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  • PyQt-thread. Get dynamicly output

    1er janvier 2020, par ZPro

    I use PyQt-thread for parallel conversion of mp3 files to aac via ffmpeg.
    Here is my code :

    class SubprocessThread(QThread):
    
    signal = pyqtSignal('PyQt_PyObject')
    

    
    def __init__(self, command, args):
    
        QThread.__init__(self)
    
        self.command = command
    
        self.args = args
    

    
    def __del__(self):
    
        self.wait()
    

    
    def run(self):
    
        output = subprocess.check_output('{0} {1}'.format(self.command, self.args), shell=True).split()
    
        self.signal.emit(output)

    And here is example of usage :

    threads = []
    

    
            for part in parts.keys():
    
                args = "-i \'{0}.mp3\' -c:a aac -b:a {1}k \'{2}.m4a\'".format(
    
                    os.path.join(tmp_dir, str(part)),
    
                    int(self.bitrate_cbx.currentText()),
    
                    os.path.join(tmp_dir, str(part)))
    
                print(args)  # debug
    
                ffmpeg_thread = SubprocessThread('ffmpeg', args)
    
                ffmpeg_thread.signal.connect(self.on_data_ready)
    
                threads.append(ffmpeg_thread)
    
                ffmpeg_thread.start()
    
                self.threads_count += 1

    I want to make progress bar, based on conversion, but ffmpeg always updates last string in his output (when conversion in progress).
    Here is an example of ffmpeg output while files are converting :

    user@host$ ffmpeg -i '/home/user/001.mp3' -c:a aac -b:a 128k -vn '/home/user/test.m4a' 
    
ffmpeg version n4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
    
  built with gcc 9.2.0 (GCC)
    
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
    
  libavutil      56. 31.100 / 56. 31.100
    
  libavcodec     58. 54.100 / 58. 54.100
    
  libavformat    58. 29.100 / 58. 29.100
    
  libavdevice    58.  8.100 / 58.  8.100
    
  libavfilter     7. 57.100 /  7. 57.100
    
  libswscale      5.  5.100 /  5.  5.100
    
  libswresample   3.  5.100 /  3.  5.100
    
  libpostproc    55.  5.100 / 55.  5.100
    
Input #0, mp3, from '/home/user/001.mp3':
    
  Metadata:
    
    encoder         : Lavf57.41.100
    
    title           : test
    
    artist          : test
    
    album_artist    : test
    
    album           : test
    
    composer        : test
    
    genre           : test
    
    date            : 2018
    
  Duration: 00:12:38.02, start: 0.025056, bitrate: 192 kb/s
    
    Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 192 kb/s
    
    Metadata:
    
      encoder         : Lavc57.48
    
    Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
    
    Metadata:
    
      comment         : Cover (front)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mp3 (mp3float) -> aac (native))
    
Press [q] to stop, [?] for help
    
Output #0, ipod, to '/home/user/test.m4a':
    
  Metadata:
    
    date            : test
    
    title           : test
    
    artist          : test
    
    album_artist    : test
    
    album           : test
    
    composer        : test
    
    genre           : test
    
    encoder         : Lavf58.29.100
    
    Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s
    
    Metadata:
    
      encoder         : Lavc58.54.100 aac
    
size=   12107kB time=00:12:38.01 bitrate= 130.8kbits/s speed=79.2x

    How can I receive this data (string, that begins from "size=...") from my parallel QThreads to calculate overall progress ?

  • iOS switching between audio & subtitle tracks added using ffmpeg

    27 décembre 2019, par Tony M

    Edit : Title altered to reflect that the answer and comments by @llogan cover switching between both audio and subtitle tracks.

    I have an m.mp4 with English audio and want to add a second audio stream in Italian so that I can play either language using the iPhone. When I used this command :

    ffmpeg -i m.mp4 -i ita.mp3 -c copy -map 0 -map 1 out.mp4

    the output from ffmpeg -i out.mp4 (see below) shows that a new audio stream is added, and I can switch between audio streams using the VLC player. Yet when I transfer the video to the TV app and play it on either MacOS or iOS it only plays the original English and I see no options to play other languages.

    How do I get it to be able to switch between either audio on iOS ?

    Here is the output from ffmpeg -i out.mp4:

        Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 400x300 [SAR 1:1 DAR 4:3], q=2-31, 482 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 102 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler
    
    Stream #0:2: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s
    
    Metadata:
    
      encoder         : LAME3.100
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
  Stream #1:0 -> #0:2 (copy)

  • Windows - FFmpeg - How to map a jpg file to video stream 0:0 and include only audio stream 0:2 and not stream 0:1 and 0:2 together

    21 juin 2020, par slyfox1186

    I am trying to write a batch script that begins by extracting a thumbnail "Cover.jpg" from an mkv video. My end goal is to have this script recursively loop a folder full of videos to encode them all in one go.

    



    :: create cover art jpg
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)


    



    Then I am trying to encode the 4K mkv video that I got the jpg thumbnail from to 1920x1080 resolution instead of it's native 4K to make it easier to play back on my home plex server.

    



    I have surround sound 6 channel speaker system so I want to take audio stream 0:2 which is Dolby DTS 6 channel and save some HDD space by converting it to -c:a ac3 -b:a 640k -ac 6.

    



    I have gotten stuck because I can achieve everything I want except I keep encoding 2 of the 4 audio streams available in the end. I only want to keep 1 audio stream to maximize my space savings.

    



    Here is the entire script so far.

    



    @echo off
setlocal enabledelayedexpansion
prompt $g
color 0a

pushd "%~dp0"

set FF=C:\MAB\local64\bin-video\ffmpeg.exe
set TITLE=MOVIETITLE

:: create cover art jpg file
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)

:: run ffmpeg x265
for %%I in (*.mkv) do (
set fname="%%~nxI"
set fout="%%~nI-temp.mkv"
call :runff !fname! !fout!
del /s /q *.jpg
pause
goto:eof
)

:runff
%FF% -ss 0 ^
-y ^
-i "%~1" ^
-attach "Cover.jpg" ^
-map_metadata 0 ^
-map_chapters 0 ^
-metadata title="%TITLE%" ^
-map 0:0 -metadata:s:v:0 language=eng ^
-map 0:2 -metadata:s:a:0 language=eng -metadata:s:a:0 title="Surround 5.1 (DTS)" ^
-map 0:3 -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" -metadata:s:t:0 filename="Cover.jpg" -metadata:s:t:0 mimetype="image/jpeg" ^
-c:v libx265 -preset medium ^
-x265-params crf=18:qcomp=0.8:aq-mode=1:aq_strength=1.0:qg-size=16:psy-rd=0.7:psy-rdoq=5.0:rdoq-level=1:merange=44 ^
-c:a ac3 -b:a 640k -ac 6 ^
-t 3 ^
"%~2"
exit /b


    



    Here are the output logs. https://pastebin.com/hVMy3VJW

    



    You can see towards the bottom that it is encoding both audio streams.

    



    Any ideas guys ?

    


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