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  • FFmpeg recording audio from several sources

    4 avril 2017, par Valery Shevchuk

    everyone.
    I’m trying to use FFmpeg to record video and 3 audio sources and use it to generate 3 different video files - each file should contain the same video stream but the different audio stream. The problem is that I got audio sync issues. The first audio stream is synced perfectly, but the second one has 1 sec lag, and the third one has like 2 sec lag.

    I’ve made a few tests so far and it seems that root cause of the issue is initialization time of video/audio devices. So, one device is already recording something but the second is still being opened and so on. I’ve tried to change input devices order and after that audio streams still have the same issue BUT if before 2nd and 3rd audio streams were some time ahead of video, after reordering they became to lag after the audio (audio for the same event appears with some delay). So this test confirms my version about device initialization times.

    But the question still, why the first audio stream is synchronized properly, while other 2 are not. and also, how could I overcome this issues ? Any workarounds and ideas are highly appreciated.

    Here is FFmpeg command I’m using and it’s output.

    ffmpeg.exe -f dshow -video_size 1920x1080 -i video="Logitech HD Webcam
    C615" -f dshow -i audio="Microphone (HD Webcam C615)" -f dshow -i
    audio="Microphone Array (Realtek High Definition Audio)"
    -filter_complex "[1:a]volume=1[a1] ;[2:a]volume=1[a2]" -vf scale=h=1080:force_original_aspect_ratio=decrease -vcodec libx264
    -pix_fmt yuv420p -crf 23 -preset ultrafast -acodec aac -vbr 5 -threads 0 -map v:0 -map [a1] -map [a2] -f tee
    "[select=\’v,a:0\’]C :/Users/vshevchu/Desktop/123/111/111_jjj1.avi|
    [select=\’v,a:1\’]C :/Users/vshevchu/Desktop/123/111/111_jjj2.avi"

    OUTPUT

    PS. Actually, the issue is exactly the same when I’m not using "tee" muxer but writing all the audio streams to one container. So, "tee" isn’t a suspect.

  • Solved : ffmpeg : How can a MOV with transparent background be created ?

    25 mars 2017, par Mat

    (Remark : the error sat, as usual, between back-rest and keyboard. Thanks, Mulvya !)

    Hi, specialists !

    I’m trying - with no success at all - to convert the green pixels of a background into transparent ones and output the result as clip with ffmpeg. N.b. I do not want to lay the clip over anything ; I’m not having a problem with that. What I want is a clip with transparent background for the OpenShot video editor (the chromakey filter of which doesn’t work satisfyingly).

    What I have tried (amongst a felt 1 zillion other things over the last 15 hrs.) was

    ffmpeg.exe -i in.mov -vf chromakey=0x008001:0.115:0.0 -c:v qtrle out.mov

    but the pixels simply would not be transparent. Seemingly, nothing happens. I reckon the filter is ok, because it works fine in a complex chain (overlaying a background image).

    The output of ffprompt -show_stream -show_format of out.mov is as follows :

    [STREAM]
    
index=0
    
codec_name=qtrle
    
codec_long_name=QuickTime Animation (RLE) video
    
profile=unknown
    
codec_type=video
    
codec_time_base=1/30
    
codec_tag_string=rle
    
codec_tag=0x20656c72
    
width=1920
    
height=1080
    
coded_width=1920
    
coded_height=1080
    
has_b_frames=0
    
sample_aspect_ratio=1:1
    
display_aspect_ratio=16:9
    
pix_fmt=bgra
    
level=-99
    
color_range=N/A
    
color_space=unknown
    
color_transfer=unknown
    
color_primaries=unknown
    
chroma_location=unspecified
    
field_order=progressive
    
timecode=N/A
    
refs=1
    
id=N/A
    
r_frame_rate=30/1
    
avg_frame_rate=30/1
    
time_base=1/15360
    
start_pts=0
    
start_time=0.000000
    
duration_ts=54789
    
duration=3.566992
    
bit_rate=822383192
    
max_bit_rate=N/A
    
bits_per_raw_sample=N/A
    
nb_frames=107
    
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:language=eng
    
TAG:handler_name=DataHandler
    
TAG:encoder=Lavc57.64.101 qtrle
    
[/STREAM]
    
[STREAM]
    
index=1
    
codec_name=aac
    
codec_long_name=AAC (Advanced Audio Coding)
    
profile=LC
    
codec_type=audio
    
codec_time_base=1/44100
    
codec_tag_string=mp4a
    
codec_tag=0x6134706d
    
sample_fmt=fltp
    
sample_rate=44100
    
channels=2
    
channel_layout=stereo
    
bits_per_sample=0
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/44100
    
start_pts=926
    
start_time=0.020998
    
duration_ts=157481
    
duration=3.570998
    
bit_rate=132103
    
max_bit_rate=132103
    
bits_per_raw_sample=N/A
    
nb_frames=153
    
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:language=eng
    
TAG:handler_name=DataHandler
    
[/STREAM]
    
[FORMAT]
    
filename=out.mov
    
nb_streams=2
    
nb_programs=0
    
format_name=mov,mp4,m4a,3gp,3g2,mj2
    
format_long_name=QuickTime / MOV
    
start_time=0.000000
    
duration=3.567000
    
size=366708874
    
bit_rate=822447712
    
probe_score=100
    
TAG:major_brand=qt
    
TAG:minor_version=512
    
TAG:compatible_brands=qt
    
TAG:encoder=Lavf57.56.101
    
[/FORMAT]

    I have a "sample" clip which shows the behaviour I want, with the following stream and information :

    [STREAM]
    
index=0
    
codec_name=qtrle
    
codec_long_name=QuickTime Animation (RLE) video
    
profile=unknown
    
codec_type=video
    
codec_time_base=1/24
    
codec_tag_string=rle
    
codec_tag=0x20656c72
    
width=1920
    
height=1080
    
coded_width=1920
    
coded_height=1080
    
has_b_frames=0
    
sample_aspect_ratio=0:1
    
display_aspect_ratio=0:1
    
pix_fmt=bgra
    
level=-99
    
color_range=N/A
    
color_space=unknown
    
color_transfer=unknown
    
color_primaries=unknown
    
chroma_location=unspecified
    
field_order=progressive
    
timecode=N/A
    
refs=1
    
id=N/A
    
r_frame_rate=24/1
    
avg_frame_rate=24/1
    
time_base=1/12288
    
start_pts=0
    
start_time=0.000000
    
duration_ts=74760
    
duration=6.083984
    
bit_rate=49226848
    
max_bit_rate=N/A
    
bits_per_raw_sample=N/A
    
nb_frames=146
    
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:language=eng
    
TAG:handler_name=DataHandler
    
TAG:encoder=Lavc57.24.102 qtrle
    
[/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=293856
    
duration=6.122000
    
bit_rate=53537
    
max_bit_rate=128000
    
bits_per_raw_sample=N/A
    
nb_frames=288
    
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:language=eng
    
TAG:handler_name=DataHandler
    
[/STREAM]
    
[FORMAT]
    
filename=templateOK.mov
    
nb_streams=2
    
nb_programs=0
    
format_name=mov,mp4,m4a,3gp,3g2,mj2
    
format_long_name=QuickTime / MOV
    
start_time=0.000000
    
duration=6.144000
    
size=37478506
    
bit_rate=48800138
    
probe_score=100
    
TAG:major_brand=qt
    
TAG:minor_version=512
    
TAG:compatible_brands=qt
    
TAG:encoder=Lavf57.25.100
    
[/FORMAT]

    and I simply am not able to spot the relevant difference.

    Any suggestions would be highly appreciated !

    Cheers,

    Mat

    The input, output and the working template can be found here.

    (The security issue you might see when clicking the link comes from the server certificate being self-signed. You can accept a temporal exception. Btw : The ridiculous file size of the output file will be the next nut to crack. Probably s.t. about compression.)

  • ffmpeg : How can a MOV with transparent background be created ?

    25 mars 2017, par Mat

    I’m trying - with no success at all - to convert the green pixels of a background into transparent ones and output the result as clip with ffmpeg. N.b. I do not want to lay the clip over anything ; I’m not having a problem with that. What I want is a clip with transparent background for the OpenShot video editor (the chromakey filter of which doesn’t work satisfyingly).

    What I have tried (amongst 1 zillion other things over the last 15 hrs.) was

    ffmpeg.exe -i in.mov -vf chromakey=0x008001:0.115:0.0 -c:v qtrle out.mov

    but the pixels simply would not be transparent. Seemingly, nothing happens. I reckon the filter is ok, because it works fine in a complex chain (overlaying a background image).

    The output of ffprompt -show_stream -show_format of out.mov is as follows :

    [STREAM]
    
index=0
    
codec_name=qtrle
    
codec_long_name=QuickTime Animation (RLE) video
    
profile=unknown
    
codec_type=video
    
codec_time_base=1/30
    
codec_tag_string=rle
    
codec_tag=0x20656c72
    
width=1920
    
height=1080
    
coded_width=1920
    
coded_height=1080
    
has_b_frames=0
    
sample_aspect_ratio=1:1
    
display_aspect_ratio=16:9
    
pix_fmt=bgra
    
level=-99
    
color_range=N/A
    
color_space=unknown
    
color_transfer=unknown
    
color_primaries=unknown
    
chroma_location=unspecified
    
field_order=progressive
    
timecode=N/A
    
refs=1
    
id=N/A
    
r_frame_rate=30/1
    
avg_frame_rate=30/1
    
time_base=1/15360
    
start_pts=0
    
start_time=0.000000
    
duration_ts=54789
    
duration=3.566992
    
bit_rate=822383192
    
max_bit_rate=N/A
    
bits_per_raw_sample=N/A
    
nb_frames=107
    
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:language=eng
    
TAG:handler_name=DataHandler
    
TAG:encoder=Lavc57.64.101 qtrle
    
[/STREAM]
    
[STREAM]
    
index=1
    
codec_name=aac
    
codec_long_name=AAC (Advanced Audio Coding)
    
profile=LC
    
codec_type=audio
    
codec_time_base=1/44100
    
codec_tag_string=mp4a
    
codec_tag=0x6134706d
    
sample_fmt=fltp
    
sample_rate=44100
    
channels=2
    
channel_layout=stereo
    
bits_per_sample=0
    
id=N/A
    
r_frame_rate=0/0
    
avg_frame_rate=0/0
    
time_base=1/44100
    
start_pts=926
    
start_time=0.020998
    
duration_ts=157481
    
duration=3.570998
    
bit_rate=132103
    
max_bit_rate=132103
    
bits_per_raw_sample=N/A
    
nb_frames=153
    
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:language=eng
    
TAG:handler_name=DataHandler
    
[/STREAM]
    
[FORMAT]
    
filename=out.mov
    
nb_streams=2
    
nb_programs=0
    
format_name=mov,mp4,m4a,3gp,3g2,mj2
    
format_long_name=QuickTime / MOV
    
start_time=0.000000
    
duration=3.567000
    
size=366708874
    
bit_rate=822447712
    
probe_score=100
    
TAG:major_brand=qt
    
TAG:minor_version=512
    
TAG:compatible_brands=qt
    
TAG:encoder=Lavf57.56.101
    
[/FORMAT]

    I have a "sample" clip which shows the behaviour I want, with the following stream and information :

    [STREAM]
    
index=0
    
codec_name=qtrle
    
codec_long_name=QuickTime Animation (RLE) video
    
profile=unknown
    
codec_type=video
    
codec_time_base=1/24
    
codec_tag_string=rle
    
codec_tag=0x20656c72
    
width=1920
    
height=1080
    
coded_width=1920
    
coded_height=1080
    
has_b_frames=0
    
sample_aspect_ratio=0:1
    
display_aspect_ratio=0:1
    
pix_fmt=bgra
    
level=-99
    
color_range=N/A
    
color_space=unknown
    
color_transfer=unknown
    
color_primaries=unknown
    
chroma_location=unspecified
    
field_order=progressive
    
timecode=N/A
    
refs=1
    
id=N/A
    
r_frame_rate=24/1
    
avg_frame_rate=24/1
    
time_base=1/12288
    
start_pts=0
    
start_time=0.000000
    
duration_ts=74760
    
duration=6.083984
    
bit_rate=49226848
    
max_bit_rate=N/A
    
bits_per_raw_sample=N/A
    
nb_frames=146
    
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:language=eng
    
TAG:handler_name=DataHandler
    
TAG:encoder=Lavc57.24.102 qtrle
    
[/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=293856
    
duration=6.122000
    
bit_rate=53537
    
max_bit_rate=128000
    
bits_per_raw_sample=N/A
    
nb_frames=288
    
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:language=eng
    
TAG:handler_name=DataHandler
    
[/STREAM]
    
[FORMAT]
    
filename=templateOK.mov
    
nb_streams=2
    
nb_programs=0
    
format_name=mov,mp4,m4a,3gp,3g2,mj2
    
format_long_name=QuickTime / MOV
    
start_time=0.000000
    
duration=6.144000
    
size=37478506
    
bit_rate=48800138
    
probe_score=100
    
TAG:major_brand=qt
    
TAG:minor_version=512
    
TAG:compatible_brands=qt
    
TAG:encoder=Lavf57.25.100
    
[/FORMAT]

    and I simply am not able to spot the relevant difference.

    The input, output and the working template can be found here.

    (The security issue you might see when clicking the link comes from the server certificate being self-signed. You can accept a temporal exception. Btw : The ridiculous file size of the output file will be the next nut to crack. Probably something about compression.)

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