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• Drawtext Effects Clipping with Zoom in and Scale animation When combining with xfade wipe

  2 août 2023, par CRAIG

  The following ffmpeg drawtext command is meant to manipulate the text with a number of filters. First it adds a wipe, then a "grow" effect and a fade.

  


  The issue is when the wipe AND scale are together the end result is partially clipped and the wipe doesn't seem to fully reveal the text as it should be doing. Almost like the scale or wipe was delayed.

  


  I have two example commands one with an xfade wipe effect and one without below.

  


  The one with xfade wipe clips text and looks like it is messing with the timing in some way as if the scale doesn't have time to finish. If I remove the xfade wipe, the scale animation and fadein are fine.

  


  I have tried to put the xfade at the end, but it has caused me more issues.

  


  Command without xfade : (Final result is not clipped)

  


  ffmpeg   -f  lavfi  -i  color=c=black@0.0:s=129x129:r=30:d=0.137,format=rgba    -f  lavfi  -i  color=c=black@0.0:s=129x129:r=30:d=0.137,format=rgba  -filter_complex  "[1:v]drawtext=expansion=none:enable='between(t,0,0.138)':fontsize=97.7886:fontcolor=0xff0000ff:text='Of':shadowcolor=0x00ff3fff:shadowx=5.9:shadowy=5.9:borderw='2.95':bordercolor='0xa200ffff':x=(w-text_w)/2:y=(h-text_h)/2[1v];[0:v]settb=AVTB,format=rgba[0v];[1v]settb=AVTB,format=rgba[1v];[1v]scale='if(between(t,0,0+0.137),0.645+((t-0)*128.355/0.137),if(gte(t,0.137),129,129))':-1:eval=frame,fade=in:st=0:d=0.137[1v];[0v][1v]overlay=x=(W-w)/2:y=(H-h)/2:threads=1"  -copyts  -c:v  prores_ks  -profile:v  4  -pix_fmt  rgba  -movflags  faststart  -r  30  -t  0.137  -y  /home/encodertraffic/subtitles/mymovie.mov

  


  Command with xfade wipe :

  


  ffmpeg   -f  lavfi  -i  color=c=black@0.0:s=129x129:r=30:d=0.137,format=rgba    -f  lavfi  -i  color=c=black@0.0:s=129x129:r=30:d=0.137,format=rgba  -filter_complex  "[1:v]drawtext=expansion=none:enable='between(t,0,0.138)':fontsize=97.7886:fontcolor=0xff0000ff:text='Of':shadowcolor=0x00ff3fff:shadowx=5.9:shadowy=5.9:borderw='2.95':bordercolor='0xa200ffff':x=(w-text_w)/2:y=(h-text_h)/2[1v];[0:v]settb=AVTB,format=rgba[0v];[1v]settb=AVTB,format=rgba[1v];[0v][1v]xfade=transition=wiperight:duration=0.137:offset=0,settb=AVTB,setpts=PTS-STARTPTS[1v];[1v]scale='if(between(t,0,0+0.137),0.645+((t-0)*128.355/0.137),if(gte(t,0.137),129,129))':-1:eval=frame,fade=in:st=0:d=0.137[1v];[0v][1v]overlay=x=(W-w)/2:y=(H-h)/2:threads=1"  -copyts  -c:v  prores_ks  -profile:v  4  -pix_fmt  rgba  -movflags  faststart  -r  30  -t  0.137  -y  mymovie2.mov

  


  Here are a couple of screenshots comparing the two at the same timestamp (the very end).

  


  The one on the left is without the wipe, the one on the right at the same timestamp is with the wipe, but you can see the text is partially clipped, it isn't at the same sacale and it isn't at full brightness almost as if the something is delaying all aspects of each filter.

  


  

  


• Layout Video Recording Like Instgram/ Ticktok Feature

  21 mars 2023, par Amarchand K

  I'm try to do record video inn different layouts like Instagram in Flutter. For this feature I used ffmpeg_kit_flutter package. I refers this solution to do this. but output video is blank, any one helps me to solve this.
the video input and output path is valid, also show the bellow error while printing,

  


  `ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
    built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
    configuration: --cross-prefix=aarch64-linux-android- --sysroot=/files/android-sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/linux-x86_64/sysroot --prefix=/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/usr/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/home/taner/Projects/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-gmp --enable-gnutls --enable-iconv --disable-sdl2 --disable-openssl --enable-zlib --enable-mediacodec
    libavutil      57. 28.100 / 57. 28.100
    libavcodec     59. 37.100 / 59. 37.100
    libavformat    59. 27.100 / 59. 27.100
    libavdevice    59.  7.100 / 59.  7.100
    libavfilter     8. 44.100 /  8. 44.100
    libswscale      6.  7.100 /  6.  7.100
    libswresample   4.  7.100 /  4.  7.100
  -vsync is deprecated. Use -fps_mode
  Passing a number to -vsync is deprecated, use a string argument as described in the manual.
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.example.tuki_taki/cache/REC1453994379216336834.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-03-21T07:15:58.000000Z
      com.android.version: 12
    Duration: 00:00:03.77, start: 0.000000, bitrate: 2204 kb/s
    Stream #0:0[0x1](eng): Video: h264, 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/smpte170m/bt709, progressive, left), 640x480, 2199 kb/s, 29.61 fps, 29.58 tbr, 90k tbn (default)
      Metadata:
        creation_time   : 2023-03-21T07:15:58.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
      Side data:
        displaymatrix: rotation of -90.00 degrees
    Stream #0:1[0x2](eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 128 kb/s (default)
      Metadata:
        creation_time   : 2023-03-21T07:15:58.000000Z
        handler_name    : SoundHandle
        vendor_id       : [0][0][0][0]
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/data/user/0/com.example.tuki_taki/cache/REC5972384708251368209.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      creation_time   : 2023-03-21T07:16:05.000000Z
      com.android.version: 12
    Duration: 00:00:02.84, start: 0.000000, bitrate: 2703 kb/s
    Stream #1:0[0x1](eng): Video: h264, 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt470bg/smpte170m/bt709, progressive, left), 640x480, 2801 kb/s, 29.61 fps, 29.58 tbr, 90k tbn (default)
      Metadata:
        creation_time   : 2023-03-21T07:16:05.000000Z
        handler_name    : VideoHandle
        vendor_id       : [0][0][0][0]
      Side data:
        displaymatrix: rotation of -90.00 degrees
    Stream #1:1[0x2](eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 128 kb/s (default)
      Metadata:
        creation_time   : 2023-03-21T07:16:05.000000Z
        handler_name    : SoundHandle
        vendor_id       : [0][0][0][0]
  Stream mapping:
    Stream #0:0 (h264) -> scale:default
    Stream #0:1 (aac) -> amix
    Stream #1:0 (h264) -> scale:default
    Stream #1:1 (aac) -> amix
    hstack:default -> Stream #0:0 (mpeg4)
    amix:default -> Stream #0:1 (aac)
  Press [q] to stop, [?] for help
  Output #0, mp4, to '/data/user/0/com.example.tuki_taki/cache/output.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      com.android.version: 12
      encoder         : Lavf59.27.100
    Stream #0:0: Video: mpeg4, 1 reference frame (mp4v / 0x7634706D), yuv420p(progressive), 960x640 (0x0) [SAR 1:1 DAR 3:2], q=2-31, 200 kb/s, 29.58 fps, 11360 tbn
      Metadata:
        encoder         : Lavc59.37.100 mpeg4
      Side data:
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono, fltp, delay 1024, 69 kb/s
      Metadata:
        encoder         : Lavc59.37.100 aac
  frame=    1 fps=0.0 q=4.3 size=       0kB time=00:00:00.23 bitrate=   1.5kbits/s speed=3.49x    


  


  [mpeg4 @ 0xb400007122ebac50] Invalid pts (8) <= last (8)&#xA;Error submitting video frame to the encoder&#xA;[aac @ 0xb4000071232208c0] Qavg : 9911.349&#xA;[aac @ 0xb4000071232208c0] 2 frames left in the queue on closing&#xA;Conversion failed`

  &#xA;

  I'm tried

  &#xA;

    `Future<void> onLayoutDone() async {&#xA;try {&#xA;  final String outputPath = await _getTempPath();   &#xA;  const String filter =&#xA;      "[0:v]scale=480:640,setsar=1[l];[1:v]scale=480:640,setsar=1[r];[l][r]hstack;[0][1]amix -vsync 0 ";    &#xA;  log("left path: ${layoutVideoPathList[0]} right : ${layoutVideoPathList[1]} $outputPath");     &#xA;  final String command =" -y -i ${layoutVideoPathList[0]} -i ${layoutVideoPathList[1]} -filter_complex$filter$outputPath -loglevel verbose"; `these paths are valid`    &#xA;     &#xA;  await FFmpegKit.execute(command).then((value) async {      &#xA;    String? error = await value.getAllLogsAsString();    &#xA;    log(error!);    &#xA;    final ReturnCode? returnCode = await value.getReturnCode();    &#xA;    if (returnCode != null) {&#xA;      setVideo(videoPath: outputPath);    &#xA;      layoutVideoPathList.clear();    &#xA;    }&#xA;  });&#xA;} catch (e) {&#xA;  log("error while  combine -========-=-=-=-=-=-=-=-=- $e");    &#xA;}`&#xA;</void>

  &#xA;

• Split h.264 stream into multiple parts in python

  31 janvier 2023, par BillPlayz

  My objective is to split an h.264 stream into multiple parts, meaning while reading the stream from a pipe i would like to save it into x second long packages (in my case 10).

  &#xA;

  I am using a libcamera-vid subprocess on my Raspberry Pi that outputs the h.264 stream into stdout.
  &#xA;Might be irrelevant, depends : libcamera-vid outputs a message every frame and I am able to locate it at isFrameStopLine&#xA;To convert the stream, I use an ffmpeg subprocess, as you can see in the code below.

  &#xA;

  Imagine it like that :
  &#xA;Stream is running...
  &#xA;- Start recording to a file
  &#xA;- Sleep x seconds
  &#xA;- Finish recording to file
  &#xA;- Start recording a new file
  &#xA;- Sleep x seconds
  &#xA;- Finish recording the new file
  &#xA;- and so on...

  &#xA;

  Here is my current code, however upon running the first export succeeds, and after the second or third the ffmpeg-subprocess is terminating with the error :
  &#xA;pipe:: Invalid data found when processing input
  &#xA;And shortly after, the python process, because of the ffmpeg termination i believe.&#xA;Traceback (most recent call last):   File "/home/survpi-camera/main.py", line 56, in <module>     processStreamLine(readData)   File "/home/survpi-camera/main.py", line 16, in processStreamLine     streamInfo["process"].stdin.write(data) BrokenPipeError: [Errno 32] Broken pipe</module>

  &#xA;

  recentStreamProcesses = []
streamInfo = {
    "lastStreamStart": -1,
    "process": None
}

def processStreamLine(data):
    isInfoLine = ((data.startswith(b"[") and (b"INFO" in data)) or (data == b"Preview window unavailable"))
    isFrameStopLine = (data.startswith(b"#") and (b" fps) exp" in data))
    if ((not isInfoLine) and (not isFrameStopLine)):
        streamInfo["process"].stdin.write(data)
    
    if (isFrameStopLine):
        if (time.time() - streamInfo["lastStreamStart"] >= 10):
            print("10 seconds passed, exporting...")
            exportStream()
            createNewStream()

def createNewStream():
    streamInfo["lastStreamStart"] = time.time()
    streamInfo["process"] = subprocess.Popen([
        "ffmpeg",
        "-r","30",
        "-i","-",
        "-c","copy",("/home/survpi-camera/" + str(round(time.time())) + ".mp4")
    ],stdin=subprocess.PIPE,stderr=subprocess.STDOUT)
    print("Created new streamProcess.")

def exportStream():
    print("Exporting...")
    streamInfo["process"].stdin.close()
    recentStreamProcesses.append(streamInfo["process"])


cameraProcess = subprocess.Popen([
    "libcamera-vid",
    "-t","0",
    "--width","1920",
    "--height","1080",
    "--codec","h264",
    "--inline",
    "--listen",
    "-o","-"
],stdout=subprocess.PIPE,stdin=subprocess.PIPE,stderr=subprocess.STDOUT)

createNewStream()

while True:
    readData = cameraProcess.stdout.readline()
    
    processStreamLine(readData)


  &#xA;

  Thank you in advance !

  &#xA;