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Code Issues Wiki Activity

Export audio in videos with custom delay

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This commit is contained in:
Emmanouil Papadeas 2024-12-09 20:54:04 +02:00
parent 1088a8bbe7
commit ecd479b4e2
2 changed files with 32 additions and 19 deletions
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50
src/Autoload/Export.gd
View file

@ -531,43 +531,55 @@ func export_video(export_paths: PackedStringArray, project: Project) -> bool:
Global.popup_error(tr(fail_text))
_clear_temp_folder()
return false
# ffmpeg -i input1 -i input2 ... -i inputn -filter_complex amix=inputs=n output_path
# Find audio layers
var ffmpeg_combine_audio: PackedStringArray = ["-y"]
var audio_layer_count := 0
var max_audio_duration := 0
var adelay_string := ""
for layer in project.layers:
if layer is AudioLayer and layer.audio is AudioStreamMP3:
var temp_file_name := str(audio_layer_count + 1).pad_zeros(number_of_digits) + ".mp3"
var temp_file_path := temp_path_real.path_join(temp_file_name)
var temp_audio_file := FileAccess.open(temp_file_path, FileAccess.WRITE)
temp_audio_file.store_buffer(layer.audio.data)
audio_layer_count += 1
ffmpeg_combine_audio.append("-i")
ffmpeg_combine_audio.append(temp_file_path)
var delay: int = layer.playback_position * 1000
# [n]adelay=delay_in_ms:all=1[na]
adelay_string += (
"[%s]adelay=%s:all=1[%sa];" % [audio_layer_count, delay, audio_layer_count]
)
audio_layer_count += 1
if layer.audio.get_length() >= max_audio_duration:
max_audio_duration = layer.audio.get_length()
if audio_layer_count > 0:
# If we have audio layers, merge them all into one file.
var amix_inputs_string := "amix=inputs=%s" % audio_layer_count
for i in audio_layer_count:
adelay_string += "[%sa]" % i
var amix_inputs_string := "amix=inputs=%s[a]" % audio_layer_count
var final_filter_string := adelay_string + amix_inputs_string
var audio_file_path := temp_path_real.path_join("audio.mp3")
ffmpeg_combine_audio.append_array(
PackedStringArray(["-filter_complex", amix_inputs_string, audio_file_path])
PackedStringArray(
["-filter_complex", final_filter_string, "-map", '"[a]"', audio_file_path]
)
)
OS.execute(Global.ffmpeg_path, ffmpeg_combine_audio, [], true)
var copied_video := temp_path_real.path_join("video." + export_paths[0].get_extension())
# Then mix the audio file with the video.
DirAccess.copy_absolute(export_paths[0], copied_video)
# ffmpeg -y -i video_file -i input_audio -c:v copy -map 0:v:0 -map 1:a:0 video_file
var ffmpeg_final_video: PackedStringArray = [
"-y", "-i", copied_video, "-i", audio_file_path
]
if max_audio_duration > video_duration:
ffmpeg_final_video.append("-shortest")
ffmpeg_final_video.append_array(
["-c:v", "copy", "-map", "0:v:0", "-map", "1:a:0", export_paths[0]]
)
OS.execute(Global.ffmpeg_path, ffmpeg_final_video, [], true)
# ffmpeg -i input1 -i input2 ... -i inputn -filter_complex amix=inputs=n output_path
var combined_audio_success := OS.execute(Global.ffmpeg_path, ffmpeg_combine_audio, [], true)
if combined_audio_success == 0 or combined_audio_success == 1:
var copied_video := temp_path_real.path_join("video." + export_paths[0].get_extension())
# Then mix the audio file with the video.
DirAccess.copy_absolute(export_paths[0], copied_video)
# ffmpeg -y -i video_file -i input_audio -c:v copy -map 0:v:0 -map 1:a:0 video_file
var ffmpeg_final_video: PackedStringArray = [
"-y", "-i", copied_video, "-i", audio_file_path
]
if max_audio_duration > video_duration:
ffmpeg_final_video.append("-shortest")
ffmpeg_final_video.append_array(
["-c:v", "copy", "-map", "0:v:0", "-map", "1:a:0", export_paths[0]]
)
OS.execute(Global.ffmpeg_path, ffmpeg_final_video, [], true)
_clear_temp_folder()
return true

1
src/Classes/Layers/AudioLayer.gd
View file

@ -7,6 +7,7 @@ var audio: AudioStream:
set(value):
audio = value
audio_changed.emit()
var playback_position := 0.0 ## Measured in seconds.
func _init(_project: Project, _name := "") -> void: