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• Why after rendering with ffmpeg, file size did not decrease ?

  15 avril 2021, par ptrra

  PROBLEM : After rendering a certain video with ffmpeg file size increased from 4GB to 6GB.
  
ORIGINAL VIDEO : EE1.mkv
  
FFMPEG COMMAND : ffmpeg -i EE1.mkv -c:a copy -c:v libx264 -crf 23 -preset medium -profile:v high out.mp4
  
QUESTIONS : Why did the file size increase ? What am I doing wrong ?

  


   !DETAILS !
  
After a few years I made about 30 gaming videos (130GB) and with the current covid-19 situation I started recording my online classes (about 40 videos or 150GB). Now because I'm lacking space on my 1TB external HDD I started getting into ffmpeg. Before I was only using obs-studio and not good parameters for recording.

  


  I was using CBR mode for recording, either 5000KB or 15000KB bit rate with varying x264 presets and profiles because I was also experimenting with them. Usually superfast preset with high profile. So I wanted to convert all those videos with ffmpeg using CRF 23, medium preset and high profile. A note that when I'm recording with obs-studio it's set to record in matroska format (.mkv).

  


  When I was rendering my online classes videos with these settings I managed to achieve 10x better compression with the same quality. And when rendering my gaming videos I managed to achieve up to 3x better compression with the same quality. However there is this one video that when rendered with the same parameters the file size increases.

  


  The EE1.mkv should be recorded with CBR 15000KB bit rate, with superfast preset and high profile. Also the game that is recorded in this video is Empire Earth which needs around 8000KB for it to look good. Everything more than 8000KB is not needed.

  


  Thank you all for your help.

  


• FFmpeg codec internal error with my decoder

  10 juillet 2023, par StevenSun

  `Hey, I write a ffmpeg codec based on openmax. It can run success with my test code or ffmpeg test. However it run with error when I use it in chrome.
The error is
[3845:3880:0710/110530.508867:ERROR:ffmpeg_video_decoder.cc(487)] avcodec_open2 failed.-558323010
[3845:3880:0710/110530.509921:ERROR:ffmpeg_video_decoder.cc(491)] avcodec_open2 error : Internal bug, should not have happened

  


  now I am confused with open the ffmpeg logging in chrome , so I can't resolve this problem.

  


  The following is my codec settings :

  


  #define OFFSET(x) offsetof(OMXCodecDecoderContext, x)
#define VDE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM
#define VE  AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
#define VD  AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

static const AVOption options[] = {
    { "omx_libname", "OpenMAX library name", OFFSET(libname), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VDE },
    { "omx_libprefix", "OpenMAX library prefix", OFFSET(libprefix), AV_OPT_TYPE_STRING, { 0 }, 0, 0, VDE },   
    { "profile",  "Set the Decoding profile", OFFSET(profile), AV_OPT_TYPE_INT,   { .i64 = FF_PROFILE_UNKNOWN },       FF_PROFILE_UNKNOWN, FF_PROFILE_H264_HIGH, VE, "profile" },
    { "baseline", "",                         0,               AV_OPT_TYPE_CONST, { .i64 = FF_PROFILE_H264_BASELINE }, 0, 0, VE, "profile" },
    { "main",     "",                         0,               AV_OPT_TYPE_CONST, { .i64 = FF_PROFILE_H264_MAIN },     0, 0, VE, "profile" },
    { "high",     "",                         0,               AV_OPT_TYPE_CONST, { .i64 = FF_PROFILE_H264_HIGH },     0, 0, VE, "profile" },
    { NULL }
};


static const AVCodecHWConfigInternal *const omx_hw_configs[] = {
    &(const AVCodecHWConfigInternal) {
        .public          = {
            .pix_fmt     = AV_PIX_FMT_NV12,
            .methods     = AV_CODEC_HW_CONFIG_METHOD_AD_HOC |
                           AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX,
            .device_type = AV_HWDEVICE_TYPE_MEDIACODEC,
        },
        .hwaccel         = NULL,
    },
    NULL
};


static const AVOption ff_omxcodec_vdec_options[] = {
    { "delay_flush", "Delay flush until hw output buffers are returned to the decoder",
                     OFFSET(delay_flush), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, VD },
    { NULL }
};

#define DECLARE_OMX_VCLASS(short_name)                          \
static const AVClass ff_##short_name##_omxcodec_dec_class = {   \
    .class_name = #short_name "_libomxh264",                    \
    .item_name  = av_default_item_name,                         \
    .option     = ff_omxcodec_vdec_options,                     \
    .version    = LIBAVUTIL_VERSION_INT,                        \
};

#define DECLARE_OMX_VDEC(short_name, full_name, codec_id, bsf)                          \
DECLARE_OMX_VCLASS(short_name)                                                          \
const FFCodec ff_ ## short_name ## _omx_decoder = {                                     \
    .p.name         = #short_name "_omxcodec",                             \
    CODEC_LONG_NAME(full_name " OpenMAX IL decoder"),                      \
    .p.type         = AVMEDIA_TYPE_VIDEO,                                  \
    .p.id           = codec_id,                                            \
    .p.priv_class   = &ff_##short_name##_omxcodec_dec_class,               \
    .priv_data_size = sizeof(OMXCodecDecoderContext),                      \
    .init           = omx_decode_init,                                     \
    FF_CODEC_DECODE_CB(omx_decode_frame),                                  \
    .close          = omx_decode_end,                                      \
    .flush          = omx_decode_flush,                                    \
    .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AVOID_PROBING | AV_CODEC_CAP_HARDWARE, \
    .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE |                                       \
                      FF_CODEC_CAP_SETS_PKT_DTS,                                               \
    .bsfs           = bsf,                                                                     \
    .hw_configs     = omx_hw_configs,                                                          \
    .p.wrapper_name = "omxcodec",                                                              \
}; 

DECLARE_OMX_VDEC(h264,  "H.264", AV_CODEC_ID_H264, "h264_mp4toannexb")
DECLARE_OMX_VDEC(hevc,  "H.265", AV_CODEC_ID_HEVC, "hevc_mp4toannexb")
DECLARE_OMX_VDEC(mpeg4, "MPEG-4", AV_CODEC_ID_MPEG4, NULL)


  


  can someone give me a advice to resolve this problem ?

  


• FFMPEG is not able to find window for edge browser

  19 avril 2022, par randy

  I am trying to capture video recording for edge browser using below command

  


  ffmpeg.exe -f gdigrab -framerate 9 -i title="About version - Profile 1 - Microsoft​ Edge' -vcodec libx264 -threads 1 -crf 35 -preset ultrafast -f hls -g 15 -hls_list_size 0 -hls_time 5 -r 7 -pix_fmt yuv420p -maxrate 1.7M -bufsize 2M -tune zerolatency -vf pad=ceil(iw/2)*2:ceil(ih/2)*2 index.m3u8


  


  This is how I found title for edge browser

  


  tasklist /v /fi "imagename eq msedge.exe" /fo list


  


  This is the error I get (notice the weird character)

  


   Can't find window 'About version - Profile 1 - MicrosoftΓÇï Edge'


  


  I have also verified the title with AutoIt application. This is working fine for chrome and firefox. Let me know if some is able to record the edge browser via ffmpeg