Normally my input has an audio. When I convert my input with following code, the output is muted.
ffmpeg.input("input.webm").filter("scale", force_original_aspect_ratio="decrease", force_divisible_by=2).output(("out.mp4"), vcodec="libx264", r=60, preset='fast').run()
.filter() function causes it and I don't know how to fix it. I want to use filter, but I want to keep the audio same also.
Thank you for your help.
Apply the filter to video (only), and pass the filtered video and the original audio as arguments to output(...):
import ffmpeg
v = ffmpeg.input("input.webm").video.filter("scale", force_original_aspect_ratio="decrease", force_divisible_by=2)
a = ffmpeg.input("input.webm").audio
ffmpeg.output(v, a, "out.mp4", vcodec="libx264", r=60, preset='fast', acodec='aac').overwrite_output().run()
In case you want it in one line:
ffmpeg.output(ffmpeg.input("input.webm").video.filter("scale", force_original_aspect_ratio="decrease", force_divisible_by=2), ffmpeg.input("input.webm").audio, "out.mp4", vcodec="libx264", r=60, preset='fast', acodec='aac').overwrite_output().run()
For getting the equivalent command line, you may add -report global argument, and check the log file:
ffmpeg.output(ffmpeg.input("input.webm").video.filter("scale", force_original_aspect_ratio="decrease", force_divisible_by=2), ffmpeg.input("input.webm").audio, "out.mp4", vcodec="libx264", r=60, preset='fast', acodec='aac').global_args('-report').overwrite_output().run()
According to the log file, the equivalent command line is:
ffmpeg -i input.webm -filter_complex "[0:v]scale=force_divisible_by=2:force_original_aspect_ratio=decrease[s0]" -map "[s0]" -map 0:a -acodec aac -preset fast -r 60 -vcodec libx264 out.mp4 -report -y
As you can see, -filter_complex is used, the filtered video is mapped with -map "[s0]" and the audio is mapped with -map 0:a.