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Capturing output file of ffmpeg with vid.stab in python into a variable
How do I check whether a file exists without exceptions?Calling an external command in PythonWhat are metaclasses in Python?Finding the index of an item given a list containing it in PythonWhat is the difference between Python's list methods append and extend?How can I safely create a nested directory?Does Python have a ternary conditional operator?Using global variables in a functionHow do I list all files of a directory?Does Python have a string 'contains' substring method?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
I'm trying to write a python script to stabilize videos using ffmpeg and the vid.stab library.
My problem is that the output file doesn't seem to go through stdout, so using subprocess.Popen() returns an empty variable.
cmd1=["ffmpeg", "-i","./input.MOV", "-vf", "vidstabdetect=stepsize=6:shakiness=10:accuracy=15", "-f","null","pipe:1"]
p = subprocess.Popen(cmd1, stdout=subprocess.PIPE)
vectors, err = p.communicate()
The issues is that vibstabdetect takes a filter called result, and outputs a file to whatever's specified there, and stdout remains empty. (If there's no result specified it defaults to transforms.trf.)
Is there a way to get the contents of the result file?
When running the script with the code above it executes without error, but the file is created with the default name and the variable remains empty.
python video ffmpeg image-stabilization
asked Mar 24 at 12:36
CircoCirco
1034
|
show 3 more comments
I'm trying to write a python script to stabilize videos using ffmpeg and the vid.stab library.
My problem is that the output file doesn't seem to go through stdout, so using subprocess.Popen() returns an empty variable.
cmd1=["ffmpeg", "-i","./input.MOV", "-vf", "vidstabdetect=stepsize=6:shakiness=10:accuracy=15", "-f","null","pipe:1"]
p = subprocess.Popen(cmd1, stdout=subprocess.PIPE)
vectors, err = p.communicate()
The issues is that vibstabdetect takes a filter called result, and outputs a file to whatever's specified there, and stdout remains empty. (If there's no result specified it defaults to transforms.trf.)
Is there a way to get the contents of the result file?
When running the script with the code above it executes without error, but the file is created with the default name and the variable remains empty.
python video ffmpeg image-stabilization
asked Mar 24 at 12:36
CircoCirco
1034
can't you just output the data with ffmpeg as an actual file, and read it in with python?
– user3469811
Mar 24 at 12:40
That's how I'm doing it currently, but I was wondering if there was a way to avoid that.
– Circo
Mar 24 at 12:46
-f fmt (input/output): Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases.maybe you have to set -f argument, because you do not explicitly produce an output file
– user3469811
Mar 24 at 13:04
Which OS is this?
– Gyan
Mar 24 at 15:20
@user3469811 there's already an explicit output - it's pipe:1 in this case. But that output is empty, the generated comes from the result filter. The -f null is used to specify that there's no file extension, as nothing is generated there because stdout is empty.
– Circo
Mar 24 at 15:29
|
show 3 more comments
I'm trying to write a python script to stabilize videos using ffmpeg and the vid.stab library.
My problem is that the output file doesn't seem to go through stdout, so using subprocess.Popen() returns an empty variable.
cmd1=["ffmpeg", "-i","./input.MOV", "-vf", "vidstabdetect=stepsize=6:shakiness=10:accuracy=15", "-f","null","pipe:1"]
p = subprocess.Popen(cmd1, stdout=subprocess.PIPE)
vectors, err = p.communicate()
The issues is that vibstabdetect takes a filter called result, and outputs a file to whatever's specified there, and stdout remains empty. (If there's no result specified it defaults to transforms.trf.)
Is there a way to get the contents of the result file?
When running the script with the code above it executes without error, but the file is created with the default name and the variable remains empty.
python video ffmpeg image-stabilization
asked Mar 24 at 12:36
CircoCirco
1034
I'm trying to write a python script to stabilize videos using ffmpeg and the vid.stab library.
My problem is that the output file doesn't seem to go through stdout, so using subprocess.Popen() returns an empty variable.
cmd1=["ffmpeg", "-i","./input.MOV", "-vf", "vidstabdetect=stepsize=6:shakiness=10:accuracy=15", "-f","null","pipe:1"]
p = subprocess.Popen(cmd1, stdout=subprocess.PIPE)
vectors, err = p.communicate()
The issues is that vibstabdetect takes a filter called result, and outputs a file to whatever's specified there, and stdout remains empty. (If there's no result specified it defaults to transforms.trf.)
Is there a way to get the contents of the result file?
When running the script with the code above it executes without error, but the file is created with the default name and the variable remains empty.
python video ffmpeg image-stabilization
python video ffmpeg image-stabilization
asked Mar 24 at 12:36
CircoCirco
1034
asked Mar 24 at 12:36
CircoCirco
1034
asked Mar 24 at 12:36
CircoCirco
1034
asked Mar 24 at 12:36
CircoCirco
1034
asked Mar 24 at 12:36
CircoCirco
1034
1034
can't you just output the data with ffmpeg as an actual file, and read it in with python?
– user3469811
Mar 24 at 12:40
That's how I'm doing it currently, but I was wondering if there was a way to avoid that.
– Circo
Mar 24 at 12:46
-f fmt (input/output): Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases.maybe you have to set -f argument, because you do not explicitly produce an output file
– user3469811
Mar 24 at 13:04
Which OS is this?
– Gyan
Mar 24 at 15:20
@user3469811 there's already an explicit output - it's pipe:1 in this case. But that output is empty, the generated comes from the result filter. The -f null is used to specify that there's no file extension, as nothing is generated there because stdout is empty.
– Circo
Mar 24 at 15:29
|
show 3 more comments
can't you just output the data with ffmpeg as an actual file, and read it in with python?
– user3469811
Mar 24 at 12:40
That's how I'm doing it currently, but I was wondering if there was a way to avoid that.
– Circo
Mar 24 at 12:46
-f fmt (input/output): Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases.maybe you have to set -f argument, because you do not explicitly produce an output file
– user3469811
Mar 24 at 13:04
Which OS is this?
– Gyan
Mar 24 at 15:20
@user3469811 there's already an explicit output - it's pipe:1 in this case. But that output is empty, the generated comes from the result filter. The -f null is used to specify that there's no file extension, as nothing is generated there because stdout is empty.
– Circo
Mar 24 at 15:29
can't you just output the data with ffmpeg as an actual file, and read it in with python?
– user3469811
Mar 24 at 12:40
can't you just output the data with ffmpeg as an actual file, and read it in with python?
– user3469811
Mar 24 at 12:40
That's how I'm doing it currently, but I was wondering if there was a way to avoid that.
– Circo
Mar 24 at 12:46
That's how I'm doing it currently, but I was wondering if there was a way to avoid that.
– Circo
Mar 24 at 12:46
-f fmt (input/output): Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases. maybe you have to set -f argument, because you do not explicitly produce an output file– user3469811
Mar 24 at 13:04
-f fmt (input/output): Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases. maybe you have to set -f argument, because you do not explicitly produce an output file– user3469811
Mar 24 at 13:04
Which OS is this?
– Gyan
Mar 24 at 15:20
Which OS is this?
– Gyan
Mar 24 at 15:20
@user3469811 there's already an explicit output - it's pipe:1 in this case. But that output is empty, the generated comes from the result filter. The -f null is used to specify that there's no file extension, as nothing is generated there because stdout is empty.
– Circo
Mar 24 at 15:29
@user3469811 there's already an explicit output - it's pipe:1 in this case. But that output is empty, the generated comes from the result filter. The -f null is used to specify that there's no file extension, as nothing is generated there because stdout is empty.
– Circo
Mar 24 at 15:29
|
show 3 more comments
1 Answer
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You need to specify stdout for the filter logging data, not the transcoded output from ffmpeg, which is what your current -f null pipe:1 does.
However, the vidstabdetect filter uses the POSIX fopen to open the destination for the transform data, unlike most other filters which use the internal avio_open. For fopen, pipe:1 is not acceptable. For Windows, CON, and for linux, /dev/stdout, as you confirmed, is required.
answered Mar 24 at 16:55
GyanGyan
36.2k23374
add a comment |
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You need to specify stdout for the filter logging data, not the transcoded output from ffmpeg, which is what your current -f null pipe:1 does.
However, the vidstabdetect filter uses the POSIX fopen to open the destination for the transform data, unlike most other filters which use the internal avio_open. For fopen, pipe:1 is not acceptable. For Windows, CON, and for linux, /dev/stdout, as you confirmed, is required.
answered Mar 24 at 16:55
GyanGyan
36.2k23374
add a comment |
You need to specify stdout for the filter logging data, not the transcoded output from ffmpeg, which is what your current -f null pipe:1 does.
However, the vidstabdetect filter uses the POSIX fopen to open the destination for the transform data, unlike most other filters which use the internal avio_open. For fopen, pipe:1 is not acceptable. For Windows, CON, and for linux, /dev/stdout, as you confirmed, is required.
answered Mar 24 at 16:55
GyanGyan
36.2k23374
add a comment |
You need to specify stdout for the filter logging data, not the transcoded output from ffmpeg, which is what your current -f null pipe:1 does.
However, the vidstabdetect filter uses the POSIX fopen to open the destination for the transform data, unlike most other filters which use the internal avio_open. For fopen, pipe:1 is not acceptable. For Windows, CON, and for linux, /dev/stdout, as you confirmed, is required.
answered Mar 24 at 16:55
GyanGyan
36.2k23374
You need to specify stdout for the filter logging data, not the transcoded output from ffmpeg, which is what your current -f null pipe:1 does.
However, the vidstabdetect filter uses the POSIX fopen to open the destination for the transform data, unlike most other filters which use the internal avio_open. For fopen, pipe:1 is not acceptable. For Windows, CON, and for linux, /dev/stdout, as you confirmed, is required.
answered Mar 24 at 16:55
GyanGyan
36.2k23374
answered Mar 24 at 16:55
GyanGyan
36.2k23374
answered Mar 24 at 16:55
GyanGyan
36.2k23374
answered Mar 24 at 16:55
GyanGyan
36.2k23374
36.2k23374
add a comment |
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can't you just output the data with ffmpeg as an actual file, and read it in with python?
– user3469811
Mar 24 at 12:40
That's how I'm doing it currently, but I was wondering if there was a way to avoid that.
– Circo
Mar 24 at 12:46
-f fmt (input/output): Force input or output file format. The format is normally auto detected for input files and guessed from the file extension for output files, so this option is not needed in most cases.maybe you have to set -f argument, because you do not explicitly produce an output file– user3469811
Mar 24 at 13:04
Which OS is this?
– Gyan
Mar 24 at 15:20
@user3469811 there's already an explicit output - it's pipe:1 in this case. But that output is empty, the generated comes from the result filter. The -f null is used to specify that there's no file extension, as nothing is generated there because stdout is empty.
– Circo
Mar 24 at 15:29