How to preview the ffmpeg command line while using ffmpeg-python - python

Let's say I implement the following python script that uses ffmpeg-python:
# facetime.py
import ffmpeg
ffmpeg \
.input(
'FaceTime',
format='avfoundation',
pix_fmt='uyvy422',
framerate=30
) \
.output(
'out.mp4',
pix_fmt='yuv420p',
vframes=100
) \
.run()
Is there a mechanism to print to the stdout the corresponding ffmpeg command that will be executed?


Found it:
cmd = ffmpeg \
.input(
'FaceTime',
format='avfoundation',
pix_fmt='uyvy422',
framerate=30
) \
.output(
'out.mp4',
pix_fmt='yuv420p',
vframes=100
)
args = cmd.get_args()
print(f'Args: {args}')
Output:
Args: ['-f', 'avfoundation', '-framerate', '30', '-pix_fmt', 'uyvy422', '-i', 'FaceTime', '-pix_fmt', 'yuv420p', '-vframes', '100', 'out.mp4']

Related

Screen grab with ffmpy

I'm trying to screen record a section of my screen using ffmpy. But I keep getting an error.
ffmpy.FFRuntimeError: ffmpeg -f gdigrab -framerate 30 -offset_x 303 -offset_y 230 -video_size 1319x865 -i desktop -c:v libx264 -preset ultrafast output.mp4 exited with status 1 STDOUT: STDERR:
Here is my code.
from ffmpy import FFmpeg
left = 303
top = 230
width = 1319
height = 865
input_str = "-f gdigrab -framerate 30 -offset_x {} -offset_y {} -video_size {}x{}".format(left, top, width, height)
output_str = "desktop -c:v libx264 -preset ultrafast output.mp4"
ff = FFmpeg("ffmpeg", "{} -i {}".format(input_str, output_str))
ff.run()
Not sure why it's complaining, the output command listed in the error, works if I copy paste it into a cmd, I'm looking at ffmpy because later I'm going to get left,top,width,height calculated as the script starts.

['kenlm/build/bin/build_binary', '-a', '255', '-q', '8', '-v', 'trie', 'lm_filtered.arpa', '/content/lm.binary']' returned non-zero exit status 1

During the build of lm binay to create scorer doe deepspeech model I was getting the following error again and again
subprocess.CalledProcessError: Command '['/content/kenlm/build/bin/build_binary', '-a', '255', '-q', '8', '-v', 'trie', '/content/lm_filtered.arpa', '/content/lm.binary']' returned non-zero exit status 1.
The command I was using is as below
!python /content/DeepSpeech/data/lm/generate_lm.py \
--input_txt /content/transcripts.txt \
--output_dir /content/scorer/ \
--top_k 50000 \
--kenlm_bins /content/kenlm/build/bin/ \
--arpa_order 5 --max_arpa_memory "95%" --arpa_prune "0|0|1" \
--binary_a_bits 255 --binary_q_bits 8 --binary_type trie

Following worked for me
Go to
DeepSpeech -> data -> lm -> generate_lm.py
Now find following stack of code inside it
subprocess.check_call(
[
os.path.join(args.kenlm_bins, "build_binary"),
"-a",
str(args.binary_a_bits),
"-q",
str(args.binary_q_bits),
"-v",
args.binary_type,
filtered_path,
binary_path,
]
Tweak the code by adding "-s" flag in it as below
subprocess.check_call(
[
os.path.join(args.kenlm_bins, "build_binary"),
"-a",
str(args.binary_a_bits),
"-q",
str(args.binary_q_bits),
"-v",
args.binary_type,
filtered_path,
binary_path,
"-s"
]
Now your command will run fine

FFMPEG Frame-exact Video Cropping

Goal: To crop a video at a specific frame using FFMPEG
Problem: Video freezes at the end for ~1s
I'm new to FFMPEG, so not sure if any other details are needed to debug this.
import subprocess
import datetime
# Calculate start and end times in hh:mm:ss.ms
start_frame, end_frame = (9553, 10181)
start_time = str(datetime.timedelta(seconds=start_frame/fps))
end_time = str(datetime.timedelta(seconds=end_frame/fps))
cmd = ['ffmpeg', '-y', '-ss', start_time, '-to', end_time, '-i', input_path, '-c', 'copy', clip_path]
subprocess.call(cmd)
Values:
Start Frame: 9553
End Frame: 10181
Start Time: 0:06:22.120000
End Time: 0:06:47.240000

You will have to cut on key frames only or remove -c copy and re-encode.

Python subprocess - returned non-zero exit status 1

I want to execute this UNIX command using python 3.6 and subprocess module:
cat report_html | ./wkhtmltopdf - test.pdf
What I tried
import subprocess
report_html = "<html><body><h1>Hello World</h1></body></html>"
subprocess.run(['cat', report_html, '|', '/tmp/wkhtmltopdf', '-', '/tmp/test.pdf'], check=True)
Error I am getting
{
"errorMessage": "Command '['cat', '<html><body><h1>Hello World</h1></body></html>', '|', '/tmp/wkhtmltopdf', '-', '/tmp/test.pdf']' returned non-zero exit status 1.",
"errorType": "CalledProcessError",
"stackTrace": [
[
"/var/task/lambda_function.py",
30,
"lambda_handler",
"subprocess.run(['cat', report_html, '|', '/tmp/wkhtmltopdf', '-', '/tmp/test.pdf'], check=True)"
],
[
"/var/lang/lib/python3.6/subprocess.py",
438,
"run",
"output=stdout, stderr=stderr)"
]
]
}
Please guide me on how to fix this.

If you want to use pipe in subprocess, you must use shell=True argument, which is not the best solution for multiple reasons.
Usually, this is done by running two separate processes and pass the output of the first one into the second one, for example:
cat = subprocess.Popen(['cat', 'report_html'], stdout=subprocess.PIPE) # Change stdout to PIPE
output = subprocess.check_output(['wkhtmltopdf', '-', 'xxx.pdf'], stdin=cat.stdout) # Get stdin from cat.stdout

avconv with subprocess

It's seems like I never really manage to wrap my head around subprocess. This commandline works in bash
avconv -i "concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts" -vcodec copy -acodec copy /tmp/test1.ts
Bu if I try this:
cmdline = ['avconv', '-i "concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts"', '-vcodec copy', '-acodec copy', '/tmp/test1.ts']
subprocess.call(cmdline)
It exit avconv with the following error:
avconv version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
built on Jun 12 2012 16:52:09 with gcc 4.6.3
Unrecognized option 'i "concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts"'
Failed to set value '-vcodec copy' for option 'i "concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts"'
1
I've tried some variants (including shell=True) but I can't figure out the problem.
Update
Cjb made an answer that really worked. But my real code is more complicated. I believe it's hard to get something out of it. But I throw it in here just in case there is an obvoius problem that I missed.
def run_avconv(output_dir, fnames):
full_fnames = [os.path.join(output_dir, fname.replace('\n', ''))
for fname in fnames]
concatted_files = '|'.join(full_fnames)
cmd_line = [AVCONV_CMD,
'-i',
'"concat:' + concatted_files + '"',
'-vcodec',
'copy',
'-acodec',
'copy',
os.path.join(output_dir, 'out.ts')]
subprocess.Popen(cmd_line)
the full_fnames variable is:
['/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment2.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment3.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment4.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment5.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment6.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment7.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment8.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment9.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment10.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment11.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment12.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment13.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment14.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment15.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment16.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment17.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment18.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment19.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment20.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment21.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment22.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment23.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment24.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment25.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment26.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment27.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment28.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment29.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment30.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment31.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment32.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment33.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment34.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment35.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment36.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment37.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment38.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment39.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment40.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment41.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment42.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment43.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment44.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment45.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment46.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment47.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment48.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment49.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment50.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment51.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment52.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment53.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment54.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment55.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment56.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment57.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment58.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment59.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment60.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment61.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment62.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment63.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment64.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment65.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment66.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment67.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment68.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment69.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment70.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment71.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment72.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment73.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment74.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment75.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment76.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment77.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment78.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment79.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment80.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment81.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment82.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment83.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment84.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment85.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment86.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment87.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment88.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment89.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment90.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment91.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment92.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment93.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment94.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment95.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment96.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment97.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment98.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment99.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment100.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment101.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment102.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment103.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment104.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment105.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment106.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment107.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment108.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment109.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment110.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment111.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment112.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment113.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment114.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment115.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment116.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment117.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment118.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment119.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment120.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment121.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment122.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment123.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment124.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment125.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment126.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment127.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment128.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment129.ts',
'/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment130.ts']

Try it with this:
cmdline = [
'avconv',
'-i',
'concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts',
'-vcodec',
'copy',
'-acodec',
'copy',
'/tmp/test1.ts',
]
subprocess.call(cmdline)
You really want to pass each separate part as a different item in the list.

The answer by #djc is correct, however if you wanted to work by copying and pasting a string, you can do something like this:
import shlex
from pprint import pprint
cmd = """avconv -i "concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts" -vcodec copy -acodec copy /tmp/test1.ts"""
for_subprocess = shlex.split(cmd)
pprint(for_subprocess)
['avconv',
'-i',
'concat:/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment0.ts|/tmp/BABAR_AND_THE_A-011A-hts-a-v1-cc3651d01841d748_Layer6/6148_Period1/segment1.ts',
'-vcodec',
'copy',
'-acodec',
'copy',
'/tmp/test1.ts']

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