codec

问题 We have some files encoded in AV1, but we recently noticed that Chrome mobile fails to play the files - but it doesn't fall back to an encoding it can use - it just puts the unplayable AV1 file in there. I'm hoping that if we add a codec attribute we can remedy this - but I'm not sure how to determine the codec for these AV1 files. I've come across this documentation on MDN, but I'm not sure how I would determine the proper codec from that. It starts off simple enough, but some of the values

问题 How can I convert a video from H.264 (High 4:4:4 Profile) to H.264 (Main Profile) using ffmpeg? I can't do that with this command: ffmpeg -i 1/25359.mp4 -profile:v main out.mp4 . That'd return an error: ... That'd return an error: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1/25359.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf56.40.101 Duration: 00:00:06.08, start: 0.000000, bitrate: 1059 kb/s Stream #0:0(und): Video: h264 (High 4:4:4

问题 Is it possible to use an input variable as a Method's Class Name? What I'm using now: Switch / Case with multiple Namespace.Class.Method() 's. Each Codec Method is in its own Class. public static void SetControls(string codec_SelectedItem) { switch (codec_SelectedItem) { case "Vorbis": Codec.Vorbis.Set(); break; case "Opus": Codec.Opus.Set(); break; case "AAC": Codec.AAC.Set(); break; case "FLAC": Codec.FLAC.Set(); break; case "PCM": Codec.PCM.Set(); break; } } Trying to simplify: A single

问题 In my use-case I have to provide codec specification within the HTML5 video source 's MIME type. But even a type="video/mp4; codecs=avc1" is not detailed enough for Firefox. Firefox needs the extra detail of for example type="video/mp4; codecs=avc1.64001E" . My problem is that I don't know where to get this 64001E part from. The whole identification happens on server side. So far I was using ffprobe and that's perfectly supplies me JSON format output, like so: ffprobe -select_streams v:0 -v

问题 n00b here (first Android project). I have been given a custom video codec that has been integrated with an Android firmware build. It's an .so file containing a class that inherits from MediaPlayerInterface, as well as a custom MediaPlayerService implementation to return instances of the custom codec class from the create() factory function for the appropriate file types. I want to use this codec as part of a video player application that can be installed on phones that do not contain the

问题 n00b here (first Android project). I have been given a custom video codec that has been integrated with an Android firmware build. It's an .so file containing a class that inherits from MediaPlayerInterface, as well as a custom MediaPlayerService implementation to return instances of the custom codec class from the create() factory function for the appropriate file types. I want to use this codec as part of a video player application that can be installed on phones that do not contain the

问题 This program does not play videos but the sound is okey. I get an error about h264 or MJPG.When trying to play an .mp4 or .avi file I see the this messages. main decoder error: Codec `MJPG' (Motion JPEG Video) is not supported. main decoder error: Codec not supported main decoder error: VLC could not decode the format "MJPG" (Motion JPEG Video) or main decoder error:Codec `h264' (H264 - MPEG-4 AVC (part 10)) is not supported. main decoder error: Codec not supported main decoder error: VLC

问题 I am trying to play *.avi file (~900MB) with this code: QMediaPlayer* player = new QMediaPlayer(this); player->setMedia(QUrl::fromLocalFile("mes1.avi")); player->setVideoOutput(ui->videoWidget); player->play(); where ui->videoWidget is QVideoWidget and every time I play it I am getting this error code (in Application Output console) Since google doesn't help, this is my only choice... DirectShowPlayerService::doRender: Unresolved error code 0x80040266 (IDispatch error #102) EDIT1: I have

问题 I need to read OPUS packets one by one from ogg/opus file and send them further in OPUS format so without decoding. I'm looking at opusfile lib but API and examples are rather complicated and more focused on decoding the file and getting resulted PCM. Is there a way to achieve what I want with this lib and how? If not what other options do I have? 回答1: libogg could be used to parse the Ogg Opus file's "pages", and then the opus "packets" could then be extracted from those pages. Mind that

问题 I need to create a reader from buffer(that is wav bytes ) in order to do it I am using such approach: void co_AudioEncoderMF::load_from_memory(unsigned char const * data, long data_size) { unsigned char * buf = new unsigned char[data_size]; //JUST FOR TEST IN ORDER TO BE SURE THAT I HAVE THIS DATA memcpy(buf, data, data_size); IMFMediaType *input_type = nullptr; IMFSourceReader *source_reader = nullptr; IMFMediaType *ouput_media_type = nullptr; IMFSinkWriter *sink_writer = nullptr; IStream *