[Libav-user] Fill AVFrame from a Cairo surface
Paul B Mahol
onemda at gmail.com
Thu Aug 26 20:46:07 EEST 2021
On Thu, Aug 26, 2021 at 6:59 PM Colossus <colossus73 at gmail.com> wrote:
> No more replies? Still on vacations?
>
> What's the point to release a good C library to handle videos
> and don't write a fuck of documentation?
>
There is documentation and multitude of projects successfully using it.
Your behavior will get you nowhere.
>
> On Wed, 18 Aug 2021 at 13:17, Colossus <colossus73 at gmail.com> wrote:
>
>> Ok, I reordered the code. I don't get anymore the annoying message
>> 'input picture width greater than stride' but I get a crash in memalloc()
>> called
>> by av_send_frame().
>>
>> *This is the gdb output:*
>> Thread 1 "imagination" received signal SIGABRT, Aborted.
>> __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
>> 50 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
>> (gdb) bt
>> #0 __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
>> #1 0x00007ffff5518537 in __GI_abort () at abort.c:79
>> #2 0x00007ffff5571768 in __libc_message (action=action at entry=do_abort,
>> fmt=fmt at entry=0x7ffff567fe2d "%s\n")
>> at ../sysdeps/posix/libc_fatal.c:155
>> #3 0x00007ffff5578a5a in malloc_printerr (str=str at entry=0x7ffff5682110
>> "malloc_consolidate(): invalid chunk size")
>> at malloc.c:5347
>> #4 0x00007ffff5579918 in malloc_consolidate (av=av at entry=0x7ffff56b1b80
>> <main_arena>) at malloc.c:4477
>> #5 0x00007ffff557b755 in _int_malloc (av=av at entry=0x7ffff56b1b80
>> <main_arena>, bytes=bytes at entry=16288) at malloc.c:3699
>> #6 0x00007ffff557c4af in _int_memalign
>> (av=av at entry=0x7ffff56b1b80 <main_arena>, alignment=alignment at entry=64,
>> bytes=bytes at entry=16176) at malloc.c:4684
>> #7 0x00007ffff557d55c in _mid_memalign (alignment=64, bytes=16176,
>> address=<optimized out>) at malloc.c:3312
>> #8 0x00007ffff1e9fb2a in x264_malloc () at
>> /lib/x86_64-linux-gnu/libx264.so.160
>> #9 0x00007ffff1eba75c in () at /lib/x86_64-linux-gnu/libx264.so.160
>> #10 0x00007ffff1ebe6b0 in () at /lib/x86_64-linux-gnu/libx264.so.160
>> #11 0x00007ffff1f27957 in () at /lib/x86_64-linux-gnu/libx264.so.160
>> #12 0x00007ffff1ea4aa1 in x264_encoder_encode () at
>> /lib/x86_64-linux-gnu/libx264.so.160
>> #13 0x00007ffff62df6d8 in () at /lib/x86_64-linux-gnu/libavcodec.so.58
>> #14 0x00007ffff6094c37 in avcodec_encode_video2 () at
>> /lib/x86_64-linux-gnu/libavcodec.so.58
>> #15 0x00007ffff6095012 in () at /lib/x86_64-linux-gnu/libavcodec.so.58
>> #16 0x00007ffff609519f in *avcodec_send_frame* () at
>> /lib/x86_64-linux-gnu/libavcodec.so.58
>> #17 0x000055555557aaae in img_export_encode_av_frame
>> (pkt=0x5555556e6d60, ctx=0x55555643cb40, fmt=0x5555564859c0,
>> frame=<optimized out>) at export.c:968
>>
>> And this is the code:
>> static gboolean img_export_frame_to_avframe(img_window_struct *img,
>> cairo_surface_t *surface)
>> {
>> static gint i = 0;
>>
>> gint width, height, stride, row, col, offset, ret;
>> uint8_t *pix, *data;
>> AVFrame *frame;
>>
>> /* Image info and pixel data */
>> width = cairo_image_surface_get_width( surface );
>> height = cairo_image_surface_get_height( surface );
>> stride = cairo_image_surface_get_stride( surface );
>> pix = cairo_image_surface_get_data( surface );
>>
>> /* Initialize AVFrame to be sent to the encoder */
>> frame = av_frame_alloc();
>> frame->format = img->codec_context->pix_fmt;
>> frame->width = img->video_size[0];
>> frame->height = img->video_size[1];
>> av_frame_get_buffer(frame, 32);
>>
>> /* Fill the frame data with pixels from the Cairo surface */
>> for( row = 0; row < height; row++ )
>> {
>> data = pix + row * stride;
>> for( col = 0; col < width; col++ )
>> {
>> frame->data[0][row * frame->linesize[0] + col] = data[2];
>> frame->data[1][row * frame->linesize[1] + col] = data[1];
>> frame->data[2][row * frame->linesize[2] + col] = data[0];
>> data += 4;
>> }
>> frame->pts = i;
>> i++;
>> }
>> //sws_scale(img->sws_ctx, pix, img->video_frame->linesize, 0,
>> img->video_frame->height, img->video_frame->data, sws_frame->linesize);
>>
>> ret = img_export_encode_av_frame(frame, img->video_format_context,
>> img->codec_context, &img->video_packet);
>>
>> if (frame)
>> {
>> av_frame_free(&frame);
>> frame = NULL;
>> }
>> return ret;
>> }
>>
>> gboolean img_export_encode_av_frame(AVFrame *frame, AVFormatContext *fmt,
>> AVCodecContext *ctx, AVPacket *pkt)
>> {
>> gint ret;
>>
>> /* send the frame to the encoder */
>> ret = *avcodec_send_frame*(ctx, frame);
>> if (ret < 0)
>> {
>> g_print("Av error: %s\n",av_err2str(ret));
>> g_print("Error sending a frame for encoding\n");
>> return FALSE;
>> }
>> while (ret >= 0)
>> {
>> ret = avcodec_receive_packet(ctx, pkt);
>> if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
>> return TRUE;
>> else if (ret < 0)
>> g_print("Error during encoding\n");
>>
>> av_interleaved_write_frame(fmt, pkt);
>> av_packet_unref(pkt);
>> return FALSE;
>> }
>> return TRUE;
>> }
>>
>> What can be the cause of the crash now?
>>
>> Thanks
>>
>> On Mon, 16 Aug 2021 at 16:35, Nicolas George <george at nsup.org> wrote:
>>
>>> Colossus (12021-08-16):
>>> > I told you I did and avcodec_send_frame() is the one that throws that
>>> error.
>>>
>>> I will trust the code I see. Re-post your code once you have fixed the
>>> order of the function calls and checked all the return values properly,
>>> if it still does not work.
>>>
>>> --
>>> Nicolas George
>>> _______________________________________________
>>> Libav-user mailing list
>>> Libav-user at ffmpeg.org
>>> https://ffmpeg.org/mailman/listinfo/libav-user
>>>
>>> To unsubscribe, visit link above, or email
>>> libav-user-request at ffmpeg.org with subject "unsubscribe".
>>>
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