[FFmpeg-user] Chroma problem converting mp4 to prores

[Dave]

Hi guys,

I am having a issue where all the clips that I convert have a chroma
problem.  The red is saturated on all clips and there are red horizontal
lines in the chroma.

$ ffmpeg -y -i 5079162_NHL\ Marleau.mp4 -acodec pcm_s16le -vcodec prores_ks
-profile:v 1 -copytb -1 -vf yadif=1 -qscale:v 10 mp4-yadif1-q10.mov
I thought this might be the chroma bug but I have experimented with a
couple of different options replacing yadif=1 with the following:

-vf scale=out_color_matrix=bt709
-pix_fmt yuv422p10le
-vf colormatrix=bt601:bt709
-vf yadif

The yadif=1 option provides the closest results and specifying multiple
options seems to make it worse not better.  The problem is more obvious on
a broadcast monitor.

We are also having a problem where the converted clips are 1 frame shorter
than the original, missing a black frame at the start of the clip.

Here are the details of the clip I am trying to convert:

$ ffprobe -v error -show_format -show_streams 5079162_NHL\ Marleau.mp4
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=Main
codec_type=video
codec_time_base=1/50
codec_tag_string=avc1
codec_tag=0x31637661
width=1920
height=1080
coded_width=1920
coded_height=1080
has_b_frames=1
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuv420p
level=41
color_range=tv
color_space=unknown
color_transfer=unknown
color_primaries=unknown
chroma_location=left
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=25/1
avg_frame_rate=25/1
time_base=1/50000
start_pts=0
start_time=0.000000
duration_ts=2354000
duration=47.080000
bit_rate=9081205
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=1177
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:creation_time=2017-02-03T23:55:00.000000Z
TAG:language=eng
TAG:handler_name=Alias Data Handler
TAG:encoder=AVC Coding
[/STREAM]
[STREAM]
index=1
codec_name=aac
codec_long_name=AAC (Advanced Audio Coding)
profile=LC
codec_type=audio
codec_time_base=1/48000
codec_tag_string=mp4a
codec_tag=0x6134706d
sample_fmt=fltp
sample_rate=48000
channels=2
channel_layout=stereo
bits_per_sample=0
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/48000
start_pts=0
start_time=0.000000
duration_ts=2259840
duration=47.080000
bit_rate=253262
max_bit_rate=283875
bits_per_raw_sample=N/A
nb_frames=2210
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:creation_time=2017-02-03T23:55:01.000000Z
TAG:language=eng
TAG:handler_name=Alias Data Handler
[/STREAM]
[FORMAT]
filename=5079162_NHL Marleau.mp4
nb_streams=2
nb_programs=0
format_name=mov,mp4,m4a,3gp,3g2,mj2
format_long_name=QuickTime / MOV
start_time=0.000000
duration=47.146600
size=54956371
bit_rate=9325189
probe_score=100
TAG:major_brand=mp42
TAG:minor_version=0
TAG:compatible_brands=mp42mp41
TAG:creation_time=2017-02-03T23:54:57.000000Z
[/FORMAT]