You can run ffmpeg in -v error mode and have it return errors into a text file, see here: https://superuser.com/questions/100288/how-can-i-check-the-integrity-of-a-video-file-avi-mpeg-mp4 You can combine this with encoding without the null output but you will only be able to read the results from the text file.
Or you can have an additional script that will follow-up on the errors. Here is a Python example, which checks for file integrity, notice the if stdout clause. This will basically re-check encoded file if you need to see normal output first.
Solution 1:
import subprocess
import os
import sys
import re
def check_video(files):
if type(files) == str:
files = [files]
for file in files:
print(f"Checking {file}...")
command_line = f'ffmpeg -v error -i "{file}" -map 0:v -map 0:a? -vcodec copy -acodec copy -f null -'
base_name = os.path.splitext(file)[0]
extension = os.path.splitext(file)[1]
process = subprocess.Popen(command_line, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdout, stderr = process.communicate()
return_code = process.returncode
pid = process.pid
print(f"Base: {base_name}")
print(f"Extension: {extension}")
print(f"RC: {return_code}")
if stdout:
allowed_errs = ["invalid as first byte of an EBML number"]
stdout_detect = stdout.decode().split("\n")
for error in allowed_errs:
if error not in stdout_detect[0] or len(stdout_detect) > 2:
print(f"Errors!")
print(os.path.splitext(file)[1])
os.rename(file, f"{file}.error")
with open(f"{file}.error.log", "w") as errfile:
if stdout:
errfile.write(stdout.decode())
if stderr:
errfile.write(stderr.decode())
else:
print("Minor problems detected.")
else:
print("File OK.")
process.wait()
if __name__ == "__main__":
files = sys.argv[1:]
# files = ["a.mkv"]
check_video(files)
Solution 2:
with subprocess.Popen(command_line,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True) as self.process:
for line in self.process.stdout:
print(line, end='')
return_code = self.process.wait()
From here, you can do whatever you like with each line, like checking for error keywords in them. I think ffmpeg has some standard of error reporting (https://ffmpeg.org/doxygen/trunk/group__lavu__error.html). With this solution, output will be displayed to you same as with directly running ffmpeg. Source: https://stackoverflow.com/a/4417735/1793606. Tested with Python 3.10
Solution 3:
Also, you can set err_detect for ffmpeg itself, that should reflect in the return code
