amv320*240视频
时间: 2023-09-19 17:02:00 浏览: 73
AMV320*240视频是一种视频格式,其分辨率为320*240像素。这种视频格式在过去常用于低端便携式媒体设备(如MP3/MP4播放器)中播放视频。由于分辨率较低,画面质量相对较差,但在当时它是一种流行的视频格式。
AMV320*240视频通常以AMV(AMV格式的视频文件)的方式存储,其采用自己的压缩算法来减小文件体积。它可以通过将其他常见的视频格式(如AVI、MP4)转换为AMV格式,来在支持该格式的设备上播放视频。
然而,随着科技的不断进步,AMV320*240视频已逐渐落后于更高分辨率的视频格式。现在,高清(HD)视频已普遍流行,例如1080p(1920*1080像素)或更高分辨率的视频。这些高分辨率视频在大屏幕上播放时能够呈现更加清晰、细腻的画面,提供更好的观影体验。
总的来说,AMV320*240视频是一种过去常用的低分辨率视频格式,适用于较小的屏幕和低端媒体设备。然而,随着科技的发展,更高分辨率的视频格式已经取代了它,使观影体验更加优秀。
相关问题
AMV8的AEs指令有哪些?
AMV8是一种视频编辑软件,AEs指令是其提供的一些常用指令,用于实现视频编辑和特效制作。以下是一些常见的AMV8的AEs指令:
1. `Opacity`:控制图层的透明度。
2. `Position`:控制图层在画面中的位置。
3. `Scale`:控制图层的缩放比例。
4. `Rotation`:控制图层的旋转角度。
5. `Anchor Point`:控制图层的锚点位置,影响旋转和缩放的中心点。
6. `Mask`:创建遮罩效果,用于控制图层的可见区域。
7. `Keyframe`:设置关键帧,用于控制图层属性在时间轴上的变化。
8. `Effects`:应用各种特效效果,如模糊、颜色调整、光影等。
9. `Transitions`:添加过渡效果,实现场景切换或图层之间的平滑过渡。
10. `Text Animation`:创建文字动画效果,包括字体、大小、颜色、运动等。
这些指令可以通过在时间轴上设置关键帧和调整参数来实现各种视频编辑和特效效果。
C#H264转BMP
根据提供的引用内容,您可以使用FFmpeg API在C#中编写程序,以实现将H264关键帧转换为BMP的功能。以下是大致的流程原理:
1.使用FFmpeg API解复用mp4文件,得到一个视频流。
2.将视频流解码为yuv序列。
3.将yuv序列中指定的一帧图片内容转换为rgb。
4.将rgb数据存储为bmp位图。
以下是一个C#的示例代码:
```csharp
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
namespace H264ToBmp
{
class Program
{
static void Main(string[] args)
{
// 初始化FFmpeg
FFmpeg.av_register_all();
FFmpeg.avcodec_register_all();
// 打开输入文件
string inputFileName = "input.mp4";
AVFormatContext* inputFormatContext = null;
if (FFmpeg.avformat_open_input(&inputFormatContext, inputFileName, null, null) != 0)
{
Console.WriteLine("无法打开输入文件");
return;
}
// 查找视频流
int videoStreamIndex = -1;
for (int i = 0; i < inputFormatContext->nb_streams; i++)
{
if (inputFormatContext->streams[i]->codecpar->codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
{
videoStreamIndex = i;
break;
}
}
if (videoStreamIndex == -1)
{
Console.WriteLine("无法找到视频流");
return;
}
// 打开视频解码器
AVCodec* videoCodec = FFmpeg.avcodec_find_decoder(inputFormatContext->streams[videoStreamIndex]->codecpar->codec_id);
if (videoCodec == null)
{
Console.WriteLine("无法找到视频解码器");
return;
}
AVCodecContext* videoCodecContext = FFmpeg.avcodec_alloc_context3(videoCodec);
if (FFmpeg.avcodec_parameters_to_context(videoCodecContext, inputFormatContext->streams[videoStreamIndex]->codecpar) < 0)
{
Console.WriteLine("无法初始化视频解码器上下文");
return;
}
if (FFmpeg.avcodec_open2(videoCodecContext, videoCodec, null) < 0)
{
Console.WriteLine("无法打开视频解码器");
return;
}
// 查找关键帧
AVPacket packet = new AVPacket();
AVFrame* frame = FFmpeg.av_frame_alloc();
int gotPicture = 0;
while (FFmpeg.av_read_frame(inputFormatContext, &packet) >= 0)
{
if (packet.stream_index == videoStreamIndex)
{
if (FFmpeg.avcodec_decode_video2(videoCodecContext, frame, &gotPicture, &packet) < 0)
{
Console.WriteLine("无法解码视频帧");
return;
}
if (gotPicture != 0 && (frame->key_frame != 0 || frame->pict_type == AVPictureType.AV_PICTURE_TYPE_I))
{
break;
}
}
FFmpeg.av_packet_unref(&packet);
}
// 将yuv序列转换为rgb
SwsContext* swsContext = FFmpeg.sws_getContext(videoCodecContext->width, videoCodecContext->height, videoCodecContext->pix_fmt,
videoCodecContext->width, videoCodecContext->height, AVPixelFormat.AV_PIX_FMT_RGB24, 0, null, null, null);
AVFrame* rgbFrame = FFmpeg.av_frame_alloc();
byte_ptrArray4 rgbData = new byte_ptrArray4();
int rgbDataSize = FFmpeg.av_image_alloc(rgbData, null, videoCodecContext->width, videoCodecContext->height, AVPixelFormat.AV_PIX_FMT_RGB24, 1);
FFmpeg.sws_scale(swsContext, frame->data, frame->linesize, 0, videoCodecContext->height, rgbData, rgbFrame->linesize);
// 将rgb数据存储为bmp位图
Bitmap bmp = new Bitmap(videoCodecContext->width, videoCodecContext->height, videoCodecContext->width * 3, PixelFormat.Format24bppRgb, new IntPtr(rgbData[0]));
bmp.Save("output.bmp", ImageFormat.Bmp);
// 释放资源
FFmpeg.avformat_close_input(&inputFormatContext);
FFmpeg.avcodec_free_context(&videoCodecContext);
FFmpeg.av_frame_free(&frame);
FFmpeg.sws_freeContext(swsContext);
FFmpeg.av_frame_free(&rgbFrame);
FFmpeg.av_freep(&rgbData[0]);
}
}
public unsafe static class FFmpeg
{
private const string DllName = "ffmpeg.dll";
[DllImport(DllName)]
public static extern void av_register_all();
[DllImport(DllName)]
public static extern void avcodec_register_all();
[DllImport(DllName)]
public static extern int avformat_open_input(AVFormatContext** ps, string url, AVInputFormat* fmt, AVDictionary** options);
[DllImport(DllName)]
public static extern int avcodec_decode_video2(AVCodecContext* avctx, AVFrame* picture, int* got_picture_ptr, AVPacket* avpkt);
[DllImport(DllName)]
public static extern AVCodec* avcodec_find_decoder(AVCodecID id);
[DllImport(DllName)]
public static extern AVCodecContext* avcodec_alloc_context3(AVCodec* codec);
[DllImport(DllName)]
public static extern int avcodec_parameters_to_context(AVCodecContext* codec, AVCodecParameters* par);
[DllImport(DllName)]
public static extern int avcodec_open2(AVCodecContext* avctx, AVCodec* codec, AVDictionary** options);
[DllImport(DllName)]
public static extern int av_read_frame(AVFormatContext* s, AVPacket* pkt);
[DllImport(DllName)]
public static extern void av_packet_unref(AVPacket* pkt);
[DllImport(DllName)]
public static extern AVFrame* av_frame_alloc();
[DllImport(DllName)]
public static extern SwsContext* sws_getContext(int srcW, int srcH, AVPixelFormat srcFormat,
int dstW, int dstH, AVPixelFormat dstFormat, int flags, SwsFilter* srcFilter, SwsFilter* dstFilter, double* param);
[DllImport(DllName)]
public static extern int av_image_alloc(byte_ptrArray4 pointers, int_array4 linesizes, int w, int h, AVPixelFormat pix_fmt, int align);
[DllImport(DllName)]
public static extern void sws_scale(SwsContext* c, byte_ptrArray4 srcSlice, int_array4 srcStride,
int srcSliceY, int srcSliceH, byte_ptrArray4 dst, int_array4 dstStride);
[DllImport(DllName)]
public static extern void sws_freeContext(SwsContext* swsContext);
[DllImport(DllName)]
public static extern void av_frame_free(AVFrame** frame);
[DllImport(DllName)]
public static extern void avcodec_free_context(AVCodecContext** avctx);
[DllImport(DllName)]
public static extern void avformat_close_input(AVFormatContext** s);
[DllImport(DllName)]
public static extern void av_freep(void* ptr);
}
public enum AVMediaType
{
AVMEDIA_TYPE_UNKNOWN = -1,
AVMEDIA_TYPE_VIDEO,
AVMEDIA_TYPE_AUDIO,
AVMEDIA_TYPE_DATA,
AVMEDIA_TYPE_SUBTITLE,
AVMEDIA_TYPE_ATTACHMENT,
AVMEDIA_TYPE_NB
}
public enum AVCodecID
{
AV_CODEC_ID_NONE,
/* video codecs */
AV_CODEC_ID_MPEG1VIDEO,
AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
AV_CODEC_ID_H261,
AV_CODEC_ID_H263,
AV_CODEC_ID_RV10,
AV_CODEC_ID_RV20,
AV_CODEC_ID_MJPEG,
AV_CODEC_ID_MJPEGB,
AV_CODEC_ID_LJPEG,
AV_CODEC_ID_SP5X,
AV_CODEC_ID_JPEGLS,
AV_CODEC_ID_MPEG4,
AV_CODEC_ID_RAWVIDEO,
AV_CODEC_ID_MSMPEG4V1,
AV_CODEC_ID_MSMPEG4V2,
AV_CODEC_ID_MSMPEG4V3,
AV_CODEC_ID_WMV1,
AV_CODEC_ID_WMV2,
AV_CODEC_ID_H263P,
AV_CODEC_ID_H263I,
AV_CODEC_ID_FLV1,
AV_CODEC_ID_SVQ1,
AV_CODEC_ID_SVQ3,
AV_CODEC_ID_DVVIDEO,
AV_CODEC_ID_HUFFYUV,
AV_CODEC_ID_CYUV,
AV_CODEC_ID_H264,
AV_CODEC_ID_INDEO3,
AV_CODEC_ID_VP3,
AV_CODEC_ID_THEORA,
AV_CODEC_ID_ASV1,
AV_CODEC_ID_ASV2,
AV_CODEC_ID_FFV1,
AV_CODEC_ID_4XM,
AV_CODEC_ID_VCR1,
AV_CODEC_ID_CLJR,
AV_CODEC_ID_MDEC,
AV_CODEC_ID_ROQ,
AV_CODEC_ID_INTERPLAY_VIDEO,
AV_CODEC_ID_XAN_WC3,
AV_CODEC_ID_XAN_WC4,
AV_CODEC_ID_RPZA,
AV_CODEC_ID_CINEPAK,
AV_CODEC_ID_WS_VQA,
AV_CODEC_ID_MSRLE,
AV_CODEC_ID_MSVIDEO1,
AV_CODEC_ID_IDCIN,
AV_CODEC_ID_8BPS,
AV_CODEC_ID_SMC,
AV_CODEC_ID_FLIC,
AV_CODEC_ID_TRUEMOTION1,
AV_CODEC_ID_VMDVIDEO,
AV_CODEC_ID_MSZH,
AV_CODEC_ID_ZLIB,
AV_CODEC_ID_QTRLE,
AV_CODEC_ID_TSCC,
AV_CODEC_ID_ULTI,
AV_CODEC_ID_QDRAW,
AV_CODEC_ID_VIXL,
AV_CODEC_ID_QPEG,
AV_CODEC_ID_PNG,
AV_CODEC_ID_PPM,
AV_CODEC_ID_PBM,
AV_CODEC_ID_PGM,
AV_CODEC_ID_PGMYUV,
AV_CODEC_ID_PAM,
AV_CODEC_ID_FFVHUFF,
AV_CODEC_ID_RV30,
AV_CODEC_ID_RV40,
AV_CODEC_ID_VC1,
AV_CODEC_ID_WMV3,
AV_CODEC_ID_LOCO,
AV_CODEC_ID_WNV1,
AV_CODEC_ID_AASC,
AV_CODEC_ID_INDEO2,
AV_CODEC_ID_FRAPS,
AV_CODEC_ID_TRUEMOTION2,
AV_CODEC_ID_BMP,
AV_CODEC_ID_CSCD,
AV_CODEC_ID_MMVIDEO,
AV_CODEC_ID_ZMBV,
AV_CODEC_ID_AVS,
AV_CODEC_ID_SMACKVIDEO,
AV_CODEC_ID_NUV,
AV_CODEC_ID_KMVC,
AV_CODEC_ID_FLASHSV,
AV_CODEC_ID_CAVS,
AV_CODEC_ID_JPEG2000,
AV_CODEC_ID_VMNC,
AV_CODEC_ID_VP5,
AV_CODEC_ID_VP6,
AV_CODEC_ID_VP6F,
AV_CODEC_ID_TARGA,
AV_CODEC_ID_DSICINVIDEO,
AV_CODEC_ID_TIERTEXSEQVIDEO,
AV_CODEC_ID_TIFF,
AV_CODEC_ID_GIF,
AV_CODEC_ID_DXA,
AV_CODEC_ID_DNXHD,
AV_CODEC_ID_THP,
AV_CODEC_ID_SGI,
AV_CODEC_ID_C93,
AV_CODEC_ID_BETHSOFTVID,
AV_CODEC_ID_PTX,
AV_CODEC_ID_TXD,
AV_CODEC_ID_VP6A,
AV_CODEC_ID_AMV,
AV_CODEC_ID_VB,
AV_CODEC_ID_PCX,
AV_CODEC_ID_SUNRAST,
AV_CODEC_ID_INDEO4,
AV_CODEC_ID_INDEO5,
AV_CODEC_ID_MIMIC,
AV_CODEC_ID_RL2,
AV_CODEC_ID_ESCAPE124,
AV_CODEC_ID_DIRAC,
AV_CODEC_ID_BFI,
AV_CODEC_ID_CMV,
AV_CODEC_ID_MOTIONPIXELS,
AV_CODEC_ID_TGV,
AV_CODEC_ID_TGQ,
AV_CODEC_ID_TQI,
AV_CODEC_ID_AURA,
AV_CODEC_ID_AURA2,
AV_CODEC_ID_V210X,
AV_CODEC_ID_TMV,
AV_CODEC_ID_V210,
AV_CODEC_ID_DPX,
AV_CODEC_ID_MAD,
AV_CODEC_ID_FRWU,
AV_CODEC_ID_FLASHSV2,
AV_CODEC_ID_CDGRAPHICS,
AV_CODEC_ID_R210,
AV_CODEC_ID_ANM,
AV_CODEC_ID_BINKVIDEO,
AV_CODEC_ID_IFF_ILBM,
AV_CODEC_ID_IFF_BYTERUN1,
AV_CODEC_ID_KGV1,
AV_CODEC_ID_YOP,
AV_CODEC_ID_VP8,
AV_CODEC_ID_PICTOR,
AV_CODEC_ID_ANSI,
AV_CODEC_ID_A64_MULTI,
AV_CODEC_ID_A64_MULTI5,
AV_CODEC_ID_R10K,
AV_CODEC_ID_MXPEG,
AV_CODEC_ID_LAGARITH,
AV_CODEC_ID_PRORES,
AV_CODEC_ID_JV,
AV_CODEC_ID_DFA,
AV_CODEC_ID_WMV3IMAGE,
AV_CODEC_ID_VC1IMAGE,
AV_CODEC_ID_UTVIDEO,
AV_CODEC_ID_BMV_VIDEO,
AV_CODEC_ID_VBLE,
AV_CODEC_ID_DXTORY,
AV_CODEC_ID_V410,
AV_CODEC_ID_XWD,
AV_CODEC_ID_CDXL,
AV_CODEC_ID_XBM,
AV_CODEC_ID_ZEROCODEC,
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