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  • os.walk returns file names but when trying to modify the files it says directory not found

    13 avril 2021, par epWILL

    Im trying to walk through music folder and find all sub folders in it and convert the mp4's in all folders to wav. It prints out the correct file name but when it trys to convert it says directory not found.

    


    I would like to us os.walk to go through all folders instead going through 1 folder and changing the name in the code for the other folders

    


    This code works for one folder

    


    import os
import ffmpeg
import time

path = './musicTest/'


os.chdir(path)
aud_files = os.listdir()
count = 0
count2 = 0


    ##convert mp4 to wav
for file in aud_files:
    os.system('ffmpeg -i "{}" -acodec pcm_s16le -ac 1 -ar 16000 output-{}.wav'.format(file, count))
    count = count + 1
    os.remove(file)


    


    this is the code that gives me no directory found when using os.walk but it prints the file name

    


    import os
from pydub import AudioSegment
import ffmpeg

path = "./musicTest/"
count = 0

for i, (root, dirs, files) in enumerate(os.walk(path)):
   if root is not path:
      for file in files:
           print(file)
           os.system('ffmpeg -i "{}" -acodec pcm_s16le -ac 1 -ar 16000 output-{}.wav'.format(file, count))
           count = count + 1


    


  • subprocess call of ffmpeg returns negative value

    11 juin 2019, par Zak44

    Here is the original command line call that works at shell :

    ffmpeg -i /Users/abc/Desktop/Test/Full_Mov.mov -vf "drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf: text='SCENE BLAH BLAH - %{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: fontsize=20: box=1: boxcolor=black: boxborderw=5","format=yuv420p" -f segment -segment_frames 123 -reset_timestamps 1 -c:a copy -map 0 "/Users/abc/Desktop/Test/%03d_test40.mov"

    Getting a negative value when trying to run ffmpeg via subprocess, causing it to fail and not process. I’ve even tried dumbing down the call to just run ffmpeg by itself with no arguments, and it still returns a negative value.

    import subprocess
    
ffmpeg = "/usr/local/bin/ffmpeg"
    
source = "/Users/abc/Desktop/Test/Full_Mov.mov"
    
destination = "/Users/abc/Desktop/Test/%03d_test40.mov"
    
cmd = "%s -i %s -vf \"drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf: text='SCENE BLAH BLAH - %%{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5\",\"format=yuv420p\" -f segment -segment_frames 123 -reset_timestamps 1 -c:a copy -map 0 \"%s\"" % (ffmpeg, source, destination)
    
log("ffmpeg cmd: %s" % cmd)
    
log(subprocess.check_output(cmd, shell=True))

    When running full command :

    CalledProcessError: Command '/usr/local/bin/ffmpeg -i /Users/abc/Desktop/Full_Mov.mov -vf "drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf: text='SCENE BLAH BLAH - %{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5","format=yuv420p" -f segment -segment_frames 318 -reset_timestamps 1 -c:a copy -map 0 "/Users/abc/Desktop/Test/%03d.tmp.mov"' returned non-zero exit status -8
    
    raise CalledProcessError(retcode, cmd, output=output)

    When running just ffmpeg no arguments :

    CalledProcessError: Command '/usr/local/bin/ffmpeg' returned non-zero exit status 1
    
    raise CalledProcessError(retcode, cmd, output=output)

    Latest output with suggested changes below :

    subprocess.CalledProcessError: Command '['/usr/local/bin/ffmpeg', '-i', '/Users/szaharak/Desktop/Flix_Test/ep888_sq66_main_mov_2019_05_20_14_15.mov', '-vf', 'drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf:', 'text=SCENE BLAH BLAH - %%{frame_num}:', 'start_number=1:', 'x=(w-tw)/2:', 'y=h-(2*lh):', 'fontcolor=black:', 'fontsize=20:', 'box=1:', 'boxcolor=white:', 'boxborderw=5', 'format=yuv420p', '-f', 'segment', '-segment_frames', '123', '-reset_timestamps', '1', '-c:a', 'copy', '-map', '0', '/Users/szaharak/Desktop/Flix_Test/%03d_test40.mov']' returned non-zero exit status 1
    

    
[NULL @ 0x7f88c3012200] Unable to find a suitable output format for 'text=SCENE BLAH BLAH - %%{frame_num}:'
    
text=SCENE BLAH BLAH - %%{frame_num}:: Invalid argument

    And here is latest...

        >>> rc = subprocess.check_call(cmd)
    
ffmpeg version N-93891-ge1839283bc-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
    
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
    
  configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
    

    
  libavutil      56. 28.100 / 56. 28.100
    
  libavcodec     58. 52.102 / 58. 52.102
    
  libavformat    58. 27.103 / 58. 27.103
    
  libavdevice    58.  7.100 / 58.  7.100
    
  libavfilter     7. 53.101 /  7. 53.101
    
  libswscale      5.  4.101 /  5.  4.101
    
  libswresample   3.  4.100 /  3.  4.100
    
  libpostproc    55.  4.100 / 55.  4.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/szaharak/Desktop/Flix_Test/ep888_sq66_main_mov_2019_05_20_14_15.mov':
    
  Metadata:
    
    major_brand     : qt  
    
    minor_version   : 537199360
    
    compatible_brands: qt  
    
    creation_time   : 2019-05-14T17:58:24.000000Z
    
    com.apple.quicktime.player.movie.audio.gain: 1.000000
    
    com.apple.quicktime.player.movie.audio.treble: 0.000000
    
    com.apple.quicktime.player.movie.audio.bass: 0.000000
    
    com.apple.quicktime.player.movie.audio.balance: 0.000000
    
    com.apple.quicktime.player.movie.audio.pitchshift: 0.000000
    
    com.apple.quicktime.player.movie.audio.mute: 
    
    com.apple.quicktime.player.movie.visual.brightness: 0.000000
    
    com.apple.quicktime.player.movie.visual.color: 1.000000
    
    com.apple.quicktime.player.movie.visual.tint: 0.000000
    
    com.apple.quicktime.player.movie.visual.contrast: 1.000000
    
    com.apple.quicktime.player.version: 7.6.6 (7.6.6)
    
    com.apple.quicktime.version: 7.7.3 (2943.14) 0x7738000 (Mac OS X, 10.11.6, 15G22010)
    
  Duration: 00:01:12.67, start: 0.000000, bitrate: 23379 kb/s
    
    Stream #0:0(eng): Video: mjpeg (Baseline) (jpeg / 0x6765706A), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 72:72 DAR 16:9], 21838 kb/s, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
    
    Metadata:
    
      creation_time   : 2019-05-14T17:58:24.000000Z
    
      handler_name    : Apple Video Media Handler
    
      encoder         : Photo - JPEG
    
    Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s16, 1536 kb/s (default)
    
    Metadata:
    
      creation_time   : 2019-05-14T17:58:24.000000Z
    
      handler_name    : Apple Sound Media Handler
    
[NULL @ 0x7f8ddc8ce200] Unable to find a suitable output format for 'text=SCENE BLAH BLAH - %{frame_num}: start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5: format=yuv420p'
    
text=SCENE BLAH BLAH - %{frame_num}: start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5: format=yuv420p: Invalid argument
    
Traceback (most recent call last):
    
  File "<stdin>", line 1, in <module>
    
  File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 190, in check_call
    
    raise CalledProcessError(retcode, cmd)
    
subprocess.CalledProcessError: Command '['/usr/local/bin/ffmpeg', '-i', '/Users/szaharak/Desktop/Flix_Test/ep888_sq66_main_mov_2019_05_20_14_15.mov', '-vf', 'drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf:', 'text=SCENE BLAH BLAH - %{frame_num}: start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5: format=yuv420p', '-f', 'segment', '-segment_frames', '123', '-reset_timestamps', '1', '-c:a', 'copy', '-map', '0', '/Users/szaharak/Desktop/Flix_Test/%03d_test40.mov']' returned non-zero exit status 1
    
</module></stdin>

  • seeking with av_seek_frame returns invalid data

    27 juin 2016, par mtadmk

    Based on dranger tutorial I’m trying to implement seeking in video file. Problem is with seeking to beginning milliseconds - it always returns 0 when seeking backward, or some place in file (based on file format).

    I.e. with this video file and seeking forward to 500 pts there is always 6163 pts returned. Seeking backward to 500 is always returning 0. I have no idea why.

    Code to do this :

    import java.util.Arrays;
    
import java.util.List;
    
import org.bytedeco.javacpp.BytePointer;
    
import org.bytedeco.javacpp.DoublePointer;
    
import org.bytedeco.javacpp.PointerPointer;
    
import org.bytedeco.javacpp.avcodec;
    
import org.bytedeco.javacpp.avformat;
    
import org.bytedeco.javacpp.avutil;
    
import org.bytedeco.javacpp.swscale;
    

    
import static org.bytedeco.javacpp.avcodec.av_free_packet;
    
import static org.bytedeco.javacpp.avcodec.avcodec_close;
    
import static org.bytedeco.javacpp.avcodec.avcodec_decode_video2;
    
import static org.bytedeco.javacpp.avcodec.avcodec_find_decoder;
    
import static org.bytedeco.javacpp.avcodec.avcodec_flush_buffers;
    
import static org.bytedeco.javacpp.avcodec.avcodec_open2;
    
import static org.bytedeco.javacpp.avcodec.avpicture_fill;
    
import static org.bytedeco.javacpp.avcodec.avpicture_get_size;
    
import static org.bytedeco.javacpp.avformat.AVSEEK_FLAG_BACKWARD;
    
import static org.bytedeco.javacpp.avformat.av_dump_format;
    
import static org.bytedeco.javacpp.avformat.av_read_frame;
    
import static org.bytedeco.javacpp.avformat.av_register_all;
    
import static org.bytedeco.javacpp.avformat.av_seek_frame;
    
import static org.bytedeco.javacpp.avformat.avformat_close_input;
    
import static org.bytedeco.javacpp.avformat.avformat_find_stream_info;
    
import static org.bytedeco.javacpp.avformat.avformat_open_input;
    
import static org.bytedeco.javacpp.avutil.AVMEDIA_TYPE_VIDEO;
    
import static org.bytedeco.javacpp.avutil.AV_PIX_FMT_RGB24;
    
import static org.bytedeco.javacpp.avutil.AV_TIME_BASE;
    
import static org.bytedeco.javacpp.avutil.av_frame_alloc;
    
import static org.bytedeco.javacpp.avutil.av_frame_get_best_effort_timestamp;
    
import static org.bytedeco.javacpp.avutil.av_free;
    
import static org.bytedeco.javacpp.avutil.av_make_q;
    
import static org.bytedeco.javacpp.avutil.av_malloc;
    
import static org.bytedeco.javacpp.avutil.av_q2d;
    
import static org.bytedeco.javacpp.avutil.av_rescale_q;
    
import static org.bytedeco.javacpp.swscale.SWS_BILINEAR;
    
import static org.bytedeco.javacpp.swscale.sws_getContext;
    
import static org.bytedeco.javacpp.swscale.sws_scale;
    

    
public class SeekTest1 {
    
    private avformat.AVFormatContext videoFile;
    
    private final avcodec.AVPacket framePacket = new avcodec.AVPacket();
    
    private avcodec.AVCodecContext videoCodec;
    
    private avutil.AVFrame yuvFrame;
    
    private swscale.SwsContext scalingContext;
    
    private avutil.AVFrame rgbFrame;
    
    private int streamId;
    
    private long lastTime;
    

    
    public static void main(String[] args) {
    
        if (args.length > 0) {
    
            new SeekTest1().start(args[0]);
    
        } else {
    
            new SeekTest1().start("/path/to/file");
    
        }
    

    
    }
    

    
    private void start(String path) {
    
        init(path);
    
        //test for forward
    
//        List<integer> seekPos = Arrays.asList(0, 100, 0, 200, 0, 300, 0, 400, 0, 500, 0, 600, 0, 700);
    
        //test for backward
    
        List<integer> seekPos = Arrays.asList(10000, 8000, 10000, 7000, 10000, 6000, 10000, 4000, 10000, 2000, 10000, 1000, 10000, 200);
    
        seekPos.forEach(seekPosition -> {
    
            readFrame();
    
            seek(seekPosition);
    
        });
    
        readFrame();
    
        cleanUp();
    
    }
    

    
    long seek(long seekPosition) {
    
        final avutil.AVRational timeBase = fetchTimeBase();
    
        long timeInBaseUnit = fetchTimeInBaseUnit(seekPosition, timeBase);
    

    
        //changing flag to AVSEEK_FLAG_ANY does not change behavior
    
        int flag = 0;
    
        if (timeInBaseUnit &lt; lastTime) {
    
            flag = AVSEEK_FLAG_BACKWARD;
    
            System.out.println("seeking backward to " + timeInBaseUnit);
    
        } else {
    
            System.out.println("seeking forward to " + timeInBaseUnit);
    
        }
    
        avcodec_flush_buffers(videoCodec);
    
        av_seek_frame(videoFile, streamId, timeInBaseUnit, flag);
    
        return timeInBaseUnit;
    
    }
    

    
    private long fetchTimeInBaseUnit(long seekPositionMillis, avutil.AVRational timeBase) {
    
        return av_rescale_q((long) (seekPositionMillis / 1000.0 * AV_TIME_BASE), av_make_q(1, AV_TIME_BASE), timeBase);
    
    }
    

    
    private void readFrame() {
    
        while (av_read_frame(videoFile, framePacket) >= 0) {
    
            if (framePacket.stream_index() == streamId) {
    
                // Decode video frame
    
                final int[] frameFinished = new int[1];
    
                avcodec_decode_video2(this.videoCodec, yuvFrame, frameFinished, framePacket);
    

    
                if (frameFinished[0] != 0) {
    
                    av_free_packet(framePacket);
    
                    long millis = produceFinishedFrame();
    
                    System.out.println("produced time " + millis);
    
                    break;
    
                }
    
            }
    
            av_free_packet(framePacket);
    
        }
    
    }
    

    
    private long produceFinishedFrame() {
    
        sws_scale(scalingContext, yuvFrame.data(), yuvFrame.linesize(), 0,
    
            videoCodec.height(), rgbFrame.data(), rgbFrame.linesize());
    
        final long pts = av_frame_get_best_effort_timestamp(yuvFrame);
    
        final double timeBase = av_q2d(fetchTimeBase());
    
        final long foundMillis = (long) (pts * 1000 * timeBase);
    
        lastTime = foundMillis;
    
        return foundMillis;
    
    }
    

    
    private avutil.AVRational fetchTimeBase() {
    
        return videoFile.streams(streamId).time_base();
    
    }
    

    
    private void init(String videoPath) {
    
        final avformat.AVFormatContext videoFile = new avformat.AVFormatContext(null);
    

    
        av_register_all();
    
        if (avformat_open_input(videoFile, videoPath, null, null) != 0) throw new RuntimeException("unable to open");
    
        if (avformat_find_stream_info(videoFile, (PointerPointer) null) &lt; 0) throw new RuntimeException("Couldn't find stream information");
    

    
        av_dump_format(videoFile, 0, videoPath, 0);
    

    
        final int streamId = findFirstVideoStream(videoFile);
    

    
        final avcodec.AVCodecContext codec = videoFile.streams(streamId).codec();
    

    
        final avcodec.AVCodec pCodec = avcodec_find_decoder(codec.codec_id());
    
        if (pCodec == null) throw new RuntimeException("Unsupported codec");
    

    
        if (avcodec_open2(codec, pCodec, (avutil.AVDictionary) null) &lt; 0) throw new RuntimeException("Could not open codec");
    

    
        final avutil.AVFrame yuvFrame = av_frame_alloc();
    

    
        final avutil.AVFrame rgbFrame = av_frame_alloc();
    
        if (rgbFrame == null) throw new RuntimeException("Can't allocate avframe");
    

    
        final int numBytes = avpicture_get_size(AV_PIX_FMT_RGB24, codec.width(), codec.height());
    
        final BytePointer frameBuffer = new BytePointer(av_malloc(numBytes));
    

    
        final swscale.SwsContext swsContext = sws_getContext(codec.width(), codec.height(), codec.pix_fmt(), codec.width(), codec.height(),
    
            AV_PIX_FMT_RGB24, SWS_BILINEAR, null, null, (DoublePointer) null);
    

    
        avpicture_fill(new avcodec.AVPicture(rgbFrame), frameBuffer, AV_PIX_FMT_RGB24, codec.width(), codec.height());
    

    
        this.videoFile = videoFile;
    
        this.videoCodec = codec;
    
        this.yuvFrame = yuvFrame;
    
        this.scalingContext = swsContext;
    
        this.rgbFrame = rgbFrame;
    
        this.streamId = streamId;
    
    }
    

    
    private static int findFirstVideoStream(avformat.AVFormatContext videoFile) {
    
        int videoStream = -1;
    
        for (int i = 0; i &lt; videoFile.nb_streams(); i++) {
    
            if (videoFile.streams(i).codec().codec_type() == AVMEDIA_TYPE_VIDEO) {
    
                videoStream = i;
    
                break;
    
            }
    
        }
    
        if (videoStream == -1) throw new RuntimeException("Didn't find video stream");
    
        return videoStream;
    
    }
    

    
    private void cleanUp() {
    
        av_free(this.rgbFrame);
    
        av_free(yuvFrame);
    
        avcodec_close(videoCodec);
    
        avformat_close_input(videoFile);
    
    }
    
}
    
</integer></integer>

    As input arg should be provided file from above.

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