HD
Codec ID : dvh3
Duration : 59mn 16s
Bit rate mode : Constant
Bit rate : 97.8 Mbps
Encoded bit rate : 115 Mbps
Width : 1 259 pixels
Original width : 1 280 pixels
Height : 1 062 pixels
Original height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 10 bits
Scan type : Progressive
Original scan type : Interlaced
Original scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 2.440
Stream size : 40.5 GiB (84%)
Encoded stream size : 47.6 GiB (99%)
Language : English
Encoded date : UTC 2012-05-10 19:16:00
Tagged date : UTC 2012-05-25 16:04:09
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 2
Format : PCM
Format settings, Endianness : Little
Format settings, Sign : Signed
Codec ID : sowt
Duration : 59mn 16s
Bit rate mode : Constant
Bit rate : 1 536 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Stream size : 651 MiB (1%)
Language : English
Encoded date : UTC 2012-05-10 19:16:00

These are the requirements
1. Output to h.264 video
2. deinterlace (filter:v yadif)
3. convert subsampling to 420 from 422

Is it possible wth ffmpeg or any other video transcoding tool?

The script I used is

ffmpeg -nostats -i "Video.mov" -c:v libx264 -rpofile:v high422 -preset slow -s 1280x720 -x264opts 
crf=21:vbv-maxrate=16000:vbv-bufsize=16000:keyint=40:ref=3 -threads 0 -filter:v yadif -c:a libvo_aacenc -b:a 128k -ac 2 
-ar 44100 "Video.mp4"

[smrpix]

What errors did you get back when you tried it? And why are you using -nostats?

[wotdefcuk]

There were no errors. The video converted fine but I had to do it with profile high422 and my decoder does not support that profile. using other profiles gave me an error saying

x264 [error]: main profile doesn't support 4:2:2
[libx264 @ 031cf320] Error setting profile main.
[libx264 @ 031cf320] Possible profiles: baseline main high high10 high422 high444

And a fatal error saying

Error while opening encoder for output stream #0:0 - maybe incorrect parameters
such as bit_rate, rate, width or height

[poisondeathray]

-rpofile:v high422

is that supposed to be -profile:v ?

Why are you using high422 if the desired output is 420 ?

The old syntax for ffmpeg was -pix_fmt yuv420p . There are a bunch of changes recently to ffmpeg syntax, I don't know what it is currently.

(In x264CLI, --profile does nothing to the actual colorspace (it's just a label), you have to specify --input-csp i422 --output-csp i420 , but in ffmpeg, -pix_fmt used to be enough to use swscale to convert colorspaces)

[smrpix]

Try changing
-rpofile:v high422 (misspelled by the way) to -pix_fmt yuv422p

edit: oops, thought you were going the other way. poisondeathray's command should work.

[wotdefcuk]

Doing it now. It looks like it is working. I am not sure if the deinterlacing will work or not though but will let you know.

[wotdefcuk]

General
Complete name : D:\Video.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 1.72 GiB
Duration : 1h 0mn
Overall bit rate : 4 057 Kbps
Writing application : Lavf54.61.101

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1h 0mn
Bit rate : 3 921 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.142
Stream size : 1.66 GiB (97%)
Writing library : x264 core 129 r2245 bc13772
Encoding settings : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=40 / keyint_min=4 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=16000 / vbv_bufsize=16000 / crf_max=0.0 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Language : English

Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 1h 0mn
Duration_LastFrame : -11ms
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Delay relative to video : 67ms
Stream size : 55.5 MiB (3%)
Language : English


Great it was able to convert chroma subsampling from 4:2:2 to 4:2:0 but the profile is high. Is there a way to control the profile too?

[poisondeathray]

Is there a way to control the profile too?

-profile

https://sites.google.com/site/linuxencoding/x264-ffmpeg-mapping