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  • Start Android Java VM from native C code NDK (ffmpeg mediacodec use)

    19 April, by eusoubrasileiro

    I managed to cross-compile ffmpeg using the NDK for armv8a api 27 with MediaCodec hardware acceleration support.

    Using root after setting permissions, folders and setting properly LD_LIBRARY_PATH etc. I can run it without problems on a terminal session (ssh). Only if I don't try to use the -hwaccel option.

    If try to run something using -hwaccel, like:

    ffmpeg -rtsp_transport tcp -an -hwaccel mediacodec -c:v hevc_mediacodec -i rtsp://user:pass@192.168.0.100:554/onvif1 -f null - -benchmark

    I get the error bellow about No Java virtual machine.

    ...
Input #0, rtsp, from 'rtsp://user:pass@192.168.0.100:554/onvif1':
  Metadata:
    title           : H.265 Video, RtspServer_0.0.0.2
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: hevc (Main), yuv420p(tv, bt470bg), 1920x1080 [SAR 1:1 DAR 16:9], 10 fps, 10 tbr, 90k tbn, 10 tbc
    Stream #0:1: Audio: pcm_alaw, 8000 Hz, mono, s16, 64 kb/s
[amediaformat @ 0x7e2ea27300] No Java virtual machine has been registered
[hevc_mediacodec @ 0x7e2eb44f00] Failed to create media format
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (hevc_mediacodec) -> wrapped_avframe (native))
Error while opening decoder for input stream #0:0 : Generic error in an external library

    Would it be possible to start (create or launch?) the Dalvik Java VM directly from the C code? I don't even know if those are correct terms. Make it visible for ffmpeg?

    Any information that will help a Android Newbie get on his feet will be greatly appreciated. If that is possible I would write a little patch on the ffmpeg code.

    I really would not like to package this in an app only to be able to test around with this.

  • Can I pass a list of image into the input method of ffmpeg-python

    18 April, by Horla.li

    My task involves using ffmpeg to create video from image sequence. the code belows solves the problem.

    import ffmpeg

video = ffmpeg.input('/path/to/images/*.jpg', pattern_type='glob',framerate=20).output(video.mp4).run()

    However since the image data we are getting follows the pattern

    1.jpg,
2.jpg,
3.jpg
.
.
20.jpg
.
.
100.jpg

    the video get created with the glob pattern 1.jpg, 100.jpg, 11.jpg, 12.jpg, ... 2.jpg, 20.jpg, 21.jpg ... which is very unpleasant to watch.

    Is there anyway I can pass a list or anything else aside a path/glob pattern where the images are sorted in order. Also as a bonus I will be happy if I can choose which files to add as an the input method input()

  • ffmpeg concat of two files results in malformed video

    18 April, by Stas Ezersky

    I processing two videos as follows:

    ffmpeg -i video-raw/455848793538790988_duration18.051.mp4 -b:v 993k -b:a 128k -vf "scale=720x1280:force_original_aspect_ratio=decrease,pad=720:1280:(ow-iw)/2:(oh-ih)/2,setsar=1:1" video-proc/455848793538790988_duration18.051.mp4

    and

    ffmpeg -i video-raw/14425661295137552_duration11.666.mp4  -b:v 993k -b:a 128k -vf "scale=720x1280:force_original_aspect_ratio=decrease,pad=720:1280:(ow-iw)/2:(oh-ih)/2,setsar=1:1" video-proc/14425661295137552_duration11.666.mp4

    then running the following command to concat:

    ffmpeg -f concat -safe 0 -i video-concat/dogs-2021-04-17-06-46-id-1.txt -c:v copy -c:a copy ./output.mp4

    the resulting video starts properly but when getting to the second video the image stuck and and sound becomes slow.

    The ffprobe results are as follow:

    Before processing:

    ffprobe video-raw/14425661295137552_duration11.666.mp4 

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video-raw/14425661295137552_duration11.666.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:11.68, start: 0.000000, bitrate: 565 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 640x800 [SAR 1:1 DAR 4:5], 462 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

    for the second one:

    ffprobe video-raw/455848793538790988_duration18.051.mp4

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video-raw/455848793538790988_duration18.051.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:18.07, start: 0.000000, bitrate: 655 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt709/bt709), 576x1024 [SAR 1:1 DAR 9:16], 585 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 62 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

    after processing:

    ffprobe video-proc/14425661295137552_duration11.666.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video-proc/14425661295137552_duration11.666.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:11.70, start: 0.000000, bitrate: 1133 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 993 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 130 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

    and the second one

    ffprobe video-proc/455848793538790988_duration18.051.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video-proc/455848793538790988_duration18.051.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
  Duration: 00:00:18.19, start: 0.000000, bitrate: 1044 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280 [SAR 1:1 DAR 9:16], 923 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 112 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

    any ideas whats wrong? both videos play perfect separately after processing but not after the concat

  • How to put bat into wmv? [closed]

    18 April, by Dead_TheRay

    Like open some folder after opening it file

    start explorer.exe

    or something, idk.

    Maybe i can do it with ffmpeg? Or something else?

    Don't ask why i want it lol :D

    I don't want change it question,

    I JUST WANT PUT BAT INTO WMV FILE.

    uhm. It question don't need changes cause i write all what i want!

  • OpusError while using ffmpeg library in discord.py

    18 April, by The Assignment Nerd

    While playing a local file or youtube audio, I get OpusError: invalid argument error

    The play command looks like:

    # bot.py
import os
import discord
from discord.ext import commands
from dotenv import load_dotenv
from models import *
from discord.voice_client import VoiceClient
import logging
from config import *
import youtube_dl
from youtube_dl import YoutubeDL

@bot.command()
async def play(ctx):
    user=ctx.author
    voice_channel=user.voice.channel
    channel=None
    # only play music if user is in a voice channel
    if voice_channel:
        # grab user's voice channel
        channel=voice_channel.name
        await ctx.send('User is in channel: '+ channel)
        # create StreamPlayer
        vc = await voice_channel.connect()
        url="https://www.youtube.com/watch?v=AOeY-nDp7hI"
        YDL_OPTIONS = {'format': 'bestaudio', 'noplaylist':'True'}
        FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
        voice = discord.utils.get(bot.voice_clients, guild=ctx.guild)
        print(0)
        if not voice.is_playing():
            print("1")
            with YoutubeDL(YDL_OPTIONS) as ydl:
                info = ydl.extract_info(url, download=False)
                print(2)
            URL = info['formats'][0]['url']
            print(3)
            voice.play(discord.FFmpegPCMAudio(URL, **FFMPEG_OPTIONS))
            print(4)
            voice.is_playing()
            print("Strated playing")
        else:
            await ctx.send("Already playing song")
            return
    else:
        await ctx.send('User is not in a channel.')

    My error:

    0
1
[youtube] AOeY-nDp7hI: Downloading webpage
[youtube] Downloading just video AOeY-nDp7hI because of --no-playlist
2
3
Ignoring exception in command play:
Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.9/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "/Users/mohit/programming/discord/area-51-helper/main.py", line 115, in play
    voice.play(discord.FFmpegPCMAudio(URL, **FFMPEG_OPTIONS))
  File "/opt/homebrew/lib/python3.9/site-packages/discord/voice_client.py", line 564, in play
    self.encoder = opus.Encoder()
  File "/opt/homebrew/lib/python3.9/site-packages/discord/opus.py", line 291, in __init__
    self.set_fec(True)
  File "/opt/homebrew/lib/python3.9/site-packages/discord/opus.py", line 326, in set_fec
    _lib.opus_encoder_ctl(self._state, CTL_SET_FEC, 1 if enabled else 0)
  File "/opt/homebrew/lib/python3.9/site-packages/discord/opus.py", line 92, in _err_lt
    raise OpusError(result)
discord.opus.OpusError: invalid argument

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.9/site-packages/discord/ext/commands/bot.py", line 939, in invoke
    await ctx.command.invoke(ctx)
  File "/opt/homebrew/lib/python3.9/site-packages/discord/ext/commands/core.py", line 863, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/discord/ext/commands/core.py", line 94, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: OpusError: invalid argument

    I'm using these version

    discord.py==1.0.1
ffmpeg==4.3.2
youtube_dl==2021.4.17

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